Mechanical & Hydraulic calculators
Force, speed, and load calculators for hydraulics, rigging, and mechanical systems.
- Belt Length CalculatorThe open belt length is about 2 × center distance + π ÷ 2 × (D + d) + (D − d)² ÷ (4 × center distance).Inputs: Large pulley diameter, Small pulley diameter, Center distance
- Bolt Stress Area, Proof Load, and Torque CalculatorTensile stress area is 0.7854 × (D − 0.9743 ÷ TPI)², proof load is that area times proof strength, and torque ≈ K × diameter × preload.Inputs: Bolt grade, Nominal diameter, Threads per inch
- Horsepower and Torque CalculatorHorsepower equals torque in pound-feet times RPM divided by 5,252, so torque and horsepower are equal at 5,252 RPM.Inputs: Find, Speed, Torque
- Hydraulic Cylinder Force and Speed CalculatorCylinder push force = pressure × piston area (π ÷ 4 × bore²); speed = flow × 231 ÷ (60 × area) in inches per second.Inputs: Bore diameter, Rod diameter, Pressure
- Hydraulic Pump Flow and Horsepower CalculatorPump flow in gpm equals RPM × displacement (in³ per rev) ÷ 231, and hydraulic horsepower equals gpm × psi ÷ 1,714.Inputs: Pump speed, Displacement per revolution, Working pressure
- Pulley and Sprocket RPM CalculatorDriven RPM = driver RPM × driver size ÷ driven size, using pulley diameters or sprocket tooth counts.Inputs: Find, Driver speed, Driver size
- Pulley Mechanical Advantage CalculatorIdeal mechanical advantage equals the number of rope parts supporting the load; the pull needed is load ÷ advantage, plus friction losses.Inputs: Load weight, Rope parts supporting the load, Friction loss per sheave
- Sling Angle Load CalculatorSling tension per leg = load ÷ (number of legs × sin of the angle from horizontal); a 30° angle doubles the tension in each leg of a two-leg sling.Inputs: Load weight, Number of legs carrying the load, Sling angle from horizontal
- Thermal Expansion CalculatorLength change equals the expansion coefficient × original length × temperature change; 100 feet of steel grows about 0.7 inch for a 100°F rise.Inputs: Material, Own coefficient, Original length