Bathroom Cabinets Calculator
Spec'ing a bathroom vanity? This free bathroom cabinets calculator gives DIYers and contractors a complete vanity take-off — vanity cabinet, doors and drawers, soft-close hinges and slides, knobs and pulls, top width and depth, sink cutout per Kohler-style undermount template, faucet hole count, plumbing rough-in heights, optional linen tower, medicine cabinet (recessed or surface-mount), and framed or LED mirror — all from a single bath-type selection.
Powder room, full bathroom, and primary bath are different scopes. Powder rooms run 18–30" vanities with stock cultured-marble combos; full baths center on 30–48" with semi-custom undermount sinks; primary baths run 60–84" double vanities with linen towers and matched medicine cabinets. The calculator pre-populates each bath type with the conventional default and lets you override every input.
Built on ANSI/KCMA A161.1-2017 (same standard as kitchen — vanity cabinets share the certification), NKBA Bath Planning Guidelines (the 27 Guidelines), ICC A117.1-2017 accessibility (lavatory rim 34" max, knee/toe space, mirror height ≤ 40" AFF), IRC 2021 (R307.1 fixture clearances, P2705.1.5 double-sink spacing, R303.3 ventilation, E3901.6 GFCI), and ANSI/BHMA A156.9 hardware grades. Runs in under a minute, no signup.
Estimating cabinets for another room? Use the general cabinet calculator →
Bathroom Cabinets Calculator
Estimate vanity cabinets, doors, drawers, hinges, pulls, top size, sink cutout, plumbing rough-in, linen, medicine cabinet, mirror, and install cost — for powder rooms, full bathrooms, and primary baths.
Bath type
Sets default vanity width, depth, height, and accessory selection. All values are user-overridable below.
Full bathroom: typical width 30″–60″, default depth 21″.
Vanity dimensions
Standard widths in 6" increments. Depth 21" standard for bath; 18" in tight spaces; 24" matches kitchen-depth aesthetic.
Sink and faucet
Drives cabinet height (vessel reduces 4–7"), top cutout, and faucet hole count.
Wondering why a vessel sink needs a shorter cabinet? See the vanity-height diagram
Construction tier
Drives door style, finish quality, and lead time.
Semi-custom (KraftMaid, Schrock, Fabuwood, Bertch): 4–12 wk · Soft-close standard; many widths in 3" increments; finished plywood interiors.
Linen, medicine cabinet, and mirror
Optional bathroom storage and mirror selection — sized to the wall and stud bay.
Layout and IRC / NKBA clearance check
Optional — flags non-fatal warnings against IRC R307.1 / IPC 405.3.1 and NKBA Bath Planning Guidelines.
Not sure how much clearance code wants around the vanity and toilet? See the clearance diagram
Plumbing and removal
Existing plumbing accommodation, old vanity disposal, and floating-mount blocking.
How a vanity take-off actually works
Three things trip homeowners up when planning a bathroom vanity, and none of them is the cabinet width. These engineering-style diagrams show the clearances code wants around the vanity, why the cabinet height changes with the sink type (a vessel bowl ships a shorter box), and where the plumbing rough-in lands — including why a double vanity needs at least 60″.
The vanity-clearance plan is why the calculator checks the room around the cabinet, not just the cabinet size. Code sets minimum clear floor space in front of the lavatory and a minimum distance from a toilet centerline, and the door must not swing into the vanity, so a cabinet that fits the wall can still fail the room. Confirm the clearances before you size the box.
The height-and-sink comparison explains why the sink type, not the cabinet alone, sets the finished height. A drop-in sink rides a standard cabinet, a vessel bowl sits on a shorter one so the rim still lands in the comfort band, and an accessible lavatory caps the rim height with open knee space below. Pick the sink first; the cabinet height follows from it.
The rough-in elevation is why a double vanity needs a minimum width, not just two sinks drawn side by side. Each drain and supply set stubs out at a set height, and two sinks must keep their centerlines a minimum distance apart, so a double vanity runs sixty inches or wider. Space them closer and the faucets and traps crowd; the calculator holds the spacing.
Calculation Formulas
Maximum vanity width is the wall length minus IRC R307.1 / IPC 405.3.1 fixture clearances (15" centerline to toilet, 4" edge to wall) and any bathroom-door swing arc that intrudes on the vanity zone. Round to a standard width in 6" increments.
Example:
60" wall − 15" toilet centerline clearance − 0" wall corner − 0" door swing = 45" max; round down to 36" or 42" standard.
Standard vanity height is 30–32" (older homes); comfort/counter height is 34½–36" (current new construction default, matches kitchen). Vessel sinks reduce cabinet height by 4–7" so the finished rim still lands in the 34–36" comfort range. ADA-compliant rim ≤ 34" AFF (ICC A117.1 §606.3).
Example:
34" comfort rim − ¾" stone top = 33¼" cabinet. With a 5" vessel: 34" − ¾" − 5" = 28¼" cabinet ≈ 29" standard vessel-height base.
Standard schedule per spec §3.3. Single-sink vanities up to 60" wide are common; 60"+ trends to double-sink in primary baths. Drawer-only modern style replaces all doors with drawers (one per ~10–12" of width) — the lowest center drawer must accommodate the P-trap (manufacturer typically supplies a U-cut or removable drawer).
Example:
36" single-sink vanity → 2 doors + 1 false drawer front (above doors). 72" double-sink → 4 doors + 3 center drawers.
European 35 mm cup hinges (Blum, Salice, Hettich). Most vanity doors are 24–30" tall (2 hinges each). Tall linen-cabinet doors at 84" height typically split into two doors of ~42" each so they bump to 3 hinges.
Example:
36" vanity with 2 doors at ~28" each → 4 hinges total. Soft-close (Blum BLUMOTION 38N) is standard on semi-custom and most stock.
Per spec §4.2. Drop-in / self-rimming sinks rest their rim on the top, so the cutout is ~1" smaller than the nominal sink dimension. Undermount sinks are mounted under stone / quartz / solid-surface tops with the cutout matching bowl interior + ⅛" fabricator allowance — manufacturer templates govern (Kohler Caxton K-2210, Archer K-2355, etc.). Vessel sinks sit ON the top with only a 1¾" round drain hole. Cultured-marble combo tops have an integral bowl, no cutout.
Example:
Kohler Caxton 17" oval undermount: bowl interior 16"×13", cutout per template 1151011-7 ≈ 16⅜" × 13⅛".
Single-hole faucets concentrate spout and handles in one body; 4" centerset uses a shared deck plate; 8" widespread separates spout and handles. Wall-mount faucets put 0 holes in the top — supply lines stub out at faucet height in the wall behind.
Example:
8" widespread on a 36" vanity: 3 holes at 4" each side of sink centerline (8" spread, 1⅜" hole diameter).
Vanity tops are 1" deeper than the cabinet (front overhang). Open-end overhang is 1"; flush against a side wall it's 0". 4" backsplash matches top width; 4" side splash matches top depth where end abuts a wall.
Example:
36" cabinet × 21" deep, one open end → 37" W × 22" D top with 4"×37" backsplash and 4"×22" side splash on the wall side.
Standard residential rough-in for floor-standing vanities. Floating vanities require the drain to enter through the back wall (no floor penetration possible) at a raised height that clears drawer cutouts. Supply lines are ½" copper or PEX; drain is 1½" to wall.
Example:
32" vanity cabinet with ¾" top + drop-in sink: drain at 19" AFF, supplies at 22" AFF, supplies 4" each side of sink centerline (8" widespread).
IRC P2705.1.5 minimum sink centerline-to-centerline spacing is 30" (giving the 4" edge-to-edge minimum). NKBA recommends 36". This sets the minimum double-vanity width at 60" (giving exactly 30" CC); 72"+ gives the recommended 36" CC.
Example:
60" double = 15" and 45" centerlines (30" CC, IRC minimum). 72" = 18" and 54" (36" CC, NKBA recommended).
Per-LF vanity cost varies by tier: RTA $100–$300/LF, Stock $150–$400/LF, Semi-custom $400–$900/LF, Custom $800–$2,000+/LF — bath cabinets typically run 20–30% higher per-LF than kitchen at the same tier (smaller runs, more decorative finishes). Stock combos bundle the cabinet + integral top + bowl as one SKU. Install labor scales with vanity width and mounting type; medicine cabinets in double stud bays add reframing labor; floating vanities add blocking labor.
Example:
36" semi-custom vanity at $700/LF = $2,100 cabinet + $400 medicine cabinet + $250 reframing + $40 hardware + $500 install + $250 removal ≈ $3,540 installed.
Standard Constants
| Constant | Value | Description |
|---|---|---|
| Standard Vanity Cabinet | 21" deep × 30–32" or 34½" tall | Vanity depth standard is 21" (3" shallower than kitchen base). Standard / vanity height 30–32" (older homes); comfort / counter height 34½–36" (current new construction default — matches kitchen base). Toe kick 4" tall × 3" deep. |
| Standard Vanity Widths | 18, 24, 30, 36, 42, 48, 60, 66, 72, 84 in. | Single-sink vanities to 60"; double-sink 60"+ (most common 60, 72, 84). Less common widths (21, 27, 33, 39, 45, 54) available in semi-custom but not stock. |
| Sink Centerline Spacing (Double Vanity) | 30" min (IRC P2705.1.5); 36" recommended (NKBA) | Minimum centerline-to-centerline of two lavatories on a double vanity. This sets the minimum double-sink vanity width at 60" (30" CC); 72"+ gives the NKBA-recommended 36" CC. |
| Toilet-to-Vanity Clearance | 15" min (IRC R307.1); 18" recommended (NKBA) | Centerline of toilet to centerline of any adjacent fixture, vanity edge, or wall. Same 15" minimum applies to centerline of toilet to side wall. |
| Front Clearance at Vanity | 21" min (IRC R307.1); 30" recommended (NKBA) | Clear floor space in front of the vanity from the front edge to the opposite fixture or wall. Below 21" the vanity drawer or door cannot reasonably open. |
| Lavatory Rim Height (ADA) | 34" max AFF (ICC A117.1 §606.3) | Maximum finished rim height for ADA-compliant lavatories. Comfort-height vanities at 34½" cabinet + ¾" top = 35¼" rim are NOT ADA-compliant. ADA design typically pairs a 33¼"-max cabinet with knee-space construction (27" min H × 30" min W × 8" min D) and pipe insulation per §606.5. |
| Mirror Height (ADA) | Bottom edge ≤ 40" AFF (§603.3) | Bottom edge of any mirror over a lavatory shall not exceed 40" AFF for ADA compliance. Standard residential bath mirror placement is 4–6" above faucet (typical 38–42" AFF for a 34½" comfort vanity). |
| Bathroom GFCI Receptacle | Within 36" of lavatory edge (IRC E3901.6); all GFCI (E3902.1) | At least one GFCI receptacle within 36" of the outside edge of the lavatory. If wall placement is impossible, may be on side or face of the vanity, ≤ 12" below top of basin. All bathroom 125 V / 15-20 A receptacles must be GFCI; receptacles within 6 ft of tub/shower also GFCI (E3902.8). |
| Bathroom Ventilation | 50 cfm exhaust OR 3 sq ft window 50% operable (IRC R303.3) | Mechanical exhaust fan ≥ 50 cfm vented to outdoors (not to attic, soffit, or crawlspace) OR an operable window with at least 3 sq ft total area, 50% openable. The cabinet calculator does not include the fan — budget $150–$400 for a basic 50 cfm exhaust installed. |
| Recessed Medicine Cabinet & Stud Bay | 14–16" fits 16" o.c. bay; 20–24" needs double bay (+reframing); 30"+ multi-stud | Standard 16" o.c. wall framing gives a 14½" clear stud bay. Recessed medicine cabinets up to 14–16" wide fit a single bay; 20–24" cabinets require cutting and reinforcing one stud (~$200–$400 reframing); 30"+ tri-view cabinets require multi-stud reframing. Standard recess depth is 4" (2×4 wall + drywall) or up to 5½" in 2×6 walls. |
Note: All calculations include appropriate waste factors based on project complexity and material type. Results are estimates and should be verified by professionals before purchasing materials.
ANSI/KCMA A161.1 — Performance & Construction Standard for Kitchen and Vanity Cabinets(ANSI/KCMA A161.1-2017 (with 2022 update))
View StandardCornerstone US performance standard for residential kitchen AND vanity cabinets. The certification seal is identical for kitchen and vanity products — KCMA certifies on a single Listing Certificate. The heat/humidity test (24 hr at 120 °F / 70% RH) and detergent-edge test are particularly relevant for vanity construction because of the sustained moisture environment in bathrooms. Approximately 40-50% of manufacturers fail certification on the first attempt.
Key Requirements:
- •Wall-mount cabinet load: gradual load to 600 lb on a hung wall cabinet without failure
- •Door cycle test: 25,000 open/close cycles through 90° swing
- •Door static load: 65 lb hung on door, slowly cycled 10×
- •Drawer cycle: 25,000 cycles under load
- •Heat & humidity: 24 hr at 120 °F / 70% RH — no finish failure
- •Detergent edge: 4-24 hr exposure of door edge to standardized detergent
- •Stain resistance: vinegar, lemon, orange juice, coffee, tea, olive oil, catsup, mustard, 100-proof alcohol — no staining
NKBA Bath Planning Guidelines (the 27 Guidelines)(NKBA Kitchen & Bathroom Planning Guidelines with Access Standards (4th ed., 2022))
View StandardTwenty-seven evidence-based bathroom planning guidelines published by the National Kitchen and Bath Association. Code references in the guidelines are based on the 2015 IRC and the 2009 ICC A117.1; the 2022 4th Edition republishes them as part of an expanded planning set. Guidelines cover door/entry, fixture placement and clearance, single and double lavatory placement, vanity height, counter edges, shower size, grab bar reinforcement, toilet/bidet clearance, storage, mirror and accessory placement, electrical, lighting, ventilation, and heat.
Key Requirements:
- •Single-lavatory placement: 20" centerline to side wall (NKBA); 15" centerline / 4" edge minimum (IRC)
- •Double-lavatory placement: 36" centerline-to-centerline (NKBA); 30" minimum (IRC P2705.1.5)
- •Clear space at fixtures: 30" min from front of fixture to opposite (NKBA); 21" min (IRC R307.1)
- •Storage: adequate, accessible — 15–48" AFF reach range (Guideline 22)
- •Mirror: at user eye level (Guideline 23)
- •Electrical: GFCI at every point of use (Guideline 24)
- •Lighting: task lighting at vanity beside mirror at eye level (Guideline 25)
- •Ventilation: mechanical exhaust to outside per enclosed area (Guideline 26)
ICC A117.1 — Accessible and Usable Buildings and Facilities(ICC A117.1-2017 (Section 606 Lavatories and Sinks))
View StandardControlling US accessibility standard for bathrooms. Lavatory rim ≤ 34" AFF; clear floor space 30"×48" forward approach centered on lavatory; knee clearance 27" min H × 8" deep (extending to 11" at 9" AFF); toe clearance 17" deep when used as part of clear floor space; mirror bottom edge ≤ 40" AFF when over a lavatory (§603.3); pipe insulation/protection on supply and drain pipes under exposed knee-space lavatories (§606.5); faucet operable with one hand without tight grasping, pinching, or twisting at ≤ 5 lbf (§309.4 / §606.4).
Key Requirements:
- •Lavatory rim height: 34" max AFF
- •Lavatory clear floor space: 30" × 48" forward approach
- •Knee clearance: 27" min H × 8" deep (extends to 11" at 9" AFF) × 30" min W
- •Toe clearance: between floor and 9" AFF; 17" min deep when part of clear floor space
- •Mirror over lavatory: bottom edge ≤ 40" AFF
- •Supply and drain pipes under exposed lavatory: insulated or protected
- •Faucet: one-handed operation, ≤ 5 lbf
- •Reach ranges: 15" min – 48" max AFF
IRC 2021 — Bathroom-Specific Provisions(IRC R307.1, R303.3, R308.4, P2705.1.5, E3901.6, E3902.1, E3902.8)
View StandardResidential code-controlling minimums for bathroom fixture clearance, ventilation, glazing, and electrical. R307.1 requires 15" centerline of toilet/lavatory/bidet to any wall, fixture, or obstruction with 21" min clear in front. R303.3 requires either an operable window ≥ 3 sq ft (50% operable) or mechanical exhaust ≥ 50 cfm vented to outdoors. R308.4 requires tempered glazing for shower enclosures and within 18" AFF. E3901.6 requires at least one GFCI receptacle within 36" of the lavatory edge; E3902.1 requires all bathroom 125 V receptacles to be GFCI; E3902.8 requires all receptacles within 6 ft of tub/shower to be GFCI.
Key Requirements:
- •R307.1 / IPC 405.3.1: 15" centerline minimum from toilet/lavatory/bidet to any wall, fixture, obstruction
- •R307.1: 21" min clear in front of lavatory or toilet
- •P2705.1.5: 30" centerline-to-centerline min between two lavatories
- •R303.3: ventilation — 50 cfm mechanical exhaust OR 3 sq ft window with 50% operable
- •E3901.6: at least one GFCI receptacle within 36" of lavatory outside edge
- •E3902.1: all bathroom 125 V / 15-20 A receptacles must be GFCI
- •E3902.8: all receptacles within 6 ft of outside edge of tub/shower must be GFCI
- •R308.4: tempered glazing for shower enclosures and < 60" above standing surface in tub/shower
EPA TSCA Title VI / CARB Phase 2 — Composite Wood Formaldehyde(40 CFR 770 / CARB ATCM)
View StandardFederal formaldehyde-emission limits for composite wood products and finished goods containing them. Harmonized with California's CARB Phase 2 since June 1, 2018; mandatory labeling effective March 22, 2019. Bath vanity boxes, doors, drawers, shelves, and end panels that incorporate regulated composite wood products are covered. Test method ASTM E1333-10. Bath-specific note: moisture-resistant MDF (M-MDF, often green-tinted) and marine-grade plywood are common bath substrates — both still subject to TSCA Title VI labeling.
Key Requirements:
- •Hardwood plywood (veneer or composite core): ≤ 0.05 ppm
- •Particleboard: ≤ 0.09 ppm
- •Medium-density fiberboard (MDF): ≤ 0.11 ppm
- •Thin MDF (≤ 8 mm / 0.315 in.): ≤ 0.13 ppm
- •Compliance label on every package or finished cabinet, with certifier ID
- •NAF (No Added Formaldehyde) and ULEF (Ultra-Low Emitting) exemption categories permitted
ANSI/BHMA A156.9 — Cabinet Hardware(ANSI/BHMA A156.9-2020)
View StandardAmerican National Standard for cabinet hardware — hinges, knobs, pulls, catches, shelf rests, brackets, drawer slides. Same standard governs vanity hardware as kitchen. Three grades: Grade 1 institutional / heavy-duty, Grade 2 premium residential, Grade 3 residential basic. Soft-close concealed cup hinges (Blum BLUMOTION 38N, CLIP top 71B; Salice; Hettich) and undermount soft-close drawer slides (Blum TANDEM 563H, Hettich Quadro) are now standard on semi-custom and most stock vanities.
Key Requirements:
- •Grade 1 (institutional): highest cycle endurance
- •Grade 2 (premium residential): mid-range cycle endurance
- •Grade 3 (residential basic): minimum cycle endurance
- •European 35 mm cup hinge — industry-standard concealed hinge cup
- •Drawer slides: side-mount epoxy (RTA), ball-bearing (stock), undermount soft-close (semi-custom and up)
- •Mounting hole spacing: single screw (knob); 3, 4, 5 in., 96, 128, 160 mm (pulls)
ANSI/HPVA HP-1 — Hardwood and Decorative Plywood (with bath glue specification)(ANSI/HPVA HP-1-2024)
View StandardAmerican National Standard for hardwood and decorative plywood. Bath-specific specification: vanity boxes should use Type I (fully waterproof) glue, particularly for sink-base panels and bottom panels exposed to potential supply-line drips. Type II (interior glue) is acceptable for non-sink-base components. Marine-grade plywood (BS 1088) is the premium bath spec on high-end vanities.
Key Requirements:
- •Type I exterior glue (fully waterproof) — recommended for vanity sink-base components
- •Type II interior glue — acceptable for non-sink-base components
- •Face / back / inner-ply grade classification (AA, A, B, C, D, E)
- •Moisture content tolerances at manufacture and shipment
- •Formaldehyde emissions per TSCA Title VI (≤ 0.05 ppm)
EPA WaterSense — Lavatory Faucets (informational)(EPA WaterSense Specification for Lavatory Faucets and Faucet Accessories)
View StandardVoluntary EPA program certifying water-efficient lavatory faucets. Maximum flow 1.5 gpm at 60 psi (with 0.8 gpm minimum to maintain performance). The bathroom cabinets calculator may flag WaterSense compliance for the lavatory faucet but does not affect cabinet selection — included for cross-trade reference.
Key Requirements:
- •Maximum flow: 1.5 gpm at 60 psi
- •Minimum flow: 0.8 gpm at 20 psi (to maintain performance)
- •Independent third-party certification required for the WaterSense label
Standards Disclaimer: Standards and codes are subject to periodic updates. Always verify current requirements with local building authorities and professional engineers before beginning construction. Links provided are for reference only.
Cost Variation by Bath Type and Tier
Powder room vs full bath vs primary — different scope, different bands
Bath type drives scope, and scope drives total cost. Powder rooms are 'jewelry' rooms — small, high-style, low-volume; full baths are workhorse single-vanity setups; primary baths are 60–96" double vanities with linen towers and matched mirrors. Per-LF cabinet pricing holds at the same band across types, but accessory and labor cost stack much higher on a primary.
Regional Examples:
Stock Combo vs Semi-Custom — When to Step Up
Cultured-marble integral combo vs separate stone top
Stock vanity combos bundle a moisture-resistant MDF cabinet with a cultured-marble (cast resin) top with integrated bowl as a single SKU at 18–60" widths. The all-in package is convenient and cheap but limits sink type (no undermount possible on cultured marble), faucet hole spacing (preset 4" centerset or single-hole), and finish options. Stepping up to semi-custom adds soft-close hardware, finished plywood interiors, real wood doors, undermount-capable stone or quartz tops, and 8" widespread faucet drilling.
Regional Examples:
Floating Vanities — Modern Style with Hidden Costs
Wall-mount aesthetic requires in-wall blocking and sometimes drain relocation
Floating / wall-mount vanities have surged in popularity in modern and contemporary bath design — they make the floor read continuous and showcase tile work, and they're easier to clean under. But they require in-wall 2×6 (or larger) blocking between studs at bracket height before drywall, OR opening and patching existing drywall for retrofits. They also frequently force drain relocation from floor to back wall.
Regional Examples:
Vessel Sinks — Cabinet Height Adjustment
Don't blow the rim height by ordering a standard-height base
Vessel sinks sit ON the counter rather than under or in it, adding 4–6" of bowl rim above the top. To keep the finished rim height in the 34–36" comfort range, the cabinet must be 4–7" shorter than a typical comfort-height base. Many manufacturers ship 'vessel-height' bases at 28–30" specifically for this use; ordering a standard 34½" comfort base under a vessel sink puts the rim at 39–40" AFF — too high for most users.
Regional Examples:
Medicine Cabinet Reframing
Single stud bay vs double bay vs multi-stud — wall-framing economics
Standard 16" o.c. wall framing leaves a 14½" clear stud bay. Recessed medicine cabinets up to 14–16" wide drop in cleanly with no reframing — install cost ~$150–$250. Cabinets 20–24" wide require cutting and reinforcing one stud (with a header above and below) — adds $200–$400 reframing labor. Triple-view cabinets at 30–48" require cutting and reinforcing 2–3 studs — $400–$700 reframing.
Regional Examples:
Climate, Moisture, and Substrate Selection
Bath cabinets see sustained humidity — substrate matters
Bath cabinets see 60–80% RH for sustained periods after a hot shower, plus occasional supply-line drips and steam exposure. ANSI/KCMA A161.1 includes a heat/humidity test (24 hr at 120 °F / 70% RH) but real-world conditions are harsher. Substrate selection materially affects 15–20-year durability. There is no ANSI standard specifically titled 'moisture-resistant' or 'bath-rated' for cabinet construction — manufacturers indicate moisture resistance through (a) moisture-resistant MDF substrate, (b) marine-grade or exterior-glue plywood, (c) PVC or thermofoil door faces and edges, (d) sealed/coated edges on all cut substrate, and (e) finished cabinet interiors rather than raw substrate.
Regional Examples:
Before You Build
- •Contact your local building department for specific requirements
- •Verify frost line depths, wind zones, and seismic requirements for your area
- •Check if permits are required and schedule required inspections
- •Consult with a local contractor familiar with local codes
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How to Use This Calculator
- Pick your bath type — powder room, full bathroom, or primary / master. Loads sensible defaults for vanity width, depth, height, sink type, and accessories.
- Enter or override vanity dimensions: width (in 6" increments — 18, 24, 30, 36, 42, 48, 60, 66, 72, 84), depth (21" standard; 18" tight; 24" matches kitchen), and height preference (standard 30–32", comfort 34½", ADA ≤ 33¼", or vessel-adjusted ~30").
- Pick mounting: floor-standing (toe kick), furniture-style with legs, or wall-mount / floating (requires in-wall blocking).
- Pick sink type: drop-in / self-rimming (any top), undermount (stone/quartz top required), vessel (cabinet auto-shortens), integral cultured-marble combo (no cutout), pedestal or wall-mount (no vanity).
- Pick sink count (single up to 60"; double 60"+ to meet IRC 30" centerline-to-centerline minimum) and faucet config (single-hole, 4" centerset, 8" widespread, or wall-mount).
- Pick tier: RTA / stock / semi-custom / custom. Drives door style, finish quality, and lead time. Bath cabinets are smaller scope than kitchen but use the same construction grades.
- Add accessories: linen storage (vanity-side, tall 18", tall 24", or linen+hamper combo), medicine cabinet (surface-mount or recessed in single / double / multi-stud bay), and mirror (frameless, framed, designer, or LED-backlit).
- Optional — enter wall length, toilet centerline distance, front clearance, and door swing. The calculator surfaces non-fatal warnings against IRC R307.1 / IPC 405.3.1 fixture clearances and NKBA Bath Planning Guidelines.
- Pick plumbing modification scope (reuse / minor relocation / major drain / convert single→double / floating-vanity drain) and toggle old-vanity removal.
- Click Calculate — see vanity dimensions, doors / drawers / hinges / slides / knobs / pulls, top width/depth, sink cutout dimensions per template, faucet hole count, plumbing rough-in heights, accessory line items, and IRC / NKBA layout warnings.
How vanity height changes by sink type
Standard vanity height is 30–32" (older homes, traditional design); comfort / counter height is 34½–36" (current new construction default — matches kitchen base). For vessel sinks the cabinet drops 4–7" to 28–30" so the finished rim (cabinet + ¾" top + 4–6" vessel rim) lands in the 34–36" comfort range. ADA-compliant lavatory rim is 34" max AFF (ICC A117.1 §606.3), so the cabinet must be ≤ 33¼" before the top — paired with knee-space construction (27" min H × 30" min W × 8" min D extending to 11" at 9" AFF) and pipe insulation per §606.5. The calculator handles the math automatically; just pick your height preference and sink type.
Frequently Asked Questions
How much do bathroom vanities cost?
Per HomeAdvisor / Angi / HomeGuide / Fixr 2025–2026 aggregates: 18–24" powder-room combos $200–$600 (cabinet + cultured-marble top + bowl); 30–36" full-bath combos $300–$1,200; 36" semi-custom cabinet only $900–$1,800; 60" double semi-custom $1,800–$3,500; 72" double semi-custom $2,500–$5,000; 84" double semi-custom $3,500–$6,500; custom 36–84" runs $1,500–$12,000+. Bath vanities typically run 20–30% higher per linear foot than equivalent kitchen base cabinets at the same tier — smaller runs amortize less and more decorative finishes are common in bath. Stock combos bundle the top + bowl into one SKU; semi-custom and custom price the cabinet only and the top is fabricated separately.
What's the difference between standard, comfort, and ADA vanity height?
Standard / vanity height is 30–32" tall — common in older homes and traditional design, still used for children and shorter users. Comfort / counter height is 34½–36" tall (cabinet) plus a ¾" top — matches kitchen base, now the default in new construction. ADA-compliant per ICC A117.1-2017 §606.3 limits the finished lavatory rim to 34" max AFF — so the cabinet plus top together cannot exceed 34". ADA design typically pairs a 33¼"-max cabinet with knee-space construction (27" min H × 30" min W × 8" min D, extending to 11" at 9" AFF) and pipe insulation per §606.5. Comfort-height vanities are NOT ADA-compliant; vessel-sink installations require a shorter cabinet (28–30") so the finished rim still lands in the 34–36" range. The vanity height diagram shows height by sink type.
How wide does my vanity need to be for a double sink?
60" minimum width to meet the IRC P2705.1.5 30" centerline-to-centerline minimum between two lavatories. NKBA recommends 36" centerline-to-centerline, which requires 72"+ of vanity width. The calculator enforces the 60" minimum and surfaces a warning if you try to fit two sinks in less. Single-sink vanities up to 60" wide are common; 60–72" is a transitional zone where you can choose single-with-side-drawers or true double-sink; 72"+ trends to double-sink in primary baths. The vanity clearances diagram shows the plan clearances.
What sink cutout do I need for a Kohler undermount lavatory?
Use the manufacturer's template — Kohler ships a printed paper template with each undermount lavatory. Reference cutouts per Kohler product specs: Caxton K-2210 17" oval (template 1151011-7) is bowl interior 16"×13" with cutout ~16⅜"×13⅛"; Archer K-2355 20" rectangular (template 1224722-7) is bowl interior 17⅝"×13"; Cursiva K-Whatever 20" rectangular cutout 17"×12⁹⁄₁₆". General rule: undermount cutout = bowl interior + ⅛" (typical fabricator allowance). Drop-in cutout = nominal sink size − 1". Vessel sinks require only a 1¾" round drain hole. Integral cultured-marble combos have no cutout — bowl is part of the top.
Do I need to reframe the wall for a recessed medicine cabinet?
Depends on the cabinet width and your wall framing. Standard 16" on-center 2×4 framing gives a 14½" clear stud bay. Recessed cabinets up to 14–16" wide drop in cleanly with no reframing — install ~$150–$250. Cabinets 20–24" wide require cutting and reinforcing one stud (with double 2×6 or 2×8 headers above and below) — adds $200–$400 reframing labor. Triple-view cabinets at 30–48" require cutting and reinforcing 2–3 studs and may interfere with electrical or plumbing in the wall — $400–$700 reframing. The calculator includes the reframing line item automatically when you select a recessed cabinet that requires it. Surface-mount cabinets (project 5–8" from finished wall) avoid all reframing — install ~$75–$200, just hang from studs.
Where does the drain rough-in go for a bathroom vanity?
Standard floor-standing vanity: drain centerline 18–20" AFF (acceptable range 16–22") through the back wall, centered on the sink basin (NOT necessarily centered on the cabinet). Hot/cold supplies at 20–22" AFF (typically 2–4" above drain), spaced 4" apart for 4" centerset faucets or 8" apart for 8" widespread. Floating / wall-mount vanities require the drain through the back wall at a raised height (14–18" AFF) shifted to clear drawer cutouts — no floor penetration possible since the cabinet has no floor contact. Drain pipe is 1½" trap arm; supplies are ½" copper or PEX. P-trap needs 6–8" vertical clear space below the drain; drawer-only vanities typically omit the lowest center drawer or use a U-cut to clear the trap. The sink rough-in diagram shows the rough-in heights and centerlines.
What clearances are required between the vanity and toilet?
Per IRC R307.1 / IPC 405.3.1: 15" minimum from centerline of toilet to any wall, fixture (vanity edge), or obstruction. NKBA recommends 18". The same 15" minimum applies between centerline of toilet and centerline of bidet, and between centerline of toilet and side wall. In front of the lavatory, IRC requires 21" minimum clear floor space; NKBA recommends 30". Centerline of lavatory to side wall is 15" minimum (IRC P2705.1.5) / 20" recommended (NKBA). Two adjacent lavatories on a double vanity: 30" minimum centerline-to-centerline (IRC P2705.1.5) / 36" recommended (NKBA). The calculator surfaces non-fatal warnings whenever your inputs fall below the IRC code minimum or NKBA recommended values.
Should I get a floating vanity?
Floating / wall-mount vanities are the dominant modern style — they make the floor read continuous (showcasing tile work) and they're easier to clean under. But they require in-wall 2×6 or 2×8 blocking between studs at bracket height before drywall, OR opening and patching existing drywall for retrofits ($300–$700 added scope). They also frequently force drain relocation from floor to back wall ($400–$1,200). Heavy floating vanities (60"+ with stone tops) need ¾" plywood backer plus 2×6 above and below, lag-bolted into studs, supporting 200–250 lb per manufacturer specs. Drywall anchors alone are insufficient — the bracket must hit studs or continuous blocking. Floating vanities are not 'cheaper' or 'simpler' than floor-standing — plan on $500–$1,500 of hidden trade-cost on average.