Circle Calculator
Solve any property of a circle with one input. Find radius, diameter, circumference, and area, plus sector calculations and arc length insights.
Circle Calculator
Calculate radius, diameter, circumference, and area from any single value
How to Use Circle Calculator in 3 Easy Steps
1
Step 1
Select the type of value you currently have (e.g., Area).
2
Step 2
Input the numeric value for that property.
3
Step 3
Optionally enter a central angle (in degrees) if you need sector slice measurements.
Frequently Asked Questions
The area is calculated using the formula A = πr².
The circumference is π times the diameter (C = πd).
Yes, by entering a "Central Angle", the tool will calculate the Sector Area (the "slice") and the Arc Length.