Work out grout in pounds and bags from tile size, joint width and depth — with worked examples for a floor, a shower and a mosaic, plus a coverage guide. This guide is part of the Dixon App Studio blog — practical, no-fluff articles for builders, freelancers, home cooks, and sports fans. Read more guides on the blog index, browse our full app lineup, or use one of our free online converters whenever you need a quick answer.
It depends on tile size, joint width and depth. For 12 × 24 × 3/8 in tile with 1/8 in joints, about 0.05 lb of sanded grout per sq ft; for a 2 × 2 in mosaic at 1/8 in, about 0.26 lb per sq ft.
Roughly 95 sq ft of 2 × 2 mosaic, 355 sq ft of 12 × 12 tile and 470 sq ft of 12 × 24 tile at 1/8 in joints with full-depth sanded grout. Check the chart on the bag you buy.
Unsanded for joints narrower than 1/8 in, sanded for joints 1/8 in and wider.
Small tiles mean far more joint length per square foot. A 2 × 2 in mosaic needs about five times the grout per square foot of a 12 × 24 in tile at the same joint width.
Yes, every calculator is free on Android with no signup, and the same calculators run in any browser at smarttilecalculator.com. The app is Android-only, on Google Play; on iPhone, Roofing Calculator & Estimator adds tile tools in its next update.
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