# Carburetor CFM Calculator

If you want to determine the size of the carburetor that your engine required, then this Carburetor CFM Calculator is a tool that you can use.

A **mechanical device** in which **fuel and air** are **mixed for internal combustion engines** makes a **suitable air-fuel ratio for combustion** known as the **carburetor**. Moreover, the carburetor, also spelled as carburetor, is used to provide the spark-ignition engine that includes a variety of both fuel and air. Choke, liquid fuel, venturi-shaped air-flow restriction, and accelerator pump are included in the storage chamber of components of the carburetor.

**Table of Contents**

## Formula of Carburetor CFM Calculator

If you want to determine the size of a carburetor, you can use our calculator, or to find it manually, you can use the formula listed below:

Carburetor size = Engine size * Max rpm * Efficiency / 3456

**Where,**

Engine size (CID) = size of the vehicle's engine, measured in inches.

Max rpm = maximum revolutions per minute.

Engine efficiency = efficiency of an engine; however, the standard stock engine has approximately 80% efficiency.

**Note:**

To calculate belt length, you can use our Belt Length Calculator.

### Example

For more prices understanding of the above concept, let us have an example below:

Suppose a bike has an engine of 340 cubic inches with a maximum number of revolutions per minute of 5,600, whereas the working efficiency of an engine is 80%. Find out the carburetor size using the above-given data.

**Given data**

Size = 340 cubic inches

Maximum number of revolutions per minute = 5,600 max rpm

Engine efficiency = 80% = 0.80

**To Find**

Carburetor size =?

**Solution**

To find the carburetor size, you can use the formula listed below:

Carburetor size = Engine size * Max rpm * Efficiency / 3456

Putting values in the formula:

Carburetor size = 340 x 5600 x 0.80 / 3456 = 440.74 CFM

### How to use the Carburetor CFM Calculator?

The steps to use the carburetor CFM calculator are as follows:

**Step 1: **Enter the engine size in the first required input.

**Step 2: **Enter the max rpm in the second required input.

**Step 3: **Enter the engine efficiency in the third required input

**Step 4: **The calculator will automatically display an answer on the screen.

### Calculator use

To determine the size of the carburetor an engine should carry, you can use our free and online carburetor CFM calculator. This tool can help you measure your vehicle's efficiency and the area of a carburetor you should use in your engine. You can also use our efficiency calculator to calculate the ratio of energy given to the object.