Area Calculator

Area of a rectangle, square, circle, triangle or trapezoid — in square feet and square meters.

FREE TOOL · WORKS OFFLINE · NO SIGN-UP

Pick a shape, enter its measurements, and the area updates instantly below.

Area (square feet)
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Square meters
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Square yards
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📐 How to Use This Area Calculator

  1. 1.Pick the shape. Rectangle, square, circle, triangle or trapezoid — the input fields change to match the measurements that shape needs.
  2. 2.Choose your unit. Enter measurements in feet (the US standard), or inches, yards or meters — the calculator converts for you.
  3. 3.Enter the measurements. For a circle, the radius is half the diameter. For a trapezoid, you need both parallel sides plus the height.
  4. 4.Read the area three ways. Square feet for US projects, square meters for metric plans, square yards for carpet and landscaping orders.
  5. 5.Odd-shaped spaces? Split the space into rectangles and triangles, calculate each piece, and add the results together.

❓ FAQ

How do I calculate the area of a rectangle?

Multiply the length by the width. A room that is 12 ft long and 10 ft wide has an area of 12 × 10 = 120 square feet. The same formula works for any four-sided space with right-angle corners.

How do I calculate the area of a circle?

Use the formula π × r² — pi (about 3.1416) times the radius squared. A circle with a radius of 5 ft has an area of 3.1416 × 25 = 78.54 square feet. The radius is half the diameter, so measure across the circle and divide by two first.

How do I convert square feet to square meters?

Multiply square feet by 0.0929 (or divide by 10.764). For example, 120 square feet equals about 11.15 square meters. This calculator shows square feet, square meters and square yards side by side so you never have to convert by hand.

Is this area calculator free?

Yes — 100% free, no sign-up. Your measurements stay in your browser; nothing is uploaded, saved or tracked.

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