Flooring & Tiling calculator
Floor Area Calculator
Calculate floor area from room length and width in metric or imperial units.
Calculate floor area from room length and width in metric or imperial units. Keep the dimensions and units consistent, then check the figures that describe the product or layout you will really use. In this calculation, measurement accuracy can change the answer materially. For L-shaped or irregular surfaces, split the project into simple rectangles, calculate each area and add them together.
What you need to enter
The Floor Area Calculator uses the following project information to calculate the result.
- Length
- Width
Calculator result
Area
How the Floor Area Calculator works
To produce area, the Floor Area Calculator applies area = length × width. The engine is configured for floor area from room dimensions, not as a generic text estimate. Check measurement accuracy, since an incorrect value there can materially change the result.
Floor Area Calculator worked example
Floor Area Calculator example: A room 5.2 m × 3.9 m has 20.28 m² of floor area. Keep that geometric area unrounded when passing it into flooring, tile or underlay calculations, then add the material-specific waste allowance there. The worked figure becomes more useful when measurement accuracy is taken from the real product or site rather than a generic default.
Important calculation assumptions
For floor area, measure the finished footprint at floor level and split L-shaped rooms into simple sections. Keep the geometric area precise, then apply flooring- or tile-specific waste in the relevant material calculator.
Frequently asked questions
What should I measure before using the Floor Area Calculator?
Measure finished length and width in the same unit. For irregular shapes, split the surface into simple sections and add them. On this page, the measurements are used specifically for floor area from room dimensions.
Should I use a default value for measurement accuracy in the Floor Area Calculator?
In the Floor Area Calculator, errors in measurement accuracy can materially affect the result. For L-shaped or irregular surfaces, split the project into simple rectangles, calculate each area and add them together.
What precision should I keep from the Floor Area Calculator?
Keep the area reasonably precise and use it as the input to the relevant material calculator. Add waste only at the material stage, not to the geometric area itself. That is the practical way to carry the Floor Area Calculator result into the next step.