Brick Arch Calculator
Calculate the radius, voussoir count, skewback angle, and arc length for segmental and semicircular brick arches.
Inputs
in
in
in
in
Results
Arch Radius
24.25 in
≈ 7 credit cards
Voussoir Count
11 bricks
Skewback Angle47.9°
Arc Length40.57 in
Spring Point Offset16.25 in
How to Use This Calculator
- Enter the arch span width (the clear opening) in inches or feet.
- Enter the rise height from the spring line to the crown of the arch.
- Input the brick width (the dimension perpendicular to the arch ring).
- Review the brick count, skewback angle, and joint width at the intrados and extrados.
- Have a licensed mason verify the structural adequacy before construction.
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