HP ↔ KW Principles

Horsepower (HP) and Kilowatts (KW) are both measures of power. The conversion is based on standard factors:

• 1 Imperial HP = 0.7457 KW
• 1 Metric HP (PS) = 0.7355 KW
• 1 KW = 1.34102 HP (Imperial)
• 1 KW = 1.35962 PS (Metric HP)

HP is commonly used in the UK and US, while KW is the standard power unit in the metric system.

NM ↔ Ft-LB Principles

Newton-Meters (NM) and Foot-Pounds (Ft-LB) are both units of torque, measuring rotational force:

• 1 NM = 0.73756 Ft-LB
• 1 Ft-LB = 1.35582 NM

NM is the metric unit for torque, commonly used in Europe, while Ft-LB is more common in the US and UK.

Torque & RPM to HP Principles

Power (HP) is derived from torque and rotational speed (RPM) using the formula:

• HP (Imperial) = (Torque in Ft-LB × RPM) / 5252
• PS (Metric HP) = HP × 1.01387
• KW = HP × 0.7457

This calculation shows how engine torque at a given RPM translates into power output.

Llandow Tuning Technical Resources

These calculators are provided free of charge and without warranty. While we strive for accuracy, we recommend verifying critical calculations. If you have any technical or mathematical questions regarding their use, feel free to reach out to us.