Circular Segment Area calculator.
Measure the area cut off by a straight chord of a circular boundary.
Your inputs
Use measurements from your plan and properties from your chosen product. Any prefilled values are illustrative.
A clear estimate starts here.
Enter your dimensions and product details to see the quantity and purchase breakdown.
Formula and assumptions
How this calculation works.
A segment includes the area between a chord and arc. A sector includes the triangle back to the centre.
A worked example
Illustrative inputs only. Product properties and design dimensions are not recommendations for your project.
- Radius
- 2 m
- Central angle, degrees
- 180
Segment area: 6.28 m²
Before you purchase
Use dimensions from your plan and properties from your chosen product. Any design spacing, section or fixing pattern must already be specified.
A segment includes the area between a chord and arc. A sector includes the triangle back to the centre.
Method: dimensional arithmetic and user-supplied specifications. Software checks: 2026-10-04. Calculation and review policy.