Formula Used
Engine torque: T = P × 60 ÷ (2π × RPM)
Wheel torque: Tw = Te × G × F × C × η
Tractive force: Ft = Tw ÷ r
Power: P = T × 2π × RPM ÷ 60
Torque from force: τ = rF sin(θ)
Acceleration: a = (Ft − Fresistance) ÷ m
How to Use
- Select the calculation mode and drivetrain setup.
- Enter power, torque, RPM, ratios, and efficiency.
- Add wheel, mass, road, aerodynamic, and traction data.
- Enter optional gear ratios and torque curve points.
- Choose output units and decimal precision.
- Press calculate to view results, tables, and charts.
Example Data
| Vehicle | Power | RPM | Engine Torque | Gear Ratio | Final Drive | Wheel Radius | Mass |
|---|---|---|---|---|---|---|---|
| Family Car | 110 kW | 4,500 | 233 Nm | 3.55 | 4.10 | 0.31 m | 1,400 kg |
| Performance Car | 250 kW | 5,500 | 434 Nm | 2.90 | 3.73 | 0.34 m | 1,650 kg |
| Electric Vehicle | 180 kW | 8,000 | 215 Nm | 9.00 | 1.00 | 0.33 m | 1,900 kg |
Calculation History
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| Date | Mode | Engine Torque | Wheel Torque | Acceleration |
|---|---|---|---|---|
| No saved calculations yet. | ||||
Frequently Asked Questions
What is vehicle torque?
Vehicle torque describes rotational force within the drivetrain. Engine torque changes through gearing. Wheel torque produces force at the road.
How does gearing increase torque?
A larger gear ratio multiplies engine torque. It also reduces wheel speed. Lower gears therefore improve initial acceleration.
Why is wheel torque higher?
Transmission ratios multiply the engine output. Final-drive gearing adds further multiplication. Drivetrain losses reduce the theoretical result.
Does tyre size affect acceleration?
Yes, tyre radius changes tractive force. Smaller radii increase road force. Larger radii increase speed for equal RPM.
What efficiency value should I use?
Manual drivetrains often use higher efficiencies. Automatics may have greater losses. Real values depend on operating conditions.
What limits usable wheel torque?
Tyre grip limits usable tractive force. Weight distribution changes available grip. Surface conditions also strongly affect traction.
Can this calculator model electric vehicles?
Yes, select the electric vehicle preset. Enter motor torque and speed. Use the fixed reduction ratio.
How is climbing ability estimated?
Available tractive force must overcome resistance. Rolling and aerodynamic losses are deducted. Remaining force supports climbing effort.
Are the acceleration results exact?
No, they are engineering estimates. Gear shifts and weight transfer vary. Real testing provides the best confirmation.
Important Disclaimer
Results are theoretical estimates for planning and comparison. Real vehicles experience changing grip, losses, temperatures, and control limits. Verify critical decisions using manufacturer data and professional testing.