How accurate is the calculation of power by volume?

The error is 5-10%. The calculator shows the theoretical power of a working engine without taking into account wear, fuel quality and the condition of attachments.

How does compression ratio affect power?

The compression ratio directly affects efficiency. Increasing this parameter by 1 unit gives an increase in power of approximately 3-4%.

Is it possible to calculate the power of a turbocharged engine?

Yes, the presence of a turbine (supercharging) significantly increases the cylinder filling ratio, which is taken into account in the formula when choosing the appropriate engine type.

Calculation of engine power

Estimation of horsepower and kilowatts by volume

Engine capacity (cm³)

Motor type

Cylinders

Compression (CR)

Enter engine size (from 50 cm³)
to see estimated power

Rated power:

0 hp

0 kW

🚗 Ordinary city car

Working volume-

Configuration-

Cylinders-

Compression ratio-

Engine power calculation

🚗 Calculation of theoretical engine power

This calculator allows you to find out the potential of the engine (in horsepower and kilowatts), based on its physical parameters: volume, number of cylinders and compression ratio. This is useful if the factory data is unknown or the engine has undergone modifications (tuning).

💡 How it works: We use thermodynamic formulas to calculate the indicator power. You enter the parameters of the hardware - we tell you how much power it can produce under ideal conditions.

Use scenarios: when is it needed?

Tuning and boring: If you increased the cylinder diameter, first calculate the new displacement using engine displacement calculator, and then come back here to find out the power increase.
Purchasing a contract motor:Checking the characteristics declared by the seller if there are no nameplates on the engine.
Comparison with reality: This method gives calculated (mathematical) power. To find out the real performance of the engine on the road (taking into account the wear and weight of the car), it is better to use acceleration power calculation.

Don't forget: the higher the power, the more gasoline the engine consumes. You can evaluate the car’s appetite in the fuel consumption section.

Больше по теме: Acceleration 0-100 km/h

Engine🏎️ Find out the real power, not the nameplate Factory specifications often do not coincide with reality - engines wear out, and tuning changes parameters.

Engine power🏎️ Calculation of real engine power This calculator solves an engineering problem: it converts torque (Nm) and revolutions (RPM) into horsepower or kilowatts that everyone can understand.

kW ⇄ hp🚗 Engine power converter: hp. in kW Converting horsepower to kilowatts is a common task for car owners.

Frequently asked questions (FAQ)

❓ How accurate is this calculation?

The error is 5-10%. The calculator shows the theoretical maximum of a serviceable engine. It cannot take into account factors such as a clogged air filter, spark quality, piston ring wear, or gasoline quality. For 100% accuracy you need a dynamometer.

❓ Why is compression ratio important?

This is a key performance parameter. The more the mixture is compressed before the explosion, the more energy it will release. Increasing the compression ratio by just 1 unit can give a power increase of about 3-4%.

❓ How does the turbine affect?

Turbocharging forces more air into the cylinders than a naturally aspirated engine can suck in. This increases power multiple times (by 30-50% or more) with the same engine size.

❓ What is the difference between hp. and kW?

These are just different units of measurement. 1 kilowatt (kW) ≈ 1.36 horsepower (hp). The PTS usually indicates both values, but the tax is calculated by hp.