Enter any two values (engine displacement, torque, or the constant k) to calculate the missing one. Note: there is no universal “cc → torque” conversion—engine displacement alone does not determine torque. This calculator uses a simple linear estimate T ≈ k × displacement, where k must be chosen for the specific engine/conditions (engine type, tuning, and the RPM where torque is measured).
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Cc To Torque Formula
The following formula is a simplified estimate. It assumes torque scales roughly linearly with displacement for a given engine setup at its peak-torque operating point, using an engine-specific constant k (torque per unit displacement).
T \approx ES \times k
Variables:
- T is the torque (Nm)
- ES is the engine displacement (cc)
- k is an assumed constant (Nm/cc) chosen for the engine and operating point (not a universal conversion)
To estimate the torque, multiply the engine displacement by the assumed constant k. The value of k varies widely depending on engine type (gasoline/diesel), aspiration (naturally aspirated/turbocharged), tuning, and the RPM where torque is measured.
| Displacement (cc) | Torque (Nm) | Torque (ft-lb) |
|---|---|---|
| 49 | 4.9 | 3.615 |
| 50 | 5.0 | 3.688 |
| 100 | 10.0 | 7.376 |
| 125 | 12.5 | 9.220 |
| 150 | 15.0 | 11.063 |
| 200 | 20.0 | 14.751 |
| 250 | 25.0 | 18.439 |
| 300 | 30.0 | 22.127 |
| 350 | 35.0 | 25.815 |
| 400 | 40.0 | 29.502 |
| 450 | 45.0 | 33.190 |
| 500 | 50.0 | 36.878 |
| 600 | 60.0 | 44.254 |
| 650 | 65.0 | 47.942 |
| 700 | 70.0 | 51.629 |
| 750 | 75.0 | 55.317 |
| 800 | 80.0 | 59.005 |
| 900 | 90.0 | 66.381 |
| 1000 | 100.0 | 73.756 |
| 1200 | 120.0 | 88.507 |
| Example only (assumes a linear relation T = k × cc with k = 0.10 Nm per cc). Actual torque depends on engine design and RPM. Unit note: 1 Nm = 0.737562 ft-lb. | ||
What is Torque?
Torque is a measure of the rotational force that an engine can produce. It is a crucial factor in determining an engine’s ability to do work, such as moving a vehicle. Torque is typically measured in Newton-meters (Nm) or foot-pounds (ft-lb) and is a function of engine size, design, and other factors.
How to Calculate Torque from Cc?
The following steps outline how to estimate the torque from an engine’s displacement in cc (using an assumed constant k).
- First, determine the engine displacement (ES) in cubic centimeters (cc).
- Next, choose an appropriate constant (k) in Nm/cc for the engine and operating point. As a rough starting range, many naturally aspirated gasoline engines near peak torque are often around 0.08–0.12 Nm/cc; turbocharged and diesel engines can be higher (sometimes 0.12–0.20+ Nm/cc). The table on this page uses 0.10 Nm/cc as an example.
- Next, use the formula from above: T ≈ ES × k.
- Finally, calculate the estimated torque (T) in Newton-meters.
- After inserting the variables and calculating the result, you can check your answer with the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge.
Engine displacement (ES) = 1000 cc
Using an assumed constant (k) of 0.10 Nm/cc, the estimated torque (T) would be:
T ≈ 1000 cc × 0.10 Nm/cc = 100 Nm
