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DEW Home
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Bend Allowance / Flat Pattern Calculator
Decision Tools
Bend Allowance / Flat Pattern Calculator
Free engineering calculator - no signup, runs in your browser.
DEW Machine Shop Tools
Bend Allowance / Flat Pattern
Inputs
Material Thickness T (mm)
Inside Bend Radius Ri (mm)
Bend Angle (degrees of bend)
K-Factor
~0.33 tight radii → 0.45 generous; dial in from a test bend
Flange A / Flange B to bend (mm)
CALCULATE
Readout
FLAT LENGTH
—
mm
BEND DEDUCTION
—
mm
BEND ALLOWANCE / SETBACK
—
Flat blank = flange A + flange B − bend deduction (measured to the mould line).
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