The Engine Torque Calculator is a useful tool for calculating the amount of torque an engine produces based on its power output and operating speed (RPM). Torque is the force that helps turn the crankshaft and drive the vehicle. This value is important for vehicle performance, tuning, and transmission design. The calculator falls under the Automotive Powertrain and Performance Calculator category.
This tool is especially valuable for mechanics, engineers, and automotive enthusiasts who need to understand how engine specifications translate to real driving power.
Formula of Engine Torque Calculator
Detailed Breakdown:
- T = Torque, measured in newton-meters (N·m)
- Power = Engine power, measured in kilowatts (kW)
- RPM = Engine speed, in revolutions per minute
- 9549 = Conversion constant that aligns kilowatts and RPM to newton-meters
This formula assumes metric units and calculates average torque output based on steady-state conditions.
Quick Reference Table
Use this reference to get estimated torque values for common power and RPM settings:
| Power (kW) | RPM | Torque (N·m) |
|---|---|---|
| 50 | 3000 | 159.15 |
| 100 | 4000 | 238.73 |
| 150 | 5000 | 286.47 |
| 200 | 6000 | 318.30 |
| 250 | 7000 | 341.04 |
These values provide a quick view of how torque changes with engine speed, assuming constant power output.
Example
Let’s calculate the torque of an engine producing 180 kW at 4500 RPM.
Step 1:
Use the formula:
Torque = (180 × 9549) / 4500
Step 2:
Torque = 1,718,820 / 4500 = 381.96 N·m
So, the engine delivers approximately 382 newton-meters of torque at 4500 RPM.
Most Common FAQs
Torque determines how much force the engine applies to the drivetrain. High torque improves acceleration, towing capacity, and low-end performance.
Torque is a measure of force. Horsepower (or kilowatts) is a measure of how quickly that force is applied. Power = Torque × RPM.
Yes. The same formula applies, as long as the power and RPM values are known. Electric motors often produce high torque at low RPMs.