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Easily calculate punching force, blanking force, or press tonnage with our Punch Force Calculator. Simple tool for sheet metal work with step-by-step results.
Ever wondered how much force is needed to punch a hole in sheet metal? That’s where a Punch Force Calculator comes in handy. We built this tool so you can quickly find the punching force, tonnage, or blanking force for any material. It’s simple, fast, and accurate.
Whether you’re working with mild steel, aluminum, or stainless steel, the calculator helps you save time. No more guessing or complex math you’ll know the exact press tonnage you need before starting.
Punching force is the amount of pressure required to push a punch through material. In sheet metal work, this is key. If the force is too low, the punch won’t cut. If it’s too high, you’ll risk damage to the punch or die.
The formula to calculate punching force is very simple:
F = K × P × t × S
Where:
If you’re using tensile strength instead, shear strength can be taken as about 70% of tensile strength.
Using our calculator is as easy as making a cup of tea. Here’s how you’ll do it:
Step 1: Choose the hole shape
Pick round, square, rectangular, or custom.
Step 2: Enter the dimensions
Step 3: Add thickness and strength
Enter the sheet thickness and the shear or tensile strength of your material.
Step 4: Pick a safety factor
Usually between 1.1 and 1.3. This helps cover friction and tool wear.
Step 5: See results instantly
The calculator shows the punching force and also the total press tonnage, including stripping force.
In real-world fabrication, accuracy matters. Imagine trying to punch stainless steel without knowing the right force it’s like trying to hammer a nail with your bare hand. You’ll either fail or waste energy.
With this tool, you’ll know exactly how much force is needed. That means less trial and error, less tool damage, and better planning for press machines.
Let’s say you need to punch a round hole of 20 mm diameter in 2 mm thick stainless steel.
Now:
F = 1.2 × 62.8 × 2 × 400
F = 60,288 N
That’s about 60 kN of punching force.
Our Punch Force Calculator makes life easier for engineers, students, and fabricators. You’ll save time, avoid costly mistakes, and work smarter. Whether you call it punching force, blanking force, or press tonnage, this tool gives you the numbers you need in seconds.
F = K × P × t × S.
Divide the punching force in Newtons by 9,807 to get tons.
Yes, just enter the shear strength for stainless steel, usually 400–600 MPa.
A trained boxer’s punch can reach 700–1,000 lbf. But our calculator is for sheet metal, not boxing!
Yes, it’s fully online and works with any browser.