Square footage and square meters calculator

Calculate the area of a rectangular planning zone and see the equivalent in both unit systems.

Direct answer

Multiply measured length by measured width. Split irregular plans into non-overlapping shapes, calculate each shape, and sum them; do not count wall area, voids, or overlapping shapes twice.

Interactive tool

Enter your measurements

Enter valid measurements and select Calculate.

Transfer these inputs to a new local editor project

Formula

Area = length x width. 1 square foot = 0.09290304 square meter.

Worked example

A 24 ft by 30 ft rectangle is 720 sq ft, equivalent to about 66.89 sq m.

Assumptions

The measured zone is rectangular.
Length and width use the same unit system.
Dimensions refer to the same face or boundary convention.

Caveats

Gross, net, conditioned, and finished area are different definitions.
Irregular and curved plans need separate shapes.
The result does not establish zoning, appraisal, permit, or listing area.

Primary references

Guide for the Use of the International System of Units (SI)National Institute of Standards and Technology; accessed 2026-08-02.

Understand and continue

How to draw a floor plan to scale

Turn field measurements into a consistent plan without letting rounding errors accumulate.

Read supporting guide

One-bedroom small-home concept

A compact single-story rectangle organized around one wet core and a combined living area.

Open starting concept

Planning quantity, not construction directionThis calculator does not verify codes, specifications, structure, utilities, product suitability, purchasing, pricing, installation, or safety. Verify the result and all project decisions with qualified local professionals.