Grout Quantity
Estimate grout volume for a tiled floor or wall.
About Grout Quantity
The total joint length per square foot is estimated from the tile size, then multiplied by joint width and depth to get volume. Grout is boxed in fixed weights, so a volume estimate converted to boxes keeps one trip to the store covering the whole floor.
Formula
Grout Quantity
Joint length per sq ft = 288 / tile size; volume = length x width x depth
- joint depth
- How deep the open seam between tiles will be filled
Worked example
With the default values below, Grout Quantity returns Grout Needed of 17.5. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Tile areaminimum 1 sq ft
- 100 sq ft
- Tile sizeminimum 1 in
- 12 in
- Joint widthminimum 0.01 in
- 0.25 in
- Joint depthminimum 0.01 in
- 0.35 in
- Box sizeminimum 1 lb
- 10 lb
Results
- Grout Needed
- 17.5 lb
- Grout Volume
- 0.122 cu ft
- Boxes to Buy
- 2
Step by step
- 1Values used
- 2Grout Quantity
- 3Grout Needed= 17.5 lb
- 4Grout Volume= 0.122 cu ft
- 5Boxes to Buy= 2
Assumptions and limits
- The result is derived only from the 5 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is Grout Quantity calculated?
Joint length per sq ft = 288 / tile size; volume = length x width x depth The total joint length per square foot is estimated from the tile size, then multiplied by joint width and depth to get volume.
Why does Grout Quantity matter?
Grout is boxed in fixed weights, so a volume estimate converted to boxes keeps one trip to the store covering the whole floor.
What values do I need to enter?
This calculator takes 5 inputs: Tile area, Tile size, Joint width, Joint depth, Box size. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.