Semicircle area
Geometry / FREE CALCULATOR
Find the area of half a circle.
Your answer starts here.
Enter your values and select Calculate to see the result and any available breakdown.
How to use this calculator
- Enter radius. Use the unit shown beside the field.
- Select Calculate and review the result. Select Reset to restore the example inputs.
How the calculation works
3.141592653589793*Radius*Radius/2
Worked example
Radius = 2. Result: 6.28319 square units.
Understand your result
Find the area of half a circle. The result is expressed in square units.
Assumptions and limitations
Does not include an additional rectangular section. Results are rounded for display.
Questions about this tool
What does this tool calculate?
Find the area of half a circle.
What should I check before using the answer?
Does not include an additional rectangular section.
Related guides
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