Grout Calculator
Enter your tile size, grout joint width, and area to estimate the pounds of grout needed to fill the joints, with waste included.
Results
- Grout needed
- 26 lb
- 25 lb bags
- 2 bags
- Per sq ft
- 0.24 lb
Estimates only. Round up and buy a little extra to account for waste, spills, and breakage.
Enter your tile size, grout joint width, and area to estimate the pounds of grout needed to fill the joints, with waste included.
How to use the grout calculator
- Enter the tiled area in sq ft.
- Enter the tile length in in.
- Enter the tile width in in.
- Enter the tile thickness in in.
- Enter the grout joint width in in.
- Enter the waste factor in %.
- Optionally add a price to estimate the total project cost.
- Read your quantities instantly — no sign-up, and you can print the estimate to take to the supplier.
Worked example
Inputs
- Tiled area
- 100 sq ft
- Tile length
- 12 in
- Tile width
- 12 in
- Tile thickness
- 0.375 in
- Grout joint width
- 0.125 in
- Waste factor
- 10 %
Results
- Grout needed
- 26 lb
- 25 lb bags
- 2 bags
- Per sq ft
- 0.24 lb
Using the example values above, the grout calculator returns 26 lb (grout needed). Change any field to match your own project and the numbers update instantly.
How much extra should I order?
Always order a little extra. A 5% waste factor suits simple, square projects; 10% is right for most jobs; bump it to 15–20% for irregular shapes, diagonal patterns, or uneven ground. Running short almost always costs more than the leftover material.
Formula
Grout per sq ft depends on tile size, joint width, and tile thickness; multiply by area and add waste.
Frequently asked questions
- How much grout do I need for tile?
- Grout use depends on tile size, joint width, and thickness — smaller tiles and wider joints need much more grout per square foot.
- Does tile size change grout amount?
- Yes. Large tiles have less joint length per square foot, so they use far less grout than small mosaic tiles.
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