Engine CC to Horsepower Converter
Estimate the potential horsepower based on engine displacement and stroke type.
4-Stroke Engine (Standard)
2-Stroke Engine (High Power/Small)
High-Performance / Racing
Estimated Output
0.00 HP
Understanding CC to Horsepower Conversion
Converting cubic centimeters (CC) to horsepower (HP) is not a direct mathematical constant like converting miles to kilometers. CC measures displacement (the volume of the engine's cylinders), while Horsepower measures work over time (power output).
The General Conversion Formulas
Because engine efficiency varies, we use generalized ratios for small engines (like lawnmowers, scooters, and chainsaws):
- 4-Stroke Engines: On average, 15cc to 17cc produces 1 HP. Our calculator uses a base ratio of 15:1.
- 2-Stroke Engines: These complete a power cycle more frequently and are more efficient for their size. Usually, 10cc to 12cc produces 1 HP. Our calculator uses a 12:1 ratio.
- High Performance: Modern, fuel-injected, or racing engines can reach ratios of 1 HP per 1-5cc, but these require specific engineering data.
Real-World Examples
| Engine Displacement | Engine Type | Estimated HP |
|---|---|---|
| 50cc | 2-Stroke (Scooter) | ~4.17 HP |
| 160cc | 4-Stroke (Lawnmower) | ~10.67 HP |
| 600cc | 4-Stroke (Motorcycle) | ~40.00 HP (Base Utility) |
Factors That Influence Actual Horsepower
It is important to remember that two engines with the exact same CC can have wildly different horsepower ratings due to:
- RPM (Revolutions Per Minute): HP is a function of torque multiplied by RPM. An engine spinning faster generally produces more HP.
- Compression Ratio: Higher compression leads to more explosive force and higher power.
- Fuel Delivery: Fuel injection is typically more efficient than old-school carburetion.
- Cooling: Liquid-cooled engines can maintain higher power levels than air-cooled engines without overheating.
How to use this CC to HP Calculator
To get an estimate, simply enter the displacement in CC found on your engine's spec sheet or sticker. Select whether it is a 2-stroke or 4-stroke engine. If you are unsure, most modern outdoor power equipment (lawnmowers, snowblowers) and cars are 4-stroke, while small handheld tools (chainsaws, leaf blowers) are often 2-stroke.