Square Footage Calculator
Measure the area of a room or space. Enter the dimensions (and how many identical areas) to get square feet, yards, and meters — plus total cost if you add a price.
Example: with Shape Rectangle · Dimension unit Feet (ft) · Length 12 ft · Width 10 ft → Total square feet: 120.0 sq ft.
- Square yards13.33 sq yd
- Square meters11.15 sq m
Computed by the calculator below using its default values. Change any input to see your own numbers.
3D area · drag to rotate
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Check it outMeasuring odd shapes
Square footage is simply length times width. Use the Shape selector to switch to a rectangle border (like a garden bed or picture-frame edge), a circle, a circle border / annulus (a ring shape, such as a round patio around a pool), a triangle, or a trapezoid — each with its own dimension fields and a choice of ft, in, yd, m, or cm. For a truly irregular room, split the space into rectangles, calculate each, and add them up — the 'number of areas' field helps when they're identical. Multiply by a price per square foot to budget flooring, tile, paint, or rent.
How it’s calculated
Area = length × width × number of areas. 1 sq yard = 9 sq ft; 1 sq metre ≈ 10.76 sq ft.
Other shapes: rectangle border area = outer area − inner area (inner dims shrink by 2× the border width on each side); circle area = π×(diameter/2)²; circle border/annulus area = outer circle area − inner circle area (inner radius = outer radius − border width); triangle area = base×height/2; trapezoid area = (base1+base2)/2×height. Non-feet dimension units are converted to feet first (in÷12, yd×3, m×3.28084, cm×0.0328084) so every shape's area lands in square feet before the sq yd / sq m / cost conversions.
Results update as you type and are estimates, not professional advice — verify important decisions with a qualified professional.
Common mistakes
- Measuring an irregular room as one rectangle.
- Mixing feet and inches in the dimensions.
Frequently asked questions
How do I handle an irregular room?
Divide it into rectangles, compute each separately, and sum the results.
How many square feet in a square yard?
Nine. One square yard = 3 ft × 3 ft = 9 square feet.
Can I price materials with this?
Yes — enter a price per square foot to get a quick material or rent estimate.