How to use this calculator
A sector is the wedge-shaped part of a circle cut out by two radii and an arc.
The method
Area = angle/360 × πr²
Enter your values in the labeled fields and choose Calculate. The result panel shows the answer and supporting values when useful.
WORKED EXAMPLE INPUT
Radius: 10, Central angle (degrees): 60
Select Calculate to evaluate these example values.
Scope and limitations
Angle is entered in degrees from 0 through 360.
Common questions
Can I use different units?
Use consistent units unless this page is a unit converter. The result follows the units implied by the inputs.
Are results exact?
Displayed values may be rounded. Keep extra precision for important follow-up calculations.
Methods & verification
Formulas use standard mathematical definitions and fixed unit factors where applicable. See our methodology for numerical conventions, rounding, privacy, and limitations.