The area of a circle calculator will compute the surface of a circle using a radius or a diameter.

Aug 1, 2025 · Use this circle calculator to find the area, circumference, radius or diameter of a circle. Given any one variable A, C, r or d of a circle you can calculate the other three unknowns.

Use the circle area calculator to calculate the area, diameter, circumference or radius of a circle.

Jul 2, 2025 · This calculator determines the area of a circle using either the radius or the diameter. You may also enter a custom value for π, or use the default value of 3.14159.

Calculate the area of any circle with this free online Circle Area Calculator. Includes step-by-step calculations, unit conversion, and circle visualization.

Area of circle calculator using formulas A = πr², A = πd²/4, and A = C²/4π. Calculate area of a circle instantly from radius, diameter, or circumference with step-by-step solutions.

Free online area of a circle calculator which helps you calculate the are of any circle, given its radius. Supports many different metrics such as in, ft, yd, mm, cm, meters, etc.

Free area of circle calculator with step-by-step solutions. Calculate circle area using radius or diameter. Includes formulas, examples, and practical applications for geometry and real-world problems.

Quickly find the area of any circle with our Circle Area Calculator. Enter the radius or diameter and get accurate results instantly—ideal for students, builders, and designers.

This calculator computes the values of typical circle parameters such as radius, diameter, circumference, and area, using various common units of measurement.