KLOORACircle Calculator (Circumference and Area)
Find the circumference, area and diameter of a circle from its radius.
Quick answer: Circle Calculator (Circumference and Area): Find the circumference, area and diameter of a circle from its radius. Everything runs in your browser, so nothing you enter is uploaded or stored.
How to use Circle Calculator (Circumference and Area)
- Enter your values in the fields.
- The results update instantly as you type.
- Note or copy the numbers you need.
Features
- Instant results
- Free, no signup
- Runs in your browser, nothing is uploaded
- Works on phone and desktop
Frequently asked questions
What is the circumference formula?
Circumference = 2 x pi x radius. For a radius of 5 it is about 31.42.
What is the area of a circle?
Area = pi x radius squared. For a radius of 5 it is about 78.54.
Is the Circle Calculator (Circumference and Area) free?
Yes. It is free, needs no signup and works on any device.