Tile grout calculator
Enter the tile size and joint width and depth to see how much grout and how many bags you need.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Enter tiled area, tile length, tile width, joint depth (tile thickness), joint width and grout density.
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
Use (kg/m²) = (length + width) ÷ (length × width) × joint depth × joint width × density, sizes in mm and density in kg/L. Total = use × area × (1 + waste ÷ 100).
Example
Inputs: Tiled area = 20 m², Tile length = 600 mm, Tile width = 600 mm, Joint depth (tile thickness) = 8 mm, Joint width = 3 mm. Result: Grout needed (with waste): 2.82 kg; Bags: 1 bags; Use per m²: 0.128 kg/m².
Limits and caveats
- Density differs by product, epoxy being heavier than cement grout, so use the data sheet figure.
- Assumes each joint is filled to the full tile depth.
Questions about this tool
How much grout for 1 m² of 600 × 600 tiles?
With 8 mm depth, a 3 mm joint and 1.6 kg/L, only about 0.128 kg, since large tiles have few joints.
Why do small tiles use more grout?
Joint length per square metre grows as tiles get smaller, so 100 × 100 mm mosaic uses several times more.
What joint width is usual?
About 2 to 3 mm for rectified porcelain and 3 to 5 mm for standard ceramic, or as the maker advises.