Tile Grout Quantity Calculator

Work out tile grout quantity instantly with clear inputs, formula shown and shareable results.

About Tile Grout Quantity Calculator

Grout volume is total joint length times joint width times depth. Joint length per square metre is 1/tile length plus 1/tile width, so small tiles need far more grout than large ones — mosaic can use ten times the grout of a large format tile.

Formula

Grout quantity

joint length per m2 = 1/L + 1/W; volume = length x width x depth; mass = volume x 1.6 kg/L

Worked example

With the default values below, Tile Grout Quantity Calculator returns Grout required of 3.46. Change any input above and every figure here is recalculated in your browser.

Inputs used

Area to tile: 18 m²
Tile length: 600 mm
Tile width: 300 mm
Joint width: 3 mm

Results

Grout required: 3.46 kg
Joint volume: 2.16 L
Tiles required: 111 tiles
Total joint length: 90.00 m

Step by step

1Values used
2Grout quantity
3Grout required= 3.46 kg
4Joint volume= 2.16 L
5Tiles required= 111 tiles
6Total joint length= 90.00 m

Assumptions and limits

The result is derived only from the 4 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 2 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

Why does tile size change grout use so much?

Grout follows the perimeter of every tile. Halving the tile size doubles the joint length per square metre.

What joint width should I use?

2-3 mm for rectified porcelain, 3-5 mm for ceramic, and wider for handmade or natural stone where size varies.