API Gravity Calculator

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Choose which quantity to solve for. The calculator performs the inverse conversion automatically.
Select a preset to auto-fill a typical reference density at 60 degrees F, or keep Custom to enter your own.
All measurements at 60 degrees F (15.56 degrees C) per the API standard.
Liquid density at 60 degrees F. Select a preset above to auto-fill a typical value.
kg/m3
Specific gravity of the liquid relative to water at 60 degrees F (dimensionless).
Whether to calculate API from a density value or from a specific gravity you already know.
API gravityMedium crude
30.06degrees API

American Petroleum Institute gravity (inverse density scale)

Specific gravity0.8759
Density875kg/m3
Density0.875g/cm3
Density7.3023lb/gal
Density54.624lb/ft3
Crude oil gradeMedium crude
Floats on water?Yes - floats on water
30.06 degrees API
Extra heavy / bitumen<10Heavy crude10-22.3Medium crude22.3-31.1Light crude31.1-45Extra light45+

30.06 degrees API - Medium crude

  • A specific gravity of 0.8759 means this liquid is lighter than water (SG = 1.000).
  • API gravity above 31.1 degrees is considered light crude; above 10 degrees the liquid floats on water.
  • Because SG < 1, this product floats on fresh water, which affects spill response and transport safety planning.
  • Medium crudes are versatile but require more complex refinery processing than light grades to maximise distillate yield.

Next stepAll API gravity values assume a reference temperature of 60 degrees F (15.56 degrees C). Apply a volume correction factor (VCF) from ASTM tables when measuring at other temperatures.

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