Grout Coverage Chart: Pounds, Bags and Gallons by Tile Size and Joint Width
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A 25 lb bag of cement grout covers roughly 340 sq ft of 12 x 12 tile (3/8 inch thick) with 1/8 inch joints, but only about 90 sq ft of 2 x 2 mosaic with the same joints. The tables below give pounds per 100 sq ft, square feet per bag and gallons of joint volume for 15 tile sizes and five joint widths.
Key takeaways
- Grout quantity scales with joint width, joint depth and, above all, how small the tile is.
- Halving tile size roughly doubles the grout needed; doubling joint width roughly doubles it too.
- Figures assume full-depth joints; real jobs with slight recess or thinset in the joint use a little less, while textured or cushion-edge tile uses more.
- For a specific room, use the grout calculator, which applies the same method to your exact numbers.
Pounds of cement grout per 100 sq ft
Thickness shown with each tile is the joint depth assumed. No waste allowance is included in this table.
| Tile size (inches) | 1/16 in joint | 1/8 in joint | 3/16 in joint | 1/4 in joint | 3/8 in joint |
|---|---|---|---|---|---|
| 1 x 1 mosaic (1/4 in thick) | 25.1 | 46.1 | 63.9 | 79.1 | 103.4 |
| 2 x 2 mosaic (1/4 in thick) | 13.1 | 25.1 | 36.0 | 46.1 | 63.9 |
| Penny round (approx. 3/4 in) (1/4 in thick) | 32.5 | 58.3 | 79.1 | 96.1 | 122.0 |
| 3 x 6 subway (5/16 in thick) | 8.4 | 16.4 | 24.0 | 31.3 | 44.9 |
| 4 x 4 (5/16 in thick) | 8.4 | 16.4 | 24.0 | 31.3 | 45.0 |
| 4 x 12 (3/8 in thick) | 6.7 | 13.3 | 19.6 | 25.7 | 37.4 |
| 6 x 6 (5/16 in thick) | 5.6 | 11.1 | 16.4 | 21.5 | 31.3 |
| 8 x 8 (3/8 in thick) | 5.1 | 10.1 | 14.9 | 19.7 | 28.8 |
| 6 x 24 plank (3/8 in thick) | 4.2 | 8.4 | 12.5 | 16.4 | 24.1 |
| 8 x 48 plank (3/8 in thick) | 3.0 | 5.9 | 8.8 | 11.6 | 17.2 |
| 12 x 12 (3/8 in thick) | 3.4 | 6.8 | 10.1 | 13.3 | 19.7 |
| 12 x 24 (3/8 in thick) | 2.6 | 5.1 | 7.6 | 10.0 | 14.9 |
| 18 x 18 (3/8 in thick) | 2.3 | 4.5 | 6.8 | 9.0 | 13.3 |
| 24 x 24 (3/8 in thick) | 1.7 | 3.4 | 5.1 | 6.8 | 10.1 |
| 24 x 48 (3/8 in thick) | 1.3 | 2.6 | 3.8 | 5.1 | 7.6 |
Square feet per 25 lb bag
This version includes a 10% waste allowance, which is what you should plan on when buying.
| Tile size (inches) | 1/16 in joint | 1/8 in joint | 3/16 in joint | 1/4 in joint | 3/8 in joint |
|---|---|---|---|---|---|
| 1 x 1 mosaic | 91 | 49 | 36 | 29 | 22 |
| 2 x 2 mosaic | 173 | 91 | 63 | 49 | 36 |
| Penny round (approx. 3/4 in) | 70 | 39 | 29 | 24 | 19 |
| 3 x 6 subway | 271 | 139 | 95 | 73 | 51 |
| 4 x 4 | 271 | 139 | 95 | 73 | 50 |
| 4 x 12 | 337 | 171 | 116 | 88 | 61 |
| 6 x 6 | 404 | 205 | 139 | 106 | 73 |
| 8 x 8 | 447 | 226 | 152 | 116 | 79 |
| 6 x 24 plank | 536 | 271 | 182 | 138 | 94 |
| 8 x 48 plank | 763 | 385 | 258 | 195 | 132 |
| 12 x 12 | 668 | 336 | 226 | 171 | 116 |
| 12 x 24 | 889 | 447 | 300 | 226 | 153 |
| 18 x 18 | 999 | 502 | 336 | 254 | 171 |
| 24 x 24 | 1,330 | 668 | 447 | 336 | 226 |
| 24 x 48 | 1,772 | 889 | 594 | 447 | 300 |
Joint volume in gallons per 100 sq ft
Premixed, urethane and epoxy grouts are sold by volume or by kit. This table gives the raw joint volume (no waste) so you can compare against a product's stated yield.
| Tile size (inches) | 1/16 in joint | 1/8 in joint | 3/16 in joint | 1/4 in joint | 3/8 in joint |
|---|---|---|---|---|---|
| 1 x 1 mosaic | 1.78 | 3.27 | 4.53 | 5.61 | 7.34 |
| 2 x 2 mosaic | 0.93 | 1.78 | 2.56 | 3.27 | 4.53 |
| Penny round (approx. 3/4 in) | 2.31 | 4.13 | 5.61 | 6.82 | 8.66 |
| 3 x 6 subway | 0.59 | 1.16 | 1.70 | 2.22 | 3.18 |
| 4 x 4 | 0.59 | 1.16 | 1.71 | 2.22 | 3.20 |
| 4 x 12 | 0.48 | 0.94 | 1.39 | 1.82 | 2.65 |
| 6 x 6 | 0.40 | 0.79 | 1.16 | 1.53 | 2.22 |
| 8 x 8 | 0.36 | 0.71 | 1.06 | 1.40 | 2.05 |
| 6 x 24 plank | 0.30 | 0.60 | 0.88 | 1.17 | 1.71 |
| 8 x 48 plank | 0.21 | 0.42 | 0.62 | 0.83 | 1.22 |
| 12 x 12 | 0.24 | 0.48 | 0.71 | 0.94 | 1.40 |
| 12 x 24 | 0.18 | 0.36 | 0.54 | 0.71 | 1.06 |
| 18 x 18 | 0.16 | 0.32 | 0.48 | 0.64 | 0.94 |
| 24 x 24 | 0.12 | 0.24 | 0.36 | 0.48 | 0.71 |
| 24 x 48 | 0.09 | 0.18 | 0.27 | 0.36 | 0.54 |
Method
Each tile and its share of the surrounding joint form a module of (L + j) by (W + j). The grout share of the surface is 1 - LW / ((L + j)(W + j)). Multiplying by 14,400 square inches (100 sq ft) and by the joint depth gives cubic inches of grout. Dividing by 231 converts to US gallons.
For powdered cement grout, the volume is multiplied by 0.061 lb of dry powder per cubic inch of filled joint. That factor reflects the density of cured sanded and polymer-modified cement grout less the mixing water that evaporates or binds, and it falls in the middle of what major manufacturers' published coverage charts imply. Unsanded grouts typically need slightly less powder for the same volume. These numbers are computed by Grout Atlas from geometry, not copied from any one product chart; your product's data sheet remains the reference for that product.
Frequently asked questions
How much grout do I need for 100 square feet?
For 12 x 12 tile, 3/8 inch thick, with 1/8 inch joints, about 6.8 lb of cement grout; for 12 x 24 large format with 1/8 inch joints, about 5 lb; for 2 x 2 mosaic with 1/8 inch joints, about 25 lb. Add 10% for waste.
Why do manufacturer charts differ from each other?
They assume different joint depths, densities and waste. Some charts assume joints filled only to a portion of tile thickness. That is why Grout Atlas publishes the method alongside the numbers.
How do I convert to kilograms?
Multiply pounds by 0.4536. For metric joint volume, multiply gallons by 3.785 to get liters.
Sources and standards
- Grout Atlas calculation from tile module geometry (method above).
- Manufacturer grout coverage charts and technical data sheets (density cross-check).
- ANSI A108.10, Installation of Grout in Tilework.
Grout Atlas guidance is checked against ANSI A108/A118 and ISO 13007 requirements, the TCNA Handbook and manufacturer technical data sheets. Product formulations change, so confirm details on the current data sheet for the product you buy. Spotted an error? Report a correction.