Sheet Metal Bend Allowance Calculator

Calculate bend allowance using bend angle, radius and K-factor.

Live concept view — geometry scales with the entered design condition.

Calculate bend allowance using bend angle, radius and K-factor.

PRELIMINARY RESULT

Bend allowance5.749 mm

Formula: BA = θ(rad) × (R + Kt)

Bend allowance is calculated along the neutral axis using the entered K-factor.

FORMULA VERIFICATION

Reference: Bralla, Handbook of Manufacturing Processes; approved bend-test data controls K-factor.

Internal unit basis: radians, mm. Outputs: mm.

Valid conditions: 0 < angle < 180°, 0 < K < 1, positive radius/thickness.

Limitations: One bend only; actual K-factor, springback and reliefs require shop data.

Design inputs