kW to CC

Estimate the engine displacement needed to produce a given power, using specific output in kW per litre.

Sizing the electrical supply for the same machine? Use the kVA to kW calculator.

kW to CC Calculator

cc = (kW ÷ kW per litre) × 1,000
100 kW
kW
60 kW/L
kW/L

Power produced per litre of displacement

Quick values

At a glance

cc = (kW ÷ kW per litre) × 1,000
Displacement
1,667 cc
Engine power
100 kW
Specific output
60 kW/L

Every diagram and table on this page updates with the calculator above.

Output

Live
Displacement
1,667cc
cc = (100 kW ÷ 60 kW/L) × 1,000 = 1,667 cc
In litres1.67 L
Power134.1 hp

There Is No Direct kW to cc Conversion

Power and displacement are different physical quantities. This page gives a defensible estimate, not a conversion.

Kilowatts measure the rate of doing work. Cubic centimetres measure the volume the pistons sweep. Nothing in physics ties them together — the link is how hard the engine is tuned, which is exactly what specific output describes.

cc = (kW ÷ kW per litre) × 1,000

An engineering estimate that depends entirely on the assumed specific output.

Treat the result as a range

A 100 kW engine could plausibly be 1.1 L or 2.9 L depending on induction, tuning and fuel. Use the estimate to sanity-check, never to specify.

Note: This is an engineering estimate, not an exact conversion.

The estimate

Live
Input100kW
Result1,666.7cc
Estimated displacement

Specific Output by Engine Type

Engine typekW per litre100 kW needs
Small utility / generator engine20 – 254.0 – 5.0 L
Road diesel, naturally aspirated25 – 352.9 – 4.0 L
Turbo-diesel35 – 551.8 – 2.9 L
Petrol, naturally aspirated50 – 701.4 – 2.0 L
Modern turbo petrol80 – 1100.9 – 1.25 L
High-performance / motorsport120 – 200+0.5 – 0.8 L

The spread across that table is more than eight to one. That is the whole reason a single conversion factor cannot exist.

Specific output bands

Live
Utility
Diesel
NA petrol
Turbo / sports
60 kW/L
Your assumed specific output against typical engine families

What the Cubic Centimetres Represent

Displacement is the total volume swept by every piston in one full cycle: bore area × stroke × cylinder count. It sets how much air the engine can draw in per revolution, and air is what limits how much fuel can be burned.

cc = π ÷ 4 × bore² × stroke × cylinders

Bore and stroke in centimetres gives the answer directly in cubic centimetres.

A four-cylinder 2.0 litre

Given
  • Bore: 8.25 cm
  • Stroke: 9.35 cm
  • Cylinders: 4
Working
  1. Area = π ÷ 4 × 8.25² = 53.46 cm²
  2. Per cylinder = 53.46 × 9.35 = 499.9 cm³
  3. Total = 499.9 × 4

About 1,999 cc — the familiar 2.0 litre badge.

Swept volume

Live
Estimated displacement1,667 ccfor 100 kW
Swept volume for your power target

Power to Displacement Chart

Estimated displacement across a range of power outputs at your selected specific output.

Displacement chart

Live
kWDisplacement (cc)Power (hp)
5 kW836.71
10 kW16713.41
20 kW33326.82
30 kW50040.23
50 kW83367.05
75 kW1,250100.58
100 kW1,667134.1
125 kW2,083167.63
150 kW2,500201.15
200 kW3,333268.2
250 kW4,167335.26
300 kW5,000402.31
400 kW6,667536.41

Why Turbo Engines Make More Per cc

A naturally aspirated engine can only draw in as much air as atmospheric pressure will push into the cylinder. Forced induction raises the inlet pressure, so the same swept volume holds substantially more air — and therefore burns more fuel per cycle.

Turbocharger

Driven by exhaust energy. Efficient, but with some lag before the turbine spools up.

Supercharger

Driven mechanically from the crank. Instant response, at the cost of parasitic drag.

Intercooling

Cools the compressed charge so it is denser still, adding output and reducing knock.

This is why engine downsizing works: a 1.4 L turbo can replace a 2.0 L naturally aspirated engine at similar output while consuming less fuel at light load.

Three engine families

Live
Diesel 35 kW/L
Displacement
2,857 cc
Litres
2.86 L
NA petrol 60
Displacement
1,667 cc
Litres
1.67 L
Turbo 95
Displacement
1,053 cc
Litres
1.05 L
The same power target across three engine families

What This Estimate Can and Cannot Tell You

Reasonable uses
  • Sanity-checking a claimed output against a stated displacement.
  • Narrowing a search when replacing an engine of unknown specification.
  • Comparing how hard two engines are tuned relative to each other.
  • Rough sizing during early concept work, before real data exists.
  • It cannot tell you the actual displacement of a specific engine — read the plate.
  • It cannot account for two-stroke cycles, rotary engines or unusual valve timing.
  • It cannot predict torque, which depends on tuning far more than on displacement.

Displacement against power

Live
8,333.300500Power (kW)
100 kW1,666.7 cc
Estimated displacement across the power range at your specific output

Every Power Converter in One Place

29 calculators built on the same maths as the tool above. Each one has its own inputs, interactive diagrams and worked examples.

View all converters

kW to CC Questions

Common questions about converting kw to cc.

No. Power and displacement are different quantities. You can only estimate cc if you assume a specific output in kW per litre.

About 1,667 cc at 60 kW/L, or roughly 1,100 cc at a turbocharged 90 kW/L.

Power produced per litre of displacement. It measures how hard an engine works for its size.

Forced induction pushes more air into the same cylinder volume, allowing more fuel to be burned per cycle.

Multiply litres of displacement by the specific output: a 2.0 L engine at 60 kW/L makes about 120 kW.

Displacement = π ÷ 4 × bore² × stroke × number of cylinders, with bore and stroke in centimetres for a result in cc.

Related Converters

Tools that use the same inputs or answer the next question.

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