Punch Force Calculator (Sheet Metal Stamping)

Your details

Choose the punch profile. The calculator works out the perimeter for standard shapes.
Outer diameter of the punched hole.
mm
Select the sheet metal material. Shear strength is loaded automatically; choose Custom to enter your own.
Thickness of the sheet being punched.
mm
Multiply the theoretical force by this factor to allow for tool wear, die misalignment and material variation. Industry guideline is 1.2-1.5; use 1.0 for the bare theoretical force.
Punching forceMedium press (50-200 kN)
57.73kN

Required press force including the safety factor

Punching force12,977lbf
Punching force5.89metric ton-force
Perimeter62.83mm
Shear strength245N/mm²
Theoretical force (no factor)46.18kN
Die clearance (min)0.15mm
Die clearance (max)0.3mm
57.73 kN
Light press<50Medium press50-200Heavy press200-600Extra-heavy press600+

Press capacity needed: 57.7 kN (0.01 metric tons-force).

  • Theoretical (ideal) force is 46.2 kN. The safety factor of 1.25x raises the required press capacity to 57.7 kN to allow for tool wear and material variation.
  • For Mild steel at 3.00 mm, a die clearance of 0.150-0.300 mm per side (5-10% of thickness) is recommended. Too little clearance increases force and burrs; too much causes fracture-line offset.

Next stepCross-check the press tonnage rating against this figure with at least 10% headroom. Rated tonnage is typically the maximum at bottom dead centre.

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