Floors & Walls
Grout Calculator
Estimate grout bags from tiled area using the manufacturer coverage or your measured consumption.
Enter your measurements
Results update as you type.
About this calculator
Grout yield depends on the product, tile size and joint dimensions, so this tool never invents a coverage. Enter the tiled area and either the manufacturer's coverage per bag for your tile/joint configuration, or your product's consumption per area. If coverage is left blank you get instructions, not a made-up number.
How to measure
- Measure the actual tiled area, excluding uncut borders that take no grout.
- Coverage and consumption figures are specific to your tile size and joint width/depth — read them off your product's data sheet.
- Fill all four context fields to see the geometric joint volume and sanity-check the product figure.
How to use this calculator
- Measure the tiled area.
- Find the manufacturer's coverage for your tile size and joint width, or a measured consumption.
- Enter it in the matching mode — coverage per bag or consumption per area.
- Add an allowance and calculate.
Formula
Coverage mode: bags = ⌈area × (1 + allowance ÷ 100) ÷ coverage per bag⌉
Consumption mode: mass = area × (1 + allowance ÷ 100) × consumption; bags = ⌈mass ÷ bag mass⌉
Assumptions
- The coverage must match the actual product, tile and joint configuration; nothing is interpolated silently.
- Coverage charts and jobsite conditions vary — manufacturers state this explicitly.
- A blank coverage produces guidance, not an estimated number.
Common mistakes
- Using a coverage or yield for a different product, depth or application.
- Adding waste twice in both the measured quantity and allowance field.
- Treating a bag count as proof that the selected product is suitable for the installation.
Worked example
Try it: press “Load example” above the form.
Illustrative supplied coverage: 20 m² with 10% extra is 22 m². If the selected product covers 5 m² per bag for your tile and joint configuration, buy 5 bags. This example does not specify a grout product.
Limitations
No universal grout density or default yield. Coverage must match product, tile and joint configuration.
Frequently asked questions
Why does grout coverage vary?
Tile dimensions, joint width, joint depth and product formulation change consumption. Use the exact product coverage chart for the selected tile and joint.
Does a tile area tell me grout bags?
It needs a coverage per bag or a matched consumption model as well. The calculator then applies the allowance once and rounds up to whole bags.
What does the worked example show?
Illustrative supplied coverage: 20 m² with 10% extra is 22 m². If the selected product covers 5 m² per bag for your tile and joint configuration, buy 5 bags. This example does not specify a grout product.
Which assumptions should I check before using the result?
No universal grout density or default yield. Coverage must match product, tile and joint configuration.
Sources
Sources explain the methods and any named product presets. Check your product label where coverage, yield or density differs.
Calculation documentation · Updated 2026-11-11 · Version 1.6.4. Estimates are planning aids. Confirm quantities, coverage and prices with your supplier before purchasing. Found an error? Report it.
Related calculators
All Floors & Walls calculatorsTile Calculator
Estimate tiles and boxes for a room from area, tile size and waste allowance.
Open →Thinset Calculator
Estimate thinset mortar bags from area and the product's coverage for your trowel.
Open →Flooring Calculator
Estimate flooring cartons from room area, waste and the manufacturer's coverage per carton.
Open →Wallpaper Calculator
Estimate wallpaper strips and rolls using real roll geometry — not just wall area.
Open →Siding Calculator
Estimate siding cartons from wall area, openings, waste and effective coverage.
Open →Brick Calculator
Estimate bricks for a single wall face using the face-plus-joint module.
Open →