K-Factor Calculator
Determine K-factor from material type, thickness, bend radius ratio, and bending method for accurate flat patterns.
Inputs
mm
mm
Results
K-Factor
0.34
R/t Ratio1.33
Neutral Axis Offset0.5 mm
Neutral Axis Radius2.5 mm
Bend Allowance at 90°3.93 mm
Min Bend Radius0.75 mm
How to Use This Calculator
- Select your material type (soft aluminum, copper, mild steel, stainless, or hard brass) from the preset list.
- Enter material thickness and inside bend radius.
- Review the recommended K-factor and its effect on neutral axis position.
- Verify the K-factor with a test bend: measure actual developed length and back-calculate K.
- Use a lower K-factor for harder materials and tighter radii -- the neutral axis moves inward under compression.
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