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Square Footage Calculator

Calculate room, wall or project area. Enter feet and inches or switch to metric.

Your project

Use one rectangle or add nonoverlapping areas. Required measurements are labeled.

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Calculator inputs
Length Required
Enter whole feet and inches less than 12. One blank component means 0.
Width Required
Enter whole feet and inches less than 12. One blank component means 0.

How this calculator works

A rectangular area is its length multiplied by its width. For an irregular floor plan, split the shape into nonoverlapping rectangles and add their areas.

Rectangle formulaArea = length × width

Assumptions and limitations

Measured area is separate from material procurement. Flooring and tile allowances depend on the selected product and installation layout. Paint needs wall measurements, not just a floor footprint.

Worked examples

One rectangle measuring 12 ft 6 in by 10 ft has an area of 125 ft². Two separate rectangles measuring 3.2 × 2.4 m and 1.5 × 0.8 m have a combined area of 8.88 m².

These are worked examples. Your result uses only the measurements you enter above.

Guides

Person measuring the width of an empty room with a tape measure stretched across the floor

How to Measure Square Footage of a Room

Learn how to measure room square footage accurately, including rectangular and irregular rooms, alcoves, closets and common measurement mistakes.

Paint roller, tray and open paint can beside a wall prepared for painting

Paint Coverage per Gallon: What the Numbers Really Mean

Understand paint coverage per gallon, how coats and wall condition change the estimate, and how to turn measured area into practical container quantities.