Cetane Index Calculator

How to determine the cetane index of diesel fuel? Our Cetane Index Calculator can help you to find out. For calculation, enter specific values into the calculator to find the cetane index of your fuel quickly.

Cetane Index Calculator

Cetane Index Calculator

Enter any 2 values to calculate the missing variable






















Cetane Index Calculator tool

What is the Cetane Index?

The Cetane Index is a measure of the combustion quality of diesel fuel. It estimates how quickly the fuel will ignite in the engine, which affects performance and emissions. A higher cetane index means better combustion efficiency.

How to Use the Cetane Index Calculator

To use the calculator is simple. Enter the following values into the input fields:

  • Specific Gravity at 60°F (SG)
  • Aniline Point in °F (A)

For a more advanced calculation, you can also input:

  • Viscosity at 40°C (cSt)

Example Input Values

1. Basic Calculator:

    • Specific Gravity (SG): 0.85
    • Aniline Point (A): 120°F

2. Advanced Calculator:

    • Specific Gravity (SG): 0.85
    • Aniline Point (A): 120°F
    • Viscosity at 40°C: 2.5 cSt

How to Calculate the Cetane Index

The formula to calculate the Cetane Index (CI) is:

CI=(454.541640.6×SG)+(774.74×A)0.554\text{CI} = (454.54 – 1640.6 \times \text{SG}) + (774.74 \times \text{A}) – 0.554

Variables:

Variable Description
CI Cetane Index
SG Specific Gravity at 60°F
A Aniline Point in °F

Calculation

1. Identify Values:

    • Specific Gravity (SG): 0.85
    • Aniline Point (A): 120°F

2. Apply the Formula:

CI=(454.541640.6×0.85)+(774.74×120)0.554\text{CI} = (454.54 – 1640.6 \times 0.85) + (774.74 \times 120) – 0.55

3. Calculate Intermediate Steps:

1640.6×0.85=1394.511640.6 \times 0.85 = 1394.51

774.74×120=92968.8774.74 \times 120 = 92968.8

4. Complete the Calculation:

CI=(454.541394.51)+92968.80.554=

939.97+92968.80.554=92028.276\text{CI} = (454.54 – 1394.51) + 92968.8 – 0.554 = -939.97 + 92968.8 – 0.554 = 92028.27

Inputs Examples

1. Basic

Input Values Calculation
Specific Gravity (SG): 0.85 CI=(454.541394.51)+92968.80.554CI = (454.54 – 1394.51) + 92968.8 – 0.554

 

Aniline Point (A): 120°F CI=92028.276CI = 92028.276

 

2. Advanced

Input Values Calculation
Specific Gravity (SG): 0.85 CI=(454.541394.51)+92968.80.554CI = (454.54 – 1394.51) + 92968.8 – 0.554

 

Aniline Point (A): 120°F  
Viscosity at 40°C: 2.5 cSt  

FAQs

What is the Cetane Index?

The Cetane Index indicates the ignition quality of diesel fuel and how quickly it will ignite in an engine.

Why is the Cetane Index important?

A higher Cetane Index indicates better combustion efficiency, which will improve the engine’s performance at a lower emission level.

Can I use this calculator for all kinds of diesel fuel?

Yes, the purpose of this calculator is to estimate the cetane index of various diesel fuel types.

Conclude

How did you find our Cetane Index Calculator? I hope it was helpful and easy to use. Please share your experience and feedback. Your input helps us improve our tools for better user experience.

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