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What does the Tile quantity and grout calculate?
How many tiles and how much grout does the job need? This calculator uses surface area, tile length, tile width, waste allowance, and grout coverage to estimate tile order immediately in your browser.
With the values currently entered, the result is 225 tiles — tile quantity. It also shows order area, grout, and waste allowance.
How to use the Tile quantity and grout
- Replace the example values with your own numbers.
- Review the result and supporting figures as they update automatically.
- Check the formula and assumptions before using the estimate for a decision.
Inputs used
- Surface area — entered in m²
- Tile length — entered in cm
- Tile width — entered in cm
- Waste allowance — entered in %
- Grout coverage — entered in m²/kg
Tile quantity and grout formula
Area with waste ÷ tile area; grout uses covered area ÷ coverage
Assumptions
- Tiles are rectangular.
- Manufacturer grout coverage overrides this estimate.
Practical guide
Tile quantity and grout example and edge cases
How many tiles and how much grout does the job need? Let's use a concrete example, then look at the assumptions that can move the answer.
Example: A practical tile quantity and grout scenario
For this example, use surface area of 18 m², tile length of 30 cm, tile width of 30 cm, waste allowance of 12 %, and grout coverage of 4 m²/kg. These are starting values, so replace them with numbers that match your situation.
- Surface area
- 18 m²
- Tile length
- 30 cm
- Tile width
- 30 cm
- Waste allowance
- 12 %
- Grout coverage
- 4 m²/kg
Calculated result225 tilestile quantity
Start with tile quantity. Then check order area, grout, and waste allowance to understand what sits behind the main result.
Example results use the default display profile. The calculator above follows your selected country and units.
How to read the result
- Read the main result first. The supporting figures for order area, grout, and waste allowance explain how the estimate is built.
- The method is Area with waste ÷ tile area; grout uses covered area ÷ coverage. Keep the units consistent and use values from the same time period.
Edge cases worth checking
When surface area is unusual
Tiles are rectangular. Double-check this input before relying on the result.
When grout coverage is uncertain
Manufacturer grout coverage overrides this estimate. Run a lower and higher value to see a useful range.
What changes the result most
Surface area
Measure surface area with the same unit shown beside the input. Convert first if your source uses another unit.
Tile length
Measure tile length with the same unit shown beside the input. Convert first if your source uses another unit.
Tile width
Measure tile width with the same unit shown beside the input. Convert first if your source uses another unit.
Try a different scenario
Small changes show whether the answer is stable or sensitive.
Surface area: 10% lower
16 m²200 tilestile quantity
Surface area: 10% higher
20 m²249 tilestile quantity
Tile length: 10% higher
33 cm204 tilestile quantity
Common mistakes
Check surface area
Tiles are rectangular. Make sure this matches the number you enter.
Keep grout coverage consistent
Manufacturer grout coverage overrides this estimate. Use the same units and time period throughout the calculation.
Do not rely on one tile quantity and grout scenario
Run a cautious case and an optimistic case. The range is often more useful than one exact-looking number.
Use this result well
How many tiles and how much grout does the job need?
Confirm measurements, pack sizes, and product instructions before ordering materials.