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Press brake air bending force and tonnage calculator


This is our calculator to calculate the force of press brake necessary for your application.
  • Used only for air-bending deformation technique
  • Only theoretical values - for more realistic values please use the manual of your press brake or CNC software calculations
  • This calculator just for main information - no responsibility for information use and possible problems
  • You can use and input manually tensile strength for non-indicated materials
  • Recommended die opening V - general sizes available for dies on the market as standard. Sometimes use of customized and special die opening could be more effective
  • Parameter Fm - just to indicate force/meter which is important for bending tooling choose

Recommended V: - mm

Internal radius R: 0 mm

Minimal flange h: 0 mm

Bending force F: 0 tons

Bending force per meter Fm: 0 tons/m

Press brake air bending force calculator

Formulas used

  • Calculation of V-die opening (parameter V):
    V=S*6 for thickness less 0,7 mm;
    V=S*8 for thickness 0,71 - 6 mm;
    V=S*10 for thickness 6,01 - 10 mm;
    V=S*12 for thickness 10,1 - 14 mm;
    V=S*14 for thickness from 14 mm and higher
  • Calculation of internal radius (parameter R): R = (5*V)/32
  • Calculation of minimal flange (parameter h):
    30° - h = 2*V
    45° - h = 1,38*V
    60° - h = 1,06*V
    90° - h = 0,78*V
    120° - h = 0,64*V
    135° - h = 0,60*V
    165° - h = 0,56*V
  • Calculation of bending force (parameter F): F=(1,42 * TSS * (S*S) * L)/(1000*V)