Grout Calculator
Estimate pounds of grout needed based on tile size and joint width.
Grout Calculator
What This Calculator Does
The Grout Calculator estimates the pounds of sanded or unsanded grout needed for a tile installation based on tile area, tile size, and grout joint width. Enter your project details to get the total pounds of grout and the number of bags required.
Grout fills the joints between tiles, providing structural integrity and a finished appearance. The amount needed depends on the tile size (larger tiles need less grout), tile thickness, and joint width. Standard residential tile installations use 1/8-inch grout lines with 12x12 tiles.
Unsanded grout is used for joints under 1/8 inch (glass and polished stone tiles). Sanded grout is used for joints 1/8 inch and wider - the sand prevents cracking and provides additional strength.
How to Use
- Measure the total tile area in square feet.
- Select your tile size and grout joint width from the dropdowns.
- Enter the area and select your options in the calculator above.
- Click "Calculate" to get the pounds of grout and bags needed.
- Grout is sold by weight (10-lb and 25-lb bags) - buy slightly more than calculated for mixing consistency.
Reference Table
| Tile Size | 1/8-in Joint | 1/4-in Joint | Per 100 sq ft | 10-lb Bags |
|---|---|---|---|---|
| 4x4 in | 25 lbs | 35 lbs | 25-35 lbs | 3 bags |
| 6x6 in | 15 lbs | 22 lbs | 15-22 lbs | 2 bags |
| 12x12 in | 8 lbs | 14 lbs | 8-14 lbs | 1 bag |
| 18x18 in | 5 lbs | 9 lbs | 5-9 lbs | 1 bag |
| 24x24 in | 3 lbs | 6 lbs | 3-6 lbs | 1 bag |
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