Calculate splitting tons, return force, and cycle time. Switch units easily for detailed shop estimates. Get practical results before buying pumps, cylinders, or valves.
| Setup | Bore | Rod | Stroke | Pressure | Flow | Efficiency | Approx. Tonnage |
|---|---|---|---|---|---|---|---|
| Compact Unit | 3.5 in | 1.75 in | 20 in | 2500 psi | 8 GPM | 80% | 9.62 tons |
| Workshop Unit | 4 in | 2 in | 24 in | 3000 psi | 11 GPM | 85% | 16.02 tons |
| Heavy Unit | 5 in | 2.5 in | 24 in | 3500 psi | 16 GPM | 88% | 30.24 tons |
Piston Area = π × Bore² ÷ 4
Rod Area = π × Rod² ÷ 4
Retract Area = Piston Area − Rod Area
Splitting Force = Pressure × Piston Area × Efficiency
Retract Force = Pressure × Retract Area × Efficiency
Tonnage = Force ÷ 2000
Oil Volume = Area × Stroke ÷ 231
Time = Volume ÷ Flow × 60
Hydraulic Horsepower = Pressure × Flow ÷ 1714
Estimated Motor Horsepower = Hydraulic Horsepower ÷ Efficiency
The calculator first converts all user inputs into common working units. It then computes push force, retract force, cylinder oil volume, travel time, cycle time, and a practical motor estimate.
A log splitter works by pushing hydraulic oil into a cylinder. The cylinder moves a wedge or ram. Splitting force depends on pressure and piston area. Bigger bore cylinders create more force. Higher pressure also raises force. This calculator combines both values quickly.
Bore diameter is the strongest driver of tonnage. A small increase in bore changes area fast. That happens because area grows with the square. Rod diameter matters too. It reduces retract area. That changes return force and return speed. Stroke length does not change tonnage. It changes oil volume and travel time.
Flow rate affects speed. More gallons per minute reduce extension time. They also reduce retraction time. Pressure affects horsepower demand. That is important for motor selection. Many users only check tonnage. They forget the electrical load. A splitter can reach the target force. Still, it may need a larger motor.
Efficiency is also important. Real systems lose energy through hoses, valves, heat, and seals. A practical estimate should include those losses. That is why this tool asks for efficiency. Lower efficiency reduces true splitting force. It also increases the motor size estimate. The result becomes more realistic.
Reverse sizing is useful before you buy parts. You can enter a target tonnage. The calculator then estimates required pressure. It also shows the bore needed for that target. This helps when comparing pumps and cylinders. It also helps when matching a power unit.
Use the final numbers as planning values. Always verify cylinder ratings, hose ratings, valve limits, and relief settings. Check duty cycle and motor startup conditions. Hard wood, knot density, wedge geometry, and temperature can change real performance. Even so, a strong hydraulic estimate gives a better starting point. It helps avoid undersized equipment and slow cycle times.
It is the pushing force available at the ram. Most shops express it in US tons. Higher tonnage usually handles tougher logs and knotty wood more easily.
No. Stroke changes travel distance and oil volume. Tonnage mainly depends on bore size, system pressure, and real hydraulic efficiency.
Rod diameter reduces retract area. That changes return force and return speed. It does not reduce forward push area on the extend side.
Real hydraulic systems lose energy. Efficiency accounts for hose losses, valve losses, seal drag, and heat. It gives more realistic force and motor estimates.
The tool uses pressure and flow to find hydraulic horsepower. It then adjusts the value by efficiency. This gives a more practical motor requirement.
Use the pressure the splitter normally reaches during hard splitting. Relief pressure is useful for maximum design checks. Daily operation may be lower.
Yes. The calculator accepts millimeters, centimeters, bar, MPa, and liters per minute. It converts them automatically before solving.
No. Wood species, moisture, knot pattern, wedge design, and oil temperature change real performance. Use the results as sound engineering estimates.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.