About Remodel Calculators

Free construction calculators for US homeowners and contractors — built on American industry standards, with a Pro plan for the trade.

David Miles, founder of Remodel Calculators

Hi, I'm David

I'm David Miles, the person behind Remodel Calculators. I built this site after watching friends and family — homeowners and tradespeople alike — get burned by bad material estimates. Too much drywall sitting in the garage. A second trip to the supply house mid-job. A contractor quote that didn't add up because nobody actually ran the math against published coverage rates.

So I started building calculators that use the same formulas the pros use — PCA for concrete, MPI for paint, NRCA for roofing, ACI 318 for structural concrete, manufacturer specs for flooring and siding. No guessing, no padded numbers. Just the math, with sensible waste factors baked in.

The site is free to use because most people just need a quick, honest estimate before a Home Depot run or a contractor meeting. The Pro plan exists for the contractors who use these tools every day and want client-ready quotes, POs, and invoices on top of the estimates.

Built for US Homeowners and Contractors

Every calculator on this site is built around US measurement units (feet, inches, square feet, cubic yards, gallons) and references American industry standards and building codes:

  • • IRC — International Residential Code (US adoption)
  • • IECC — International Energy Conservation Code
  • • ACI 318 — American Concrete Institute
  • • PCA — Portland Cement Association
  • • MPI — Master Painters Institute
  • • NRCA — National Roofing Contractors Association
  • • NWFA — National Wood Flooring Association
  • • PDCA — Painting Contractors Association

The climate and code guides cover all 50 US states, with climate-zone considerations drawn from the IECC. If you're estimating a project anywhere in the United States, these tools were built with your job site in mind.

What This Site Is

Remodel Calculators provides accurate construction material estimate tools for contractors, builders, and DIY homeowners. Every calculator uses coverage rates, waste factors, and formulas drawn from recognized standards — PCA, MPI, NRCA, ACI 318, and manufacturer specifications.

Results are estimates. Actual material needs vary by site conditions, surface preparation, and applicator technique. Verify quantities with your supplier before ordering.

Free to Use — Pro for Professionals

Free (No Account Needed)

  • ✓ All 13 calculators, unlimited use
  • ✓ Industry-standard formulas with waste factors
  • ✓ Copy and print results
  • ✓ Professional guides and blog
  • ✓ Save up to 3 projects (free account)

Pro — $12/mo or $99/yr

  • ✓ Detailed material cost breakdowns with editable prices
  • ✓ Unlimited saved projects
  • ✓ Smart contractor forms (Quote, PO, Invoice, Change Order)
  • ✓ Auto-fill forms from calculator results
  • ✓ Print-ready PDF documents

Available Calculators

Exterior

Exterior paint, deck stain, roofing, siding, lap siding, fence, mulch

Interior

Interior paint, drywall, drywall screws, flooring, backsplash tile

Foundation & Concrete

Concrete calculator for slabs, footings, posts, columns, stairs, and walls

Industry Standards

Coverage rates, waste factors, and estimate formulas follow published professional specifications.

How to Use a Calculator

1

Select a Calculator

Choose the calculator that matches your project — concrete, paint, siding, roofing, drywall, flooring, and more.

2

Enter Dimensions

Input your project measurements. Each calculator includes a guide to help you measure correctly.

3

Review the Estimate

Results include material quantities and waste factors. Pro users also get cost breakdowns with editable unit prices.

4

Save & Generate Documents (Pro)

Save your project and generate a pre-filled client quote, purchase order, invoice, or change order in one click.

Who Uses These Calculators

  • ✓Painting Contractors: Quick exterior and interior paint estimates for client quotes
  • ✓General Contractors: Material estimates for siding, roofing, drywall, and concrete — plus professional contractor forms
  • ✓DIY Homeowners: Reliable material estimates before a hardware store run
  • ✓Property Managers: Budget planning for exterior and interior maintenance projects

Estimates, Not Promises

Results are material estimates based on standard coverage rates and waste factors. Actual quantities depend on surface condition, texture, application method, and installer technique. Confirm final quantities with your material supplier and verify compliance with local building codes before purchasing or starting work.

Questions? Get in Touch

If a calculator gives you a result that doesn't match what your supplier or estimator is showing, I want to know about it. Email me directly at info@remodelcalculators.com — I read every message and I'd rather fix a formula than have someone over-order materials based on bad math.

Built in the USA for the Trade

Remodel Calculators is an independently operated site, built and maintained by David Miles in the United States. The goal is simple: give US homeowners and contractors honest material estimates based on published standards — and give the contractors who want more a set of professional tools that pay for themselves on the first job.