Tile quantity, waste and purchasing guide
Estimate tile quantity using installation area, tile dimensions, grout joint, cut allowance, box size and price.
Use consistent internal dimensions and verify product, supplier and project requirements before relying on the purchasing result.
How to use this calculator
- Select the calculation: Choose the applicable shape and unit system.
- Measure the scope: Enter finished internal or installed dimensions as labeled.
- Review assumptions: Confirm allowance, packaging, fill or product inputs where applicable.
- Verify the result: Compare the result with project documents and current supplier information.
Formula and variables
The module includes tile dimensions plus the entered joint; tiles and boxes are rounded upward.
Tiles = area ÷ module area × (1 + allowance %)- Dimensions — Measured geometry
- Positive dimensions entered in the displayed units.
Worked example
A 10 ft × 10 ft area uses 12 in square tiles with 10% allowance.
- Project geometry
- As described in the example
- Tiles = area ÷ module area × (1 + allowance %)
- The module includes tile dimensions plus the entered joint; tiles and boxes are rounded upward.
Result: Plan 110 tiles, then round upward to whole boxes.
Treat the result as a transparent planning quantity, not a design approval or supplier guarantee.
Understanding your results
Calculated quantity
The formula result before product-specific adjustments unless stated.
Purchasing result
A rounded or adjusted quantity based on the entered planning assumptions.
Assumptions
- The area is rectangular.
- All tiles and joints use consistent dimensions.
Limitations
- Pattern repeats, borders and layout optimization are excluded.
- Substrate preparation and installation design are outside scope.
Common mistakes
- Ignoring pattern and cut loss.
- Mixing feet with inches.
- Buying across incompatible production lots.
Practical use cases
Preliminary takeoff
Create a transparent quantity for scope and budget review.
Supplier discussion
Bring dimensions and assumptions to confirm product quantities and rounding.
Planning and decision guide
Measure consistently
Record measurement boundaries and units so the estimate can be reproduced.
Confirm current requirements
Use approved project documents and current manufacturer or supplier information.
Frequently asked questions
Is this result exact?
It is exact for the entered idealized geometry, but field conditions and product rules can change the practical quantity.
Can I mix units?
No. Enter every dimension using the units shown for the selected system.
Does this replace project design?
No. It is a planning calculation only.
Sources and review
- TCNA Handbook for Ceramic, Glass, and Stone Tile Installation — Tile Council of North America. Accessed 2026-08-03.
Reviewed 2026-08-03.