Area of a Circle
Calculate Area of a Circle instantly. Free online calculator with the exact formula, a worked example, and metric units. No signup required.
Area of a Circle
Radiusm
Circle area
78.5398m²
Radius
5m
Diameter
10m
Circumference
31,42m
Area
78,54m²
More about: Area of a Circle
What it calculates
The “Area of a Circle” calculator computes Circle area in m² from 1 parameter: radius (m).
A core calculation for studying, engineering tasks, and checking solutions.
Example calculation
With parameters Radius = 5 m the result is 78.54 m² (π·r²).
How to use
- Enter the parameter values — every field above is adjustable with a slider.
- The result and related metrics are calculated automatically as you type.
- Use the additional metrics shown (if any) where needed.
- Copy the result or bookmark the page.