Engineering Calculators

🧮 Engineering Calculators

Practical calculators for Mechanical, Electrical, Hydraulics, Pneumatics and Automotive engineering.

⚡ Ohm's Law

Calculate Voltage, Current or Resistance.

⚡ Electrical Power

Calculate Power, Voltage or Current.

⚡ Motor Current

Estimate three-phase motor current.

🔧 Torque

Calculate torque from force and lever arm.

⚙️ Gear Ratio

Calculate gear ratio and output speed.

🔄 RPM

Calculate RPM from cutting speed and diameter.

🔗 Belt Length

Estimate open-belt length.

💧 Hydraulic Force

Calculate cylinder force from pressure and bore.

💧 Hydraulic Pressure

Calculate pressure from force and area.

💧 Hydraulic Flow

Calculate flow from cylinder dimensions and speed.

💨 Pneumatic Force

Calculate pneumatic cylinder force.

🚗 Mileage

Calculate vehicle fuel efficiency.

🚗 Engine Displacement

Calculate engine displacement from bore, stroke and cylinders.

🚗 Power-to-Weight

Calculate vehicle power-to-weight ratio.

📏 Unit Converter

Length, pressure, temperature and weight conversions.

Ohm's Law

Enter exactly two values. Formula: V = I × R.

Electrical Power

DC/single-phase apparent-power form: P = V × I. AC real power may require power factor and phase information.

3-Phase Motor Current

Estimated full-load current: I = P / (√3 × V × η × PF).

Torque

T = F × r, for perpendicular force.

Gear Ratio

Ratio = driven teeth / driver teeth. Ideal output RPM = input RPM / ratio.

Machining RPM

RPM = (1000 × cutting speed) / (π × diameter).

Open Belt Length

Approximate open-belt formula: L = 2C + π(D+d)/2 + (D-d)²/(4C).

Hydraulic Cylinder Force

Theoretical extension force: F = P × A. Actual force is lower due to losses.

Hydraulic Pressure

Pressure = Force / Area.

Hydraulic Cylinder Flow

Extension-side flow, ideal: Q = area × speed. Result is converted to L/min.

Pneumatic Cylinder Force

Theoretical extension force; actual pneumatic force depends on pressure losses and efficiency.

Vehicle Mileage

Mileage = distance / fuel consumed.

Engine Displacement

Displacement = π/4 × bore² × stroke × number of cylinders.

Power-to-Weight Ratio

Result shown as kW/tonne.

Unit Converter

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