Grout Calculator
How much grout for a tiled area? Small tiles need far more grout than large ones. Enter the area, tile size, joint width and depth, and get pounds of grout and 25-lb bags.
Grout for 100 sq ft of 12 × 12 in tile
1 bags (25 lb) — 7.2 lb of mixed grout · 0.07 cu ft
About 100 tiles cover the area (9.3 sq m), with a total joint length of roughly 200 ft. Small tiles need far more grout than large ones — the same 100 sq ft takes about four times as much grout in 6-inch tile as in 12-inch tile, because there are four times as many joints. Buy one extra bag; mixed grout cannot be saved for later.
Estimate. Grout coverage also depends on the product (sanded vs unsanded) and how deep the joints are filled — check the bag's coverage chart and buy to the high side for uneven or stone tile.
Formula used: Grout volume = total joint length × joint width × depth. Total joint length ≈ tiles × (tile width + tile length), shared between neighbours. Weight ≈ volume × 110 lb/cu ft. Bags = weight ÷ 25 lb, rounded up.
How this estimate works: Grout fills the joints between tiles, so the amount depends on how many joints there are — small tiles have far more joints per square foot than large ones. The tool counts the tiles, adds up their joint lengths, multiplies by the joint width and depth to get a volume, and converts that to pounds of mixed grout and 25-pound bags.
How the grout calculator works
Grout fills the joints between tiles, so the amount depends on how many joints there are — small tiles have far more joints per square foot than large ones. The tool counts the tiles, adds up their joint lengths, multiplies by the joint width and depth to get a volume, and converts that to pounds of mixed grout and 25-pound bags. Buy one extra bag; mixed grout cannot be saved for later. This is an estimate — check the bag's coverage chart, especially for uneven or stone tile.
Try next: Tile Calculator · Flooring Calculator · Laminate Flooring Calculator
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