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Tile & Flooring

Grout Coverage Calculator

Calculate how many pounds of grout you need based on tile size, joint width, and area.

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Grout needed lbs
— lbs
Grout is one of those materials that is hard to estimate by feel. The joints look tiny but the total volume across a full floor or wall adds up fast. This calculator uses the industry-standard formula based on your tile dimensions, joint width, and tile thickness to give you an accurate weight in pounds. Grout joint width depends on tile size and type. Large format tiles 12 inches and above typically use 1/8-inch joints for a clean modern look. Medium tiles in the 4 to 8 inch range often use 3/16-inch joints. Handmade or rustic tiles with irregular edges need wider 1/4-inch joints to accommodate size variation. Mosaic tiles on mesh sheets usually need 1/16 to 1/8-inch joints. Grout comes in two main types. Sanded grout is used for joints 1/8 inch and wider. The sand provides bulk and strength for larger gaps and prevents cracking as the grout dries. Unsanded grout is used for joints narrower than 1/8 inch and on polished stone tiles where sand particles could scratch the surface. A standard 25-pound bag of sanded grout covers roughly 100 to 200 square feet depending on tile size and joint width. Smaller tiles with wider joints consume dramatically more grout than large tiles with thin joints because there is proportionally more joint area relative to tile area. A floor of 2x2-inch mosaic tiles with 1/8-inch joints can use five times more grout than the same area in 24x24-inch tiles. Mix grout in small batches. A full bucket of mixed grout starts to set up within 20 to 30 minutes and becomes unworkable. Mix only as much as you can apply and clean up in that window. Working in sections of about 10 to 15 square feet per batch is a good pace for most DIY installers. Always buy more grout than the calculator shows. Grout is cheap, and leftover dry powder stores indefinitely in a sealed bag. If you need to regrout a cracked joint years later, having the exact same color and brand on hand is invaluable. Color matching between batches is unreliable, and discontinued colors are impossible to replace.