How the calculation works

Bend allowance = angle × π ÷ 180 × (inside radius + K × thickness).

Example

A 90° bend with 0.125-inch radius, 0.063-inch stock, and K=0.33 uses about 0.229 inch.

When to use this calculator

Use it when laying out brackets, pans, enclosures, and formed sheet parts.

Results are planning estimates. Verify critical dimensions, machine settings, material specifications, and local code requirements before work begins.