Inputs
Results
Push force = PSI × bore area. Speed = GPM × 231 ÷ area (in²).
What this calculator actually solves
Hydraulic cylinder sizing has two distinct questions: how much force do I get, and how fast does it move? Most online calculators only answer the force part. This one also gives you extension and retract speed, which is determined by the cylinder's two effective areas (full bore area for extending, bore minus rod area for retracting). Retract is faster but weaker — and this is where most hydraulic sizing mistakes happen.
Who this is for
Shop and fab techs sizing a press cylinder for a specific clamp force.
Mobile equipment and farm-equipment owners trying to diagnose slow cylinder motion.
How to read the results
Pull force is always less than push force because the rod takes up area on the retract side. If your work requires the same force pushing and pulling (e.g. a log splitter with a swing gate), size for the smaller number.
Retract speed is faster than extend because the rod side has less area. If you need symmetric speed — use a double-rod cylinder or add a regenerating circuit.
Limitations
This is a steady-state calculation. Cylinder force drops as the load pressure drops and as system leaks; the numbers are peak values at the rated pressure.
Mechanical efficiency includes seal friction and load friction. Real efficiency is load-dependent — under no load, friction is higher relative to output.
Frequently Asked Questions
Why does retract force differ from extend?
Because the rod takes up area on the retract side. On extending, the full bore area is pressurized; on retracting, only the annular area between bore and rod is pressurized.
What's a typical mechanical efficiency?
For new, well-sealed cylinders, 0.85–0.92. As seals wear, efficiency drops; old cylinders with significant bypass leak can drop below 0.50.
Can I get more force by raising pressure?
Yes, linearly — until you exceed the cylinder's rated pressure, at which point the seals fail or the rod buckles. Standard cylinders are rated for 2500–3000 PSI; high-pressure cylinders go to 5000+.
About this tool
What this tool is for: Hydraulic Cylinder Force Calculator is a workbench reference for working mechanics, machinists, restoration shops, and serious hobbyists. It is built because the usual online calculators skip the friction loss, the sign convention, the unit conversion, or the engineering code that actually matters on the job.
Purpose and scope
Push, pull, and speed for a hydraulic cylinder from bore, rod, GPM, and PSI. It is a steady-state calculation; accumulator and valve dynamics are out of scope.
How to use the body of this page
The sections above this footer — “What this calculator solves,” “Who this is for,” “How to read the results,” and “Limitations” — describe in detail what the formula does, why a tech would use it, how to interpret the number, and where the model is wrong. The FAQ block answers the three or four questions most asked about this specific tool. Together they make up the “About” content for this page; you do not need to look elsewhere.
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All calculators on MechCalc Pro run the math in your browser and assume standard conditions (sea-level pressure, ambient temperature, dry friction, textbook geometry). They do not capture manufacturing tolerances, the wear state of your specific parts, environmental extremes, regulatory codes (ASME, DOT, AWS D1.1, etc.), or the load spectrum of your job. They are not a substitute for a stamped engineering review on safety-critical work.
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All content on this page, including formulas and calculator outputs, is provided for general informational and educational purposes only. It is not professional engineering advice, it is not a substitute for manufacturer specifications, and it is not a warranty of fitness for any particular purpose.
Mechanical, hydraulic, and welding work can cause serious injury, death, or property damage if performed incorrectly. Numbers produced by this calculator reflect simplified textbook models; they do not capture manufacturing tolerances, material defects, environmental conditions, wear, fatigue, regulatory codes (such as ASME, DOT, or AWS), or the specific service conditions of your job. Always cross-check critical values against the original equipment manufacturer's published specifications and a qualified engineer's review before committing to the job.
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