AreaCalc
Calculator

Exact radius squared times pi

Circle area calculator

Enter the radius to see both the exact coefficient of π and a separate decimal approximation.

Private browser calculation

Choose a shape and enter its dimensions

Stays on this page

Which shape are you measuring?

Measurement and result units

Required dimensions

Enter radius, not diameter.

m

AreaCalc handles ideal flat geometry from your measurements. It is not a land survey, GIS tool, material estimate, or irregular-shape measurement.