GloboMechanic is reader-supported. When you purchase through links on our site, we may earn an affiliate commission at no extra cost to you.

Engine Displacement Calculator and Converter – [FREE]

Knowing the exact engine displacement allows you to keep track of engine performance and fuel consumption. You can also tell if you need an upgrade in the future.

It is possible to calculate the displacement manually. Apart from that, online engine displacement calculator is a pretty useful tool to calculate the engine size either in the imperial (cubic inches) or metric unit (cubic centimeters and liters).


Cubic Inch to Liter Engine Conversion


What is Engine Displacement?

It is the total working/swept volume your engine would have combining all the pistons that move in and out. In other words, it represents the dynamic response or combustion capacity of the engine.

Usually, it is expressed in cubic centimeters (CC/cm3) and sometimes in liters (L). Surely you have seen writings like 4.2L, 3.5L or 2000cc, 3000cc, and so on.

This metric also gives a rough idea of the maximum fuel consumption of the engine. You will see this measurement in most auto advertisements or in discussions relating to vehicles or engines.

Is Engine Displacement Same as CC?

Yes, The CC stands for Cubic Centimeter, that’s how we measure the inside of a cylinder. That brings us to the fact the engine displacement number does a similar thing. It specifies the total amount of space you have joining all the cylinders.

In the combustion engine, there you will see several chambers where pistons move up and down due to internal combustion. If you can manage to measure up the total amount, that’s your engine displacement and that’s occasionally denoted by CC.

What Does 2.0 Liter Engine Mean?

In short, it means your engine has a total of 2 liters or 2000cc of space in all the cylinders combined. This could also be your vital determinant factor for horsepower and fuel consumption measurement. 

So if you have a higher displacement engine you will have higher torque and horsepower. At the same time, as your displacement increases your fuel consumption will also rise.

How many cubic inches is a 6.2-liter engine?

So you have seen an engine or auto spec sheet and found the engine displacement is 6.2 liters, but you want to convert it to Cubic Inches. In America’s customary units system Cubic inches, cu in, or in3 is the most common unit of volume.

There is an easy way to convert displacement volume to Cubic inches that are in a liter. Just multiply 61.024 with the numbers of the liter. Because 1 liter is equivalent to 61.0241Cubic inches. Therefore, 6.2 x 61.024 is = 378.347 Cubic Inches.

How to Calculate Engine Displacement?

Whenever you discuss engine displacement you are ultimately talking about pistons and how much space they cover during their motion. Pistons move in the round contraption we call cylinders. Depending on the engine size there could be at least one piston or more than that.

So, if you want to calculate Engine Displacement manually, you need to measure the volume of each cylinder through diameter (bore) and length. Once you have that, multiply the number with the number of the piston you have, and you’ll get the total displacement.

You can also get help from our free online engine displacement calculator if you have the measurement. 

What is the Engine Displacement Formula?

In short, if you can add up all the volume measurement of the cylinder you will have full engine displacement. Here is the quick formula. 

Piston radius2 × Piston stroke length × Number of piston × Value of Pi π = Engine Displacement.

How is Engine Displacement Measured?

You will need 4 types of value and the following formula to measure Engine displacement (D).

  • Piston Radius (R)
  • Piston Stroke length (L)
  • Number of the piston (P)
  • Value of Pi (3.14)

R2×L×P× (Pi) = D

For example, let’s say your piston radius is 5 Inch, piston length is 13 inch and you have 3 pistons. So your engine displacement measurement would look something like this.

52×13×3×3.14 = 3061.5

That means your engine displacement is around 3.06L or 3061cc.

How Can I Change the Displacement on an Engine?

Technically, there are only three common ways to change displacement on your existing engine.

Increasing piston diameter: By changing the diameter of each piston, you can increase total engine displacement. You need to increase both the cylinder and the piston size.

Rising stroke length: Another way to increase engine displacement is by raising the stroke length. You can achieve this by modifying the crankshaft.

Reducing cylinders: In case you want to downsize the displacement and the amount of friction then reducing the number of cylinders in your engine would be necessary. 

Note that, implementing these methods is expensive and requires expert attention. There are a lot of sophisticated and technical works involved in getting the final result.

How to Increase Engine Displacement?

It’s not that easy of a task to increase your Engine Displacement in a day. This particular operation needs highly technical skills and access to advanced equipment. 

So if you remember the displacement formula that is – Piston radius2 × Piston stroke length × Number of piston × Value of (Pi). You just need to increase the piston radius or the stroke length. It’s also possible to change both and have the same effect.

What is the largest displacement engine?

In general sense, the world’s largest displacement size is 1,810 liters or 1,810,000cc. The Wärtsilä RT-flex96C is a diesel engine with fourteen giant cylinders.

From a commercial vehicle perspective, Chrysler SRT Viper is the largest street-legal engine in the current market. It has a V-10 engine with 8.4-liter displacement.

Engine Displacement vs. Horsepower – What’s the difference?

Engine Displacement aka Cubic Capacity refers to the combustion capacity of the engine in relation to its overall size and weight. On the other hand, horsepower reflects the engine’s power or maximum output within a specific time. 

Although there is no direct link between them it is generally assumed that higher engine displacement leads to an increase in horsepower. The relationship isn’t necessarily linear or practical on every occasion.

You may also like