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Sheet-Metal Bend

Bend allowance BA = (π/180)·angle·(R + K·T); bend deduction BD = 2·(R+T)·tan(angle/2) − BA; flat length = flange A + flange B − BD. Angle = bend angle (90 for a right angle).

Calculator

Thickness T (mm)

Inside radius R (mm)

Bend angle (°)

K-factor

Flange A (mm)

Flange B (mm)

Bend allowance

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Bend deduction

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Setback

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Flat length

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K-factor varies with material/tooling — verify on a test bend. A helper, not a substitute for engineering judgment.