Geometry
Circle Calculator
Circle Calculator is free to use. Enter your figures below and the result updates as you type. Use it for planning; it is an estimate, not advice.
About the Circle Calculator
Area = π × r². Circumference = 2 × π × r. Diameter = 2 × r.
Measure the radius or diameter accurately, because the area depends on the square of the radius.
How to use the Circle Calculator
- Enter each figure in the boxes above, using the same currency and time units.
- The result updates as you type. Press Calculate to refresh it at any time.
- Change one figure at a time to see how much it moves the result.
Frequently asked questions
What is the Circle Calculator used for?
Measure the radius or diameter accurately, because the area depends on the square of the radius.
How accurate is the Circle Calculator?
It applies standard formulas to the figures you enter. Real results depend on actual rates, fees, taxes and timing, so treat the output as an estimate and confirm with your bank or adviser.
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