API Gravity Calculator

✖Specific Gravity is defined as a measure of the density of a substance in comparison to the density of a reference material.ⓘ Specific Gravity [SG]

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✖API gravity is defined as a measure of how heavy or light a petroleum liquid is compared to water.ⓘ API Gravity [°API]

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Formula

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API Gravity

Formula

`"°API" = (141.5/"SG")-131.5`

Example

`"41.06098"=(141.5/"0.82")-131.5`

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API Gravity Solution

STEP 0: Pre-Calculation Summary

Formula Used

API Gravity = (141.5/Specific Gravity)-131.5
°API = (141.5/SG)-131.5
This formula uses 2 Variables

Variables Used

API Gravity - API gravity is defined as a measure of how heavy or light a petroleum liquid is compared to water.
Specific Gravity - Specific Gravity is defined as a measure of the density of a substance in comparison to the density of a reference material.

STEP 1: Convert Input(s) to Base Unit

Specific Gravity: 0.82 --> No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

°API = (141.5/SG)-131.5 --> (141.5/0.82)-131.5

Evaluating ... ...

°API = 41.0609756097561

STEP 3: Convert Result to Output's Unit

41.0609756097561 --> No Conversion Required

FINAL ANSWER

41.0609756097561 ≈ 41.06098 <-- API Gravity

(Calculation completed in 00.004 seconds)

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Created by Harsh Kadam

Shri Guru Gobind Singhji Institute of Engineering and Technology (SGGS), Nanded

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< 9 Basics of Petrochemicals Calculators

Viscosity Index Mixture

Go Viscosity Index = ((Aromatic's Viscosity-Lube Oil Viscosity)/(Aromatic's Viscosity-Paraffinic Viscosity))*100

BMCI Number

Go Bureau of Mines Correlation Index (BMCI) Number = (48640/Temperature)+(473.7*Specific Gravity)-456.8

Characterisation Factor

Go Characterisation Factor = ((Molal Average Boiling Point)^(1/3))/Specific Gravity

Molal Average Boiling Point Based on Characterisation Factor

Go Molal Average Boiling Point = (Characterisation Factor*Specific Gravity)^3

Aniline Point

Go Diesel Aniline Point = (Diesel Index*100)/API Gravity

Diesel Index

Go Diesel Index = API Gravity*(Diesel Aniline Point/100)

Saybolt Method Viscosity

Go Saybolt Method Viscosity = (0.219*Time)-(149.7/Time)

API Gravity

Go API Gravity = (141.5/Specific Gravity)-131.5

Melt Flow Index

Go Melt Flow Index = Weight of Polymer/10

API Gravity Formula

API Gravity = (141.5/Specific Gravity)-131.5
°API = (141.5/SG)-131.5

How does API Gravity varies for different fluids?

API gravity varies for different fluids depending on their hydrocarbon composition and temperature.

Light crude oil: Light crude oil has an API gravity higher than 31.1° (i.e., less than 870 kg/m3). This is because light crude oil is composed of mostly lighter hydrocarbons, such as methane, ethane, and propane.
Medium crude oil: Medium crude oil has an API gravity between 22.3 and 31.1° (i.e., 870 to 920 kg/m3). This is because medium crude oil is composed of a mixture of lighter and heavier hydrocarbons.
Heavy crude oil: Heavy crude oil has an API gravity below 22.3° (i.e., 920 to 1000 kg/m3). This is because heavy crude oil is composed of mostly heavier hydrocarbons, such as asphaltenes and resins.
Extra heavy oil: Extra heavy oil has an API gravity below 10.0° (i.e., greater than 1000 kg/m3). This is because extra heavy oil is composed of mostly the heaviest hydrocarbons, such as asphaltenes and resins.

How to Calculate API Gravity?

API Gravity calculator uses API Gravity = (141.5/Specific Gravity)-131.5 to calculate the API Gravity, API gravity is defined as a measure of how heavy or light a petroleum liquid is compared to water. API Gravity is denoted by °API symbol.

How to calculate API Gravity using this online calculator? To use this online calculator for API Gravity, enter Specific Gravity (SG) and hit the calculate button. Here is how the API Gravity calculation can be explained with given input values -> 41.06098 = (141.5/0.82)-131.5.

FAQ

What is API Gravity?

API gravity is defined as a measure of how heavy or light a petroleum liquid is compared to water and is represented as °API = (141.5/SG)-131.5 or API Gravity = (141.5/Specific Gravity)-131.5. Specific Gravity is defined as a measure of the density of a substance in comparison to the density of a reference material.

How to calculate API Gravity?

API gravity is defined as a measure of how heavy or light a petroleum liquid is compared to water is calculated using API Gravity = (141.5/Specific Gravity)-131.5. To calculate API Gravity, you need Specific Gravity (SG). With our tool, you need to enter the respective value for Specific Gravity and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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