This easy-to-use tool helps you calculate essential circle properties, such as radius, diameter, circumference, and area, in just a few clicks. Whether you’re solving geometry problems, working on a project, or just curious, our calculator delivers accurate results instantly.
Radius (r): The distance from the center of the circle to any point on its edge.
Diameter (d): The distance across the circle, passing through the center. Formula: d = 2 × r.
Circumference (C): The total distance around the circle’s edge. Formula: C = 2 × π × r or C = π × d.
Area (A): The space enclosed within the circle. Formula: A = π × r².
A circle is a perfectly round shape where every point on its edge is equidistant from the center. Understanding the different properties of a circle—like its radius, diameter, circumference, and area—is fundamental in geometry and many real-world applications.
Choose What to Calculate: Select the property you want to calculate: radius, diameter, circumference, or area.
Enter Known Values: Input the values you know, such as the radius or diameter, into the calculator.
Click Calculate: Get instant, accurate results for your desired calculation.
Accurate and Fast Results: Perform complex circle calculations in seconds.
User-Friendly: Simple interface makes it easy for anyone to use.
Multiple Calculations: Compute radius, diameter, circumference, or area based on the information you have.
Educational Tool: Great for students learning geometry or anyone working with circles in design, construction, or art.
Find the Area: If you know the radius of a circle is 5 cm, input it into the calculator, and the area will be calculated as approximately 78.54 cm².
Find the Circumference: For a circle with a diameter of 10 meters, the circumference will be about 31.42 meters using our calculator.
Q: Can I calculate the radius if I only know the circumference?
A: Yes! Simply input the circumference, and our calculator will compute the radius for you.
Q: Is this calculator free to use?
A: Absolutely! Our Circle Calculator is free with no limitations.
Q: Can I use this calculator on mobile devices?
A: Yes! Our tool is optimized for both desktop and mobile, so you can use it anywhere.