Bend Allowance Calculator
Estimate sheet-metal bend allowance from thickness, inside radius, K-factor and bend angle.
Technical calculator
Bend Allowance Calculator
Estimate sheet-metal bend allowance from thickness, inside radius, K-factor and bend angle.
Technical reference
Calculation basis and limits
Bend allowance depends on material condition, tooling, springback and the neutral-axis assumption represented by the K-factor.
Confirm the grade, standard, application conditions and supplier documentation before making a final engineering or purchasing decision.
Calculation method
Formula and worked example
Bend Allowance Calculator formula
Use the stated inputs and units to calculate an indicative result.
Worked example
With 2 mm thickness, 3 mm inside radius, K=0.33 and a 90° bend, the estimate is about 5.18 mm.
Quotation planning
How to use this estimate
Use the estimate for layout and early quoting. Validate the first article and adjust the K-factor to the actual press-brake setup.
Review limits
What can change the result
- Input rounding and unit choice can affect the displayed result.
- Material condition and tolerance may change the actual value.
- Keep the source values with the quotation record.
Request for quotation
Send your Bend Allowance Calculator requirement
Include the calculated result together with material grade, product form, dimensions, standard, application, quantity and destination.
- Grade and standard
- Product form and dimensions
- Application, quantity and destination
Frequently asked questions