Grout Calculator
Joint volume from tile and gap geometry → bags with waste. Click any i for detail.
Tile & joints
Area (sq ft)
i
Area
Total tiled area. |
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|---|---|
Tile width (in)
i
Tile W
Nominal tile width. |
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Tile height (in)
i
Tile H
Nominal tile height. |
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Joint width (in)
i
Joint W
Grout gap. |
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Joint depth (in)
i
Joint D
Often ~ tile thickness. |
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Bag size (lb)
i
Bag
Typical 25 lb bag. |
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Waste (%)
i
Waste
Contingency for mixing loss. |
How to use this calculator
- Enter tiled area and tile size.
- Set joint width and depth.
- Choose bag size and waste %.
- Read volume and bags (rounded up).
Results explained
Grout volume is approximated from joint cross-section relative to each tile’s footprint, scaled by area. Density defaults assume a sanded-ish mix (~100 lb/cu ft) — check your product’s coverage chart.
Quick reference: grout volume
factor ≈ ((W+H)×jw×jd)/(W×H); scale by area.
| Item | Detail |
|---|---|
| Narrow joints | Less grout |
| Thicker tile | Deeper joints → more |
| Waste 10% | Common buffer |
| Label coverage | Overrides this sketch |
Confirm bag yield on the product label before buying.
How the estimate is built
cu_in = area×144×factor; lbs ≈ cu_ft×100; bags = ceil(lbs×(1+waste%)/bag).
Example scenario
100 sq ft of 12×12 with 1/8×1/4 joints → roughly a couple of 25 lb bags with waste.
FAQ
Sanded vs unsanded?
Density/coverage differs — prefer the bag chart.
Mosaic sheets?
Use the sheet’s effective tile size or manufacturer coverage.
Wall vs floor?
Same geometry; product choice differs.
Thinset too?
See the thinset calculator.