Area Calculator
Rectangle, triangle and circle measurements.
Rectangle, triangle and circle measurements.
Rectangle, triangle and circle measurements. Fill in the fields above and the result updates instantly, together with the formula behind it.
Rectangle = length × width; triangle = base × height / 2; circle = π × radius²
A room 5 m by 4 m has an area of 20 m².
All dimensions use the chosen length unit. The result is in square units.
Rectangle = length × width; triangle = base × height / 2; circle = π × radius². Example: A room 5 m by 4 m has an area of 20 m².
You enter: Shape; Length unit; Length / base; Width / height; Radius. An example value is shown in each empty field, and the result appears as soon as the numbers are valid.
One square meter is about 10.764 square feet. Pick the length unit in the calculator and read the area in that unit squared.
Yes. Use Copy to copy the result or full example. Share creates a link that puts your chosen values into the URL fragment so another person can reproduce the calculation. Your named saves and recent history stay in your own browser.