Construction

Punch Force Calculator

Find the force to punch a hole.

Perimeter (π·D)

Material thickness

Shear strength (MPa)

Calculated Output

Punch force (kN) 82.425

Punch force 9.265

Formula: force = perimeter × thickness × shear strength

Step-by-Step Breakdown

1. Values used:

2. Perimeter (π·D) = 78.5

3. Material thickness = 3

4. Shear strength = 350 MPa

6. Punch force = 82.425kN

7. Punch force = 9.265

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The math behind it

force = hole perimeter × material thickness × shear strength. Divide the result by 1,000 for kN.

25 mm hole (π×25=78.5), 3 mm steel (350 MPa) → ~82 kN.

Safety factor?

Add 20–30% extra for press capacity.