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.

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.

Calculate the area of any circle easily with our free online tool. Input radius, diameter, or circumference to get instant, accurate results with step-by-step explanations and visual …

This calculator will calculate the area of a circle given its diameter, using the famous formula area = pi times (d/2) squared. It supports different units such as meters, feet, and inches. Just type …

Calculate the area of a circle based on its radius or diameter. Fast, accurate, and completely free. Includes the calculation formula and practical examples.

Free online circle area calculator. Calculate the area of a circle using radius, diameter, or circumference with step-by-step solutions and visualizations.

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