Tile size drives grout quantity — small tiles need far more grout than large ones

At the same joint width, small tiles use dramatically more grout than large ones: a 2×2 mosaic needs ~12× the grout of a 24×24 tile over the same area. Grout per sq ft = (L+W)/(L×W) × joint width × joint depth × 144.

Three tiled fields of the same 2-foot-by-2-foot area compared at the same 1/8-inch joint width, with the grout joints shown in blue. A 2×2 mosaic packs 144 tiles and a dense web of joints and uses about 6.75 cubic inches of grout per square foot. A 12×12 tile has just four tiles and uses about 1.13. A 24×24 large-format tile is a single tile with almost no joints and uses about 0.56. At the same joint width the mosaic drinks roughly twelve times the grout of the large tile, because grout per square foot equals the perimeter-to-area ratio (L+W)/(L×W) times joint width times joint depth times 144 — joint length, not tile count, drives the total. — Source: Formula A (perimeter-to-area) from the grout calculator; CBP / Laticrete / MAPEI / ARDEX charts

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Three tiled fields of the same 2-foot-by-2-foot area compared at the same 1/8-inch joint width, with the grout joints shown in blue. A 2×2 mosaic packs 144 tiles and a dense web of joints and uses about 6.75 cubic inches of grout per square foot. A 12×12 tile has just four tiles and uses about 1.13. A 24×24 large-format tile is a single tile with almost no joints and uses about 0.56. At the same joint width the mosaic drinks roughly twelve times the grout of the large tile, because grout per square foot equals the perimeter-to-area ratio (L+W)/(L×W) times joint width times joint depth times 144 — joint length, not tile count, drives the total.

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    <img src="https://remodelcalculators.com/api/figure-embed/grout-tile-size-coverage" alt="Three tiled fields of the same 2-foot-by-2-foot area compared at the same 1/8-inch joint width, with the grout joints shown in blue. A 2×2 mosaic packs 144 tiles and a dense web of joints and uses about 6.75 cubic inches of grout per square foot. A 12×12 tile has just four tiles and uses about 1.13. A 24×24 large-format tile is a single tile with almost no joints and uses about 0.56. At the same joint width the mosaic drinks roughly twelve times the grout of the large tile, because grout per square foot equals the perimeter-to-area ratio (L+W)/(L×W) times joint width times joint depth times 144 — joint length, not tile count, drives the total." width="800" height="470" style="width:100%;height:auto;border:0" loading="lazy">
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    Diagram: <a href="https://remodelcalculators.com/construction-diagrams/grout-tile-size-coverage" target="_blank" rel="noopener">Tile size drives grout quantity — small tiles need far more grout than large ones</a> — courtesy of <a href="https://remodelcalculators.com" target="_blank" rel="noopener">RemodelCalculators.com</a>
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Grout Calculator

Calculate how much grout you need in bags, boxes, or epoxy units from your tile size, joint width, and area — TCNA/ANSI coverage formula. Free, no signup.

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