Created By : Rina Nayak

Reviewed By : Rajashekhar Valipishetty

Last Updated : May 15, 2023

Our Simple & easy to use air-fuel ratio calculator is the best online tool that helps you to calculate the rate of air to fuel and the mass of air needed for its complete combustion. To utilize this calculator, give the inputs in the input fields and click on the calculate button then you will get the result instantaneously.

Mass of air [mair]
Mass of fuel [mfuel]
Air Fuel Ratio [AFR]

What is Air Fuel Ratio?

The Air fuel ratio is the ratio between the mass of air and the mass of fuel during combustion. The specific oxygen requirement is expressed as the air-fuel ratio. It dictates the performance of the engine and the efficiency of combustion.

AFR can be calculated by the formula,

Air Fuel Ratio = [Mass of air]/ [Mass of Fuel]

AFR = [mass]air / [mass]fuel

How to Calculate the Air Fuel Ratio(AFR)of Diesel Engine?

Here are some of the following steps to calculate the air fuel ratio. Given below are the steps.

  • First, you need to write down the values that are given in the question.
  • Then apply the air-fuel ratio formula, i.e.,AFR = [mass]air / [mass]fuel
  • Substitute the values in the formula and simplify it.
  • Finally, get the answer easily.

Example Problem to Solve Air Fuel Ratio?

Example: If the mass of air is 15.6 and mass of fuel is 2.8 and find the air fuel ratio?


Given, Mass of air = 15.6 Mass of fuel = 2.7

Apply the formula,

AFR = [mass]air / [mass]fuel

AFR = 15.6 / 2.7 = 5.7777

Therefore, the air fuel ratio is 5.77777

Checkout this wonderful tool for more chemistry calculators if you like this calculator to use it for you.

FAQs on AFR(Air Fuel Ratio) Calculator

1. How do you calculate air to fuel ratio??

Air to Fuel ratio can be calculated by using the formula, AFR = [mass]air / [mass]fuel.

2. How to use air to fuel ratio calculator

Simply, give the inputs in the input field and click on the calculate button that give you the exact result in fraction of seconds.

3. What is Air to fuel ratio?

Air to fuel ratio is the ratio between the mass of air and mass of fuel during combustion.

4. What does 14.7 AFR mean?

Fuel doesnt burn on its own. It has to be mixed with air. AFR tell you how many parts of air should be mixed with each part of fuel. For example, 14.7:1 AFR is 14.7 parts of air for one part of fuel.