Engine Torque Calculator
Calculate engine torque from horsepower and RPM. Convert between lb-ft, Newton-meters, and kilogram-meters instantly.
Engine Torque
300.0 lb-ft
Newton-meters
406.7 Nm
Kilogram-meters
41.48 kg-m
๐ก Torque = (HP ร 5,252) รท RPM = (300 ร 5,252) รท 5,252 = 300.0 lb-ft
๐ก How to Use the Engine Torque Calculator
How to Calculate Engine Torque
Torque is the rotational force that an engine produces โ it's what makes a vehicle accelerate, climb hills, and tow heavy loads. While horsepower measures how fast work is done, torque measures how much force is applied to the crankshaft at any given moment.
Worked Example: A 300 HP engine at 5,252 RPM produces exactly 300 lb-ft of torque. At 3,000 RPM, that same engine produces: (300 ร 5,252) รท 3,000 = 525 lb-ft.
Torque Unit Conversions
| From | To | Multiply by |
|---|---|---|
| lb-ft | Nm | 1.35582 |
| Nm | lb-ft | 0.73756 |
| lb-ft | kg-m | 0.13826 |
Why Torque Matters for Towing
Towing capacity is determined primarily by torque, not horsepower. A diesel truck making 500 lb-ft at 1,800 RPM can pull a heavy trailer from a standstill because the force is available at low RPM. A gasoline sports car making 350 lb-ft at 5,500 RPM has the raw number but can't apply it at the low speeds where towing occurs.