CC to HP calculator: an honest horsepower estimate
There is no exact way to convert cc to hp. Cubic centimetres (cc) measure an engine’s size — the volume its pistons sweep — while horsepower measures how much work it does each second. Two 1,000 cc engines can differ by a factor of five: a generator engine makes about 30 hp per litre and a superbike engine about 200. This cc to hp calculator therefore gives an estimate: displacement multiplied by the typical horsepower per litre for the type of engine you choose, with the likely range either side.
Use it to get a feel for a bike, scooter, car or engine whose power you do not know, to compare engine types, or to run it backwards — HP → CC — to see what engine size usually gives a certain power. It also shows PS and kW, a comparison across ten engine types and a cc to hp conversion chart.
How to estimate horsepower from cc
- Choose CC → HP or HP → CC.
- Enter the engine displacement in cc, litres or cubic inches — or the power in hp, PS or kW.
- Pick the Engine type that matches (or choose Custom and type your own hp per litre).
- Read the typical figure, the likely range and the comparison table.
- Optionally open Engineering check and enter the rpm and mean effective pressure for a physics-based cross-check.
Engine CC to HP Estimator features
Range, not a fake exact number
Every result shows a low, typical and high figure from the spread of real engines of that type.
Ten engine types
From commuter scooters and generators to turbo diesels, superbikes and performance cars, plus a custom rate.
Both directions
Convert cc to hp or hp to cc, with cc, litres, cubic inches, hp, PS and kW.
Conversion chart
Typical horsepower for 50 cc to 5,000 cc for the engine type you pick.
Engineering formula
Power from mean effective pressure, displacement and rpm, for readers who know those values.
How the cc to hp estimate works
Power ≈ displacement in litres × specific output in hp per litre. A 1,200 cc naturally aspirated petrol car engine at a typical 75 hp per litre gives 1.2 × 75 ≈ 90 hp, with a likely range of 66–114 hp. A 150 cc commuter motorcycle at about 70 hp per litre gives about 10.5 hp. For reference, the average non-hybrid petrol engine sold in the US in 2015 made 93.3 hp per litre (The Truth About Cars, July 2015).
The bands below are this tool’s estimates, chosen to cover published outputs of common engines of each type. They are not a standard — always prefer the maker’s figure.
| Engine type | hp per litre (low–typical–high) |
|---|---|
| Scooter / commuter motorcycle, air-cooled | 55–70–85 |
| Motorcycle, liquid-cooled single or twin | 75–100–130 |
| Sport motorcycle, four-cylinder | 150–190–230 |
| Two-stroke motorcycle | 70–100–150 |
| Car, naturally aspirated petrol | 55–75–95 |
| Car, turbocharged petrol | 85–110–140 |
| Performance car | 120–150–200 |
| Car / SUV turbo diesel | 45–65–85 |
| Truck / bus diesel | 25–35–50 |
| Small utility engine | 20–30–40 |
Why engines of the same size make different power
Engineers express this with brake mean effective pressure (BMEP): power = BMEP × displacement × rpm ÷ (60 × 2) for a four-stroke (÷ 60 for a two-stroke). At 10 bar, 1.2 litres and 6,000 rpm that is 60 kW, or about 80 hp.
- Rpm: power is torque × speed. A sport bike revving to 14,000 rpm makes far more power per litre than a truck engine that stops near 2,500 rpm.
- Air supply: a turbocharger forces more air in, so a 1.0-litre turbo engine can match a 1.5-litre naturally aspirated one.
- Strokes: a two-stroke fires every revolution instead of every other one, so it makes more power for its size.
- Tuning and rules: emissions and durability targets, fuel quality and cooling all limit output.
hp, bhp, PS and kW
Mechanical horsepower (hp, often written bhp for power measured at the crankshaft) is 745.7 W. Metric horsepower (PS), common on Indian and European spec sheets, is 735.5 W — about 1.4% smaller — so 100 PS is 98.6 hp or 73.5 kW. For exact unit changes use the power converter or hp to kW; for turning force, the torque calculator.
Engine CC to HP Estimator FAQ
How do you convert cc to hp?
You cannot convert it exactly; you can only estimate. Multiply the litres (cc ÷ 1,000) by a typical hp per litre for that engine type — about 70 for a commuter bike, 75 for a petrol car, 110 for a turbo petrol and 65 for a turbo diesel.
How many hp is 150cc?
About 8–13 hp for an air-cooled commuter motorcycle or scooter, and roughly 11–20 hp for a liquid-cooled sporty 150. Check the maker’s spec for the exact figure.
How many hp is 1000cc?
Roughly 30 hp for a generator engine, 75 hp for a small naturally aspirated car engine, 110 hp for a turbocharged one, and 190 hp or more for a sport motorcycle.
Is there a cc to hp conversion chart?
Yes — the chart above lists typical horsepower and the likely range from 50 cc to 5,000 cc for the engine type you choose.
What is the difference between hp and bhp?
Brake horsepower (bhp) is power measured at the crankshaft, before losses in the gearbox and drivetrain. In practice most spec sheets use hp and bhp for the same 745.7 W unit.
Can I use this for an official figure?
No. It is an estimate for comparison only; registration documents and the manufacturer state the real power.