HP vs CC Conversion Chart
By: Leon Rhodes
Converting between engine horsepower(HP) and cubic centimeters(CC) is not an exact science, however, the generally accepted base conversion formula is 1HP = 15cc.
Engine performance and overall engine condition can dramatically affect the actual final conversion value.
Performance Plays a Role
It's important to understand that an engine's performance characteristics can greatly change the actual horsepower per cc ratio of that engine.
Example: A finely tuned supercar might be able to generate 1 HP for every 5-6 cc's of engine displacement while a poorly maintained small engine may only generate 1 HP per 30-45 cc.
Engine CC / HP Conversion Chart (1 HP = 15 cc)
- 15cc = 1 HP
- 50cc = 3.33 HP
- 100cc = 6.66 HP
- 150cc = 10 HP
- 200cc = 13.33 HP
- 250cc = 16.66 HP
- 300cc = 20 HP
- 350cc = 23.33 HP
- 400cc = 26.66 HP
- 450cc = 30 HP
- 500cc = 33.33 HP
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- 550cc = 36.66 HP
- 600cc = 40 HP
- 650cc = 43.33 HP
- 700cc = 46.66 HP
- 750cc = 50 HP
- 800cc = 53.33 HP
- 850cc = 56.66 HP
- 900cc = 60 HP
- 950cc = 63.33 HP
- 1000cc = 66.66 HP
- 1500cc = 100 HP
- 2000cc = 133.33 HP
Base HP per CC varies by vehicle type
Different types of vehicles have different performance requirements and their engines are designed accordingly. As such, modify the base HP per cc value you use in your conversions to match the expected vehicle performance type. This list should help.
- ATVs = 13-18 cc / HP
- Cars = 7-15 cc / HP
- Jet skis = 5-10 cc / HP
- Lawnmowers = 25-40 cc / HP
- Motorcycles = 5-15 cc / HP
- Outboard engines = 15-25 cc / HP
- Snowmobiles = 5-22 cc / HP
HP/CC Conversion Factors to Consider
- Is the engine turbo charged?
- Does the engine have performance parts?
- Has the engine been properly maintained?
- Was the engine designed for performance use?
- How old is the engine?
- How many hours has the engine been used?
- What type of fuel does the engine run on?
- How many RPM is the engine capable of?
- At what altitude is the engine being used?
- Is the engine properly tuned?
The answer to all of these questions can modify the actual final conversion value. Consider them when converting HP vs CC.
HP/CC Conversion F.A.Q.
What does engine cc mean?
cc stands for cubic centimeters. Engine cc refers to the overall size of an engine's combustion chamber. The size of an engine's combustion chamber determines the engine's displacement value. Thus, engine cc = engine displacement.
How many cc's are in 1 horsepower?
One horsepower is equal to roughly 15 cc of displacement in a well maintained small engine. Power output increases, such as from using performance parts, without a matching increase in engine displacement size will change the exact value.
How many hp is a 99cc engine?
The power output of a 99cc engine is roughly 6.6 HP. One HP per 15 CC is typical in most small engines.
How much horsepower is 200cc?
A well maintained 200cc small engine can expect to produce 13.33 HP at peak RPM in stock condition.
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