Construction
Tile quantity
Estimate the number of tiles for a floor or wall.
Calculators / Construction / Tile grout joint volume
Tile grout joint volume calculator
Estimate grout volume using repeating rectangular tiles and fully filled joints.
On this page
Ideal joint volume1.58L
Volume including allowance1.73L
Calculator controls
How to calculate
Estimate grout volume using repeating rectangular tiles and fully filled joints.
Ideal joint volume =
A*d*(1-L*W/((L+j)*(W+j))) LVolume including allowance =
A*d*(1-L*W/((L+j)*(W+j)))*(1+w/100) LWorked example
- Tiled area (m²): 10
- Tile length (mm): 300
- Tile width (mm): 300
- Joint width (mm): 3
- Filled joint depth (mm): 8
- Volume allowance (%): 10
- Ideal joint volume: 1.58 L
- Volume including allowance: 1.73 L
Assumptions and limits
Uses a repeating tile-and-joint cell. Perimeter effects, bevels and irregular gaps are excluded. Litres of joint volume are not kilograms or manufacturer bag coverage.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Estimate grout volume using repeating rectangular tiles and fully filled joints. Use the actual filled depth and measured joint width. Convert to purchase quantities only with the selected product’s verified yield.
When this tool is useful
Use the actual filled depth and measured joint width. Convert to purchase quantities only with the selected product’s verified yield.
Understanding your inputs
| Input | Example |
|---|---|
Tiled area (m²) A | 10 |
Tile length (mm) L | 300 |
Tile width (mm) W | 300 |
Joint width (mm) j | 3 |
Filled joint depth (mm) d | 8 |
Volume allowance (%) w | 10 |
Frequently asked questions
What does this model leave out?
Uses a repeating tile-and-joint cell. Perimeter effects, bevels and irregular gaps are excluded. Litres of joint volume are not kilograms or manufacturer bag coverage.
How do I reproduce the example?
Enter the displayed example values in their labelled units. Apply the formula before rounding; change one input at a time to compare scenarios.