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 radius — each field above is adjustable with a slider.
- Circle area (m²) is calculated automatically as you type.
- Check the worked example below to see the formula applied to real numbers.
- Copy the result or bookmark this calculator.
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FAQ
How is Area of a Circle calculated?
The Area of a Circle calculator computes Circle area (in m²) from radius. Enter your values above and the exact formula is applied instantly; a worked example with real numbers is shown below.
Is the Area of a Circle calculator free?
Yes. It is completely free, needs no signup, runs entirely in your browser, and sends no data to any server.
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