Tile Calculator
Work out how many tiles you need for a floor or wall, including the cut allowance.
Last updated · View algorithm, constants and default inputs (JSON)
About this calculator
Choose dimensions or enter the surface area directly. Apply the waste percentage to the unrounded area-based tile count, then round tiles up once; round boxes up afterwards.
Worked example
calculated with the default values below
Area length 12 ft · Area width 10 ft · Tile length 12 in · Tile width 12 in · Cut allowance 10 % · Dimensions or direct area Dimensions · Surface area 120 sq ft · Tiles per box 10 · Price per box 35 $ Tiles with cut allowance 132 · Surface area 120.0 sq ft · Area per tile 1.000 sq ft · Tiles needed 120 · Tiles per square foot 1.00 pcs · Boxes to buy 14 · Cost 490.00 $ · Extra tiles beyond waste allowance 8 · Nominal tile coverage per box 10.00 sq ft
Method and assumptions
Choose dimensions or enter the surface area directly. Apply the waste percentage to the unrounded area-based tile count, then round tiles up once; round boxes up afterwards. Leftovers are supplied tiles minus the waste-adjusted requirement. This is an area estimate, not a layout, grout-joint or cutting plan. Confirm box coverage and the installer’s allowance.
General background references
Disclaimer
These calculators provide planning estimates only. Building codes, wiring regulations and safety requirements differ by country and change over time, and nothing here replaces a licensed professional or a permit. For structural, electrical or gas work, follow local code and have the installation inspected.
Implementation source
This record describes the implementation used by this page. It is not independent validation. External references, when available, support only the stated formula or definition; estimates and custom rules retain their own assumptions.
Formula and variables
tile area = length_in × width_in/144; required = ceil(surface/tile area × (1 + waste/100)); boxes = ceil(required/tiles per box)
This is an area estimate, not a layout, grout-joint or cutting plan. Confirm box coverage and the installer’s allowance.
Frequently asked questions
Why does the cut allowance add tiles beyond the raw area math?
Choose dimensions or enter the surface area directly. Apply the waste percentage to the unrounded area-based tile count, then round tiles up once; round boxes up afterwards. Leftovers are supplied tiles minus the waste-adjusted requirement. This is an area estimate, not a layout, grout-joint or cutting plan. Confirm box coverage and the installer’s allowance.