---
title: "Power Press Tonnage Calculator"
url: https://basantgroup.com/power-press-tonnage-calculator/
type: page
date: 2026-08-08
modified: 2026-09-25
markdown_url: https://basantgroup.com/power-press-tonnage-calculator.md
author: "admin"
---

# Power Press Tonnage Calculator

Power Press Tonnage Calculator | Basant Mechanical Works

 Engineering Tool
 

# Power Press Tonnage Calculator

 Work out the tonnage required for punching, blanking or bending a job — then see which Basant power press (20 to 1000 ton) is rated to run it.

 **Basant Mechanical Works** — Since 1957
 ISO 9001:2015 Certified
 Ludhiana, Punjab, India
 Not sure of your exact figure? Send us your part drawing — our engineers will size the press for you, free.
 [WhatsApp your drawing →](https://wa.me/919780200007?text=Hi%2C%20I%27d%20like%20help%20sizing%20a%20power%20press%20for%20my%20part.)
 
 Operation
 Punch / Blank
 V-Bend
 Blank / Cut-out shape
 Circle
 Rectangle
 Custom perimeter
 Diameter (mm)
 
 Length (mm)
 
 Width (mm)
 
 Total cut perimeter (mm)
 
 Bend length (mm)
 
 Die (V) opening (mm)
 
 Material thickness (mm)
 
 Material
 
 Mild Steel — shear ~30 kg/mm²
 Mild Steel (higher grade) — shear ~40 kg/mm²
 Stainless Steel 304 — shear ~55 kg/mm²
 Aluminium — shear ~18 kg/mm²
 Brass — shear ~25 kg/mm²
 Copper — shear ~22 kg/mm²
 Custom value…
 
 Custom shear strength (kg/mm²)
 
 Safety margin
 
 25%
 Calculated tonnage required
 0.0TON
 Raw force before margin: 0.0 ton
 02505007501000+ ton
 Recommended Basant press
 50 Ton Class
 [View matching presses →](https://basantgroup.com/power-presses/)
 Formula in use: Tonnage (ton) = Perimeter (mm) × Thickness (mm) × Shear strength (kg/mm²) ÷ 1000, then + safety margin.
 

 
 

## How Press Tonnage Is Calculated

 Tonnage is the force a power press must deliver to punch, blank, or bend a given material without straining the frame, die, or motor. Selecting a press below the required tonnage risks incomplete cuts, die damage, and frame stress; selecting one far above it wastes power and increases per-part cost. Basant Mechanical Works has been sizing presses for Indian sheet metal, automotive, and hardware manufacturers since 1957 — the calculator above uses the same working formulas our engineers use during machine selection.

 Punching / Blanking
 Tonnage = (Perimeter × Thickness × Shear Strength) ÷ 1000
 Perimeter is the total length of the cut edge in millimetres (for a circle: π × diameter; for a rectangle: 2 × (length + width)). Shear strength depends on material — mild steel typically runs 30–40 kg/mm², stainless steel around 55 kg/mm², aluminium as low as 18 kg/mm².

 V-Bending
 Tonnage = (Bend Length × Thickness² × Shear Strength) ÷ (1.42 × Die Opening × 1000)
 For bending operations, tonnage depends on the die opening (V-width) rather than perimeter — a narrower die requires proportionally more force for the same bend length and thickness.

 **Always add a safety margin.** Material thickness tolerance, die wear over thousands of strokes, and the press not delivering 100% rated force through the full stroke all reduce effective capacity over time. A 20–30% margin above the calculated figure is standard practice — round up to the next available press size rather than down.

 

## Basant Power Press Range by Tonnage

 
 Tonnage rangeTypical useRecommended series

 20 – 50 tonLight punching, small brackets, electrical components[C Type Power Press](https://basantgroup.com/power-presses/c-type-power-press/)

 50 – 150 tonGeneral stamping, automotive brackets, washers[H Frame Power Press](https://basantgroup.com/power-presses/pillar-type-power-presses/)

 150 – 300 tonDeep drawing, heavier stamping, forming[Pneumatic Power Press](https://basantgroup.com/power-presses/pneumatic-presses/)

 300 – 1000 tonForging, hot stamping, billet shearing[Forging Press](https://basantgroup.com/power-presses/forging-presses/)

 

 

## FAQ

 

### How do I calculate press tonnage for punching?

 Multiply the cut perimeter (mm) by material thickness (mm) by the material's shear strength (kg/mm²), then divide by 1000. Add a 25–30% safety margin and round up to the next standard press size.

 

### What tonnage press do I need to punch a 50mm hole in 2mm mild steel?

 Perimeter = π × 50mm = 157mm. 157 × 2 × 40 kg/mm² ÷ 1000 = 12.6 tons raw. With a 25% safety margin that's 15.7 tons — a 20 ton press handles this comfortably, with headroom for multi-hole dies.

 

### Is tonnage the same for cutting and bending?

 No. Bending typically needs less force than cutting the same length and thickness of material — unless the die bottoms or coins the bend, which can multiply the required force 3–5 times.

 

### What happens if I use a press with too little tonnage?

 The press stalls near bottom dead centre, the clutch slips and overheats, and repeated overloading can crack the frame or damage the crankshaft — failures that are rarely economical to repair.

 

### Is this calculator accurate enough for final press selection?

 It gives a reliable working estimate using standard shear-strength formulas. For critical or high-volume jobs, [share your part drawing with our engineering team](https://wa.me/919780200007) for a verified tonnage and die-cushion recommendation, free of charge.

 **Want it confirmed by an engineer, not just a formula?** Send your part drawing and material spec to [WhatsApp +91-97802-00007](https://wa.me/919780200007) or [info@basantgroup.com](mailto:info@basantgroup.com) — we'll size the exact press and die-cushion setup for your job at no cost.