Welding & Fabrication worked example

Press Brake Tonnage with material thickness squared of 0.03 in^2: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop material thickness squared to 0.03 in^2, then walk the calculation through step by step. Estimate press brake tonnage required from material thickness squared, bend length, material tensile factor, and die opening factor.

The inputs for this scenario

  • Material thickness squared: 0.03 in^2 (the input this scenario stresses; the baseline uses 0.06)
  • Bend length: 4 ft (held at the documented default)
  • Steel tensile-strength factor: 1 x (held at the documented default)
  • Die-opening factor (1/V): 0.5 1/in (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Combined load factor = material thickness squared × bend length × material tensile factor.
  • Press brake tonnage estimate works out to 0.06 tons at these inputs, and this is the headline figure for the scenario.
  • Base product works out to 0.12 value at these inputs.
  • Multiplier works out to 0.5 x at these inputs.
  • Factor A x B works out to 0.12 value at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where material thickness squared sits at 0.06 in^2 and the headline result is 0.13 tons, this scenario comes in 52% below the baseline at 0.06 tons.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to material thickness squared, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. It is an air-bending estimate; coining or bottoming can multiply the force several times over, and very small die openings drive tonnage and crack risk up sharply, so round up and stay within the die's rated capacity.

Results at a glance

  • Press brake tonnage estimate: 0.06 tons (headline result)
  • Base product: 0.12 value
  • Multiplier: 0.5 x
  • Factor A x B: 0.12 value

Run it with your numbers

  • To rerun this with your own numbers, open the live Press Brake Tonnage calculator, set material thickness squared to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.