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The area of a circle calculator helps you compute the surface of a circle given a diameter or radius. Our tool works both ways — no matter if you're looking for an area-to-radius calculator or a radius to the area one, you've found the right place .
Area of a Circle Calculator. Use this calculator to easily calculate the area of a circle, given its radius in any metric: mm, cm, meters, km, inches, feet, yards, miles, etc.
Calculate the area of a circle given the radius, diameter, or circumference. Plus learn the formulas and steps to find a circle's area.
Calculate the area, circumference, radius and diameter of circles. Find A, C, r and d of a circle. Given any 1 known variable of a circle, calculate the other 3 unknowns.
This widget calculates the area (A) of a circle. Input the radius (R) in the text field. Remember, the radius is the distance from the center of the circle to the edge. It's also half of the diameter.
This calculator computes the values of typical circle parameters such as radius, diameter, circumference, and area, using various common units of measurement.
This circle calculator finds c (circumference), d (diameter), a (area), and r (radius) of a circle.