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<> The estimate uses the standard industry formula: grout volume scales with the perimeter of each tile, the joint width, and the tile thickness, divided…
With these inputs:
| Result | Value |
|---|---|
| Grout needed | 6.4 lbs |
| Recommended type | Sanded grout |
| Joint width | 1/8" |
| With 10% extra | 7 lbs |
| 25 lb bags to buy | 1 bag |
| Coverage of one 25 lb bag | 471 sq ft |
| Grout volume per sq ft | 0.83 cu in (at 110 lb/cu ft) |
Mix full bags where possible so color stays consistent across the floor.
<> The estimate uses the standard industry formula: grout volume scales with the perimeter of each tile, the joint width, and the tile thickness, divided across the tile face area. Sanded vs unsanded: use sanded grout for joints 1/8" and wider, unsanded for 1/16" joints and for polished stone or glass that sand would scratch. Epoxy grout goes further per pound but is less forgiving to work. Buy about 10% extra — mixing a partial second batch to match color mid-job is how you get visible shade lines. Grout volume is driven far more by tile size than by area. A 100 sq ft floor of 2x2 mosaic at 1/8" joints uses roughly five times the grout of the same floor in 24x24 tile at 1/16" joints, because small tiles pack far more linear feet of joint into the same square footage. Pick your joint width with the spacer size guide before you order, size the mortar with the thinset calculator , and price the whole job with the tile cost calculator . First time grouting? Follow our step-by-step guide to grouting tile .
With 1/8 inch joints and 3/8 inch thick tile, expect roughly 12–18 pounds — one 25 lb bag is usually enough, with margin.
Sanded for joints 1/8 inch and wider. Unsanded for joints under 1/8 inch and for polished marble, glass, or any tile the sand could scratch.
Roughly the same volume, but epoxy is sold by kit and covers more per pound. Follow the kit's coverage chart and mix only what you can install in about 45 minutes.
Rectified porcelain can go as tight as 1/16 inch. Standard pressed ceramic needs 1/8 inch to absorb size variation, natural stone 1/16 to 1/8 inch, and tile over 15 inches usually 1/8 to 3/16 inch, because larger tiles vary more in size.
Wait 24 to 72 hours before light use and a full 72 hours before sealing cement grout, so the moisture can leave the joint. Epoxy grout needs no sealer at all and is fully serviceable in about 24 hours.
Need the whole roof at once? The free roofing calculator works out roof area, squares, shingle bundles, underlayment, drip edge, ridge cap and installed cost from one set of measurements.