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⭕ Circle Calculator

Calculate circle area, circumference, diameter, radius, and arc length — given any single measurement.…

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Free to embed on your website. Courtesy of JustCalculators.app.

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Circle Calculator — Guide & Formulas

Circle formulas: Area = πr². Circumference = 2πr = πd. Diameter = 2r. Given any one measurement, all others can be derived. π ≈ 3.14159265. A unit circle (radius = 1) has area π and circumference 2π, and is foundational in trigonometry.

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