Specific gravity conversion calculator

API and Baume specific gravity

online since 2010

pipe flow calculator


A calculator with which you can convert specific densities between several commonly used sizes used in the oil industry - API, Baume and Imperial.

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  • Switch between metric and imperial units in one click
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Calculation setup
Specific gravity
Specific volume and density

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SG - specific gravity
Ratio of the liquid density to the water density at specific temperature
American Petroleum Institute gravity. It's a measure of how heavy or light a petroleum liquid is compared to water. If its API gravity is greater than 10, it is lighter and floats on water. If less than 10, it is heavier and sinks
Density of the liquid in Baumé scale
v - specific volume
Specific volume of the liquid
ρ - Density
Liquid density - mass to volume ratio

Calculation setup

Select value to input. Calculator will give you all the rest
input specific gravity
input liquid gravity in API degrees
input density is Baume degrees
Lighter than water
Pressed if liquid is lighter than water - only if Baume is selected to input

When is this calculator suitable?

Specific gravity conversion calculator can be used for conversion between API degrees, Baume degrees and specific gravity and is applicable for all liquids, but most common application is for oils. Specific gravity is ratio of some liquid density divided by water density, at referenced temperature. As liquids are having different gravity on different temperature, for this calculator 60 degrees F (60 0F; 15.6 0C) is used as reference temperature - SG (60 0F/60 0F).

Calculator also calculates liquid density ρ in [lb/gallon] and specific volume v, in [barrels/MT] (barrels/metric tons) units.

Conversion in API degrees is for liquids with specific gravity lower than 1, which means for liquids lighter than water. Conversion in Baume degrees is for liquids with specific gravity higher or lower than 1, which means for liquids heavier or lighter than water.

Calculator description

Calculator use following equations for conversion between API and Baume degrees.

For oils specific gravity SG(60OF/60OF):

oil specific gravity

For liquids lighter than water SG(60OF/60OF):

oil specific gravity

For liquids heavier than water SG(60OF/60OF):

oil specific gravity

As the density of water at 15OC is 999 kg/m3, density of oil or other liquid can be calculated as: water density x SG(60OF/60OF).

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resistance factor K for flow in valves and fittings
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compressible isothermal flow
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