Radius from Chord and Rise calculator.
Infer a circular radius when only a straight chord and arc rise can be measured.
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.
Assumes an actual circular minor arc. The radius is an inverse geometric measurement, not proof that an irregular curved edge is circular.
A worked example
Illustrative inputs only. Product properties and design dimensions are not recommendations for your project.
- Measured chord width
- 2 m
- Minor-arc rise above chord
- 1 m
Inferred circular radius: 1 m
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.
Assumes an actual circular minor arc. The radius is an inverse geometric measurement, not proof that an irregular curved edge is circular.
Dimensions, quantities, prices, timing and product properties are supplied by you. This tool does not select construction specifications or assess structural, electrical or hydraulic suitability.
Method: dimensional arithmetic and user-supplied specifications. Software checks: 2026-10-04. Calculation and review policy.