Estimate torque using power, RPM, force, leverage, and gearing. Review engine and wheel output instantly. Export clean results for reports and workshop planning tasks.
Engine torque from power: Torque (N·m) = 9550 × Power (kW) ÷ RPM
Wheel torque from engine torque: Wheel Torque = Engine Torque × Gear Ratio × Final Drive Ratio × Efficiency
Torque from tire force: Wheel Torque = Road Force × Tire Radius
Tractive force: Tractive Force = Wheel Torque ÷ Tire Radius
Ideal acceleration: Acceleration = Tractive Force ÷ Vehicle Mass
1. Choose the calculation method that matches your available data.
2. Enter power and RPM, road force and tire radius, or direct engine torque.
3. Add gear ratio, final drive ratio, and drivetrain efficiency.
4. Enter tire radius to estimate tractive force at the contact patch.
5. Add vehicle mass to estimate ideal acceleration.
6. Press the calculate button to show results above the form.
7. Use the export buttons to save the result table as CSV or PDF.
| Vehicle | Power | RPM | Gear Ratio | Final Drive | Tire Radius | Engine Torque | Wheel Torque |
|---|---|---|---|---|---|---|---|
| Compact Sedan | 110 kW | 4200 | 1.90 | 4.10 | 0.30 m | 250.119 N·m | 1,753.333 N·m |
| Sports Coupe | 150 kW | 4000 | 1.80 | 3.90 | 0.32 m | 358.125 N·m | 2,262.829 N·m |
| Utility Pickup | 180 kW | 3200 | 2.20 | 3.70 | 0.36 m | 537.188 N·m | 3,934.962 N·m |
Vehicle torque is the twisting force produced by the engine or motor. It drives the wheels through the transmission and axle. Strong torque improves launch feel, grade climbing, towing response, and low speed pull. This calculator helps you estimate that force from several engineering inputs.
Engine torque is only the starting point. The gearbox and final drive multiply torque before it reaches the tire. That is why a smaller engine can still create strong wheel force in a lower gear. Wheel torque is often more useful than crankshaft torque when comparing real driving performance.
Torque and power are linked by engine speed. At a fixed power level, torque falls as RPM rises. At a lower RPM, the same power creates more torque. This is important when checking pulling ability, shift points, and drivetrain matching for daily use or track work.
Torque at the wheel can also be found from force at the tire contact patch. Multiply road force by tire radius. This gives a simple way to estimate the torque needed for traction, climbing, or rolling resistance studies. Tire radius changes the result, so use a realistic loaded rolling radius.
Gear ratio and final drive ratio create torque multiplication. Drivetrain efficiency reduces the final number because some power is lost in gears, bearings, joints, and shafts. A realistic efficiency input makes this calculator more useful for workshop planning, drivetrain design, and performance checks.
This vehicle torque calculator supports engine tuning, EV analysis, axle selection, and educational projects. It can also help when comparing transmission choices, estimating tractive effort, or checking whether a setup can meet a required road load. Use the result table and exports for reports, service notes, or quick engineering reviews.
It estimates engine torque, axle torque, wheel torque, tractive force, and ideal acceleration. It also converts between common power, force, torque, radius, and mass units.
Wheel torque is multiplied by the transmission gear and final drive. Drivetrain losses reduce it slightly, but lower gears still produce much higher wheel torque than engine torque.
Yes. The calculator uses Torque = 9550 × Power(kW) ÷ RPM. This is a common engineering relationship for rotational systems.
Use the loaded rolling radius, not only the unloaded sidewall size. A realistic radius gives a better tractive force estimate.
Yes. Gears, shafts, bearings, and joints create losses. Efficiency keeps the wheel torque result closer to real vehicle behavior.
Yes. It works well for electric vehicles because motors also produce rotational torque. Enter motor power, direct torque, or road force values.
No. It is an ideal estimate. Real acceleration also depends on drag, rolling resistance, traction limits, slope, and shifting behavior.
Use it when you know the force needed at the tire, such as climb load, towing resistance, or required tractive effort for a target condition.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.