The Segmental Arch calculator will return the radius for the given arch width and rise. The segmental arch is semicircular or an arch that is less than a semicircle.
Arch Width
Enter the width of the opening.
Arch Rise
Enter the rise-height of the opening.
- Length/Dimensions Input Menu Mode
- Imperial/English Inch base 12 —— default.. use American standard pitches over 12.
- Metric 300mm base —— 300mm is 11.81102 inches, similar usage to the American framing squares printed in inches.
- Decimal Inch base 10 —— use this option when working with tangents or using the Chappell Master Framing Square multiply the tangent of the angle by 10
The output mode selection can be completely different from the input mode.
- Length/Dimensions Output Menu Mode
- Imperial/English Inch base 12 —— default.. use American standard pitches over 12.
- Metric 300mm base —— 300mm is 11.81102 inches, similar usage to the American framing squares.
- Decimal Inch base 10 —— use this option when working with tangents or using the Chappell Master Framing Square
