Square Footage & Area Calculator

Measure up a project in seconds. Add each room's length and width to get its area and the total across all rooms — in square feet or square metres. Add a price per unit (and an optional waste %) to estimate what flooring, carpet, tile or paint will cost.

Tips

• Odd-shaped rooms: split them into rectangles and add each as a separate row.
• Waste allowance covers offcuts and pattern matching — 10% is a common rule of thumb, more for diagonal layouts or busy patterns.
• Paint: measure wall length × height instead of floor dimensions, and check the coverage on the tin (often quoted per litre or gallon).

More calculators: unit converter, percentage calculator, and the full tools list.