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Sheet-metal bend flat planner
Calculate bend allowance, setback, deduction and flat length from shop dimensions.
01Enter your values
Runs in your browser02Sheet-metal bend flat planner
Runs in your browser
How it works
Calculate bend allowance, setback, deduction and flat length from shop dimensions.
BA = θ(R + KT); OSSB = (R + T)tan(θ/2); BD = 2OSSB − BA; flat = A + B − BD
Runs in your browser
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Inputs are processed on this page and are never sent to a server.
About this tool
Use tool ↑Calculate bend allowance, setback, deduction and flat length from shop dimensions.
Uses outside leg dimensions, inside radius, thickness, bend angle and your proven K-factor. Validate the K-factor with the actual material, tooling and process.
How to use it
- Enter your values
Unit for every dimension · Thickness · R · Angle · K · A · B
- Calculate / generate
Calculate bend allowance, setback, deduction and flat length from shop dimensions.
- Result
77.131194 mm
Calculation method
BA = θ(R + KT); OSSB = (R + T)tan(θ/2); BD = 2OSSB − BA; flat = A + B − BD
Sheet-metal bend flat planner
- Unit for every dimension
- mm
- Thickness
- 1.5
- R
- 2
- Angle
- 90 °
- K
- 0.42
- A
- 50
- B
- 30
Result
77.131194 mm
Frequently asked questions
Is the K-factor selected automatically?
No. Enter the factor established for the material and bending setup; the tool performs geometry only.
Where does my data go?
Calculations run on your device. Form inputs are not sent to a server.