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Calcimator

Notch & Relief Calculator

Calculate corner relief dimensions for sheet metal bend clearance including round, rectangular, and slot relief types.

Inputs

mm
mm
°

Results

Recommended Relief Width

4.38 mm

Recommended Relief Depth4.2 mm
Round Relief Diameter7 mm
Minimum Relief Width3.5 mm
Bend Line Offset2.75 mm
Min Bend-to-Bend Spacing6 mm
Relief Area Removed38.48 mm²
How to Use This Calculator
  1. Enter material thickness, inside bend radius, and bend angle.
  2. Select relief type (round drilled hole, rectangular slot, or V-notch).
  3. Review relief size, minimum relief diameter, and relief position relative to the bend line.
  4. Relief cuts prevent tearing at bend ends -- always required when bending to the edge of a flange.
  5. Round relief holes reduce stress concentration better than rectangular slots for ductile materials.
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