Engineering tools
Press tonnage calculator
A hydraulic press turns oil pressure into force on the piston: force is pressure times piston area. Enter a bore and a pressure to see the force, or switch modes to find the bore a required force needs, rounded up to a standard ISO bore.
Calculator
Results
Press force
76.1 t
746 kN · piston area 314 cm² per cylinder
- Pressure class
- Standard (up to 315 bar)
Press force: 76.1 t
An estimate, not an engineering certification. Our engineers check every figure before a machine is quoted.
Worked example
A press with one Ø200 mm cylinder at 250 bar: the piston area is π × 200² ÷ 4 = 31,416 mm². At 250 bar (25 N/mm²) that makes 785 kN, about 80 t. With 95% efficiency the press delivers about 76 t.
Assumptions
- Force at the piston only; losses in the frame and tooling aren't included.
- Efficiency covers seal friction and pressure losses (95% by default).
- To find a bore, the safety factor is added first, then the result is rounded up to the next standard bore (ISO 3320).
The formulas
Where
- A
- piston area
- D
- cylinder bore
- F
- force
- P
- working pressure
- n
- number of cylinders
- η
- efficiency
- SF
- safety factor
Related products
Questions
How many tonnes does a 200 mm cylinder make at 250 bar?
About 80 t of theoretical force (785 kN), or about 76 t with 95% efficiency.
Why add a safety factor?
Real loads peak above the nominal force, pressure drops through valves and hoses, and seals wear. A factor of 1.25 keeps the press working below its maximum pressure.
Is a bigger bore or a higher pressure better?
A higher pressure allows a smaller cylinder and less oil flow, but needs stronger tubes, seals and valves. Many industrial presses work between 160 and 315 bar; an engineer weighs both for your machine.
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Tell us what you need to press.
An engineer will study your request and get back to you with a proposal.