API Gravity

API gravity express the gravity or density of liquid petroleum products. Conversion calculator API - specific gravity

API gravity express the gravity or density of crude oil and liquid petroleum products. API is devised jointly by the American Petroleum Institute and the NIST - National Institute of Standards and Technology. The measuring scale is calibrated in terms of degrees API.

API Gravity can be calculated as:

API = (141.5 / SG) - 131.5                                               (1)

where

API = Degrees API Gravity

SG = Specific Gravity (at 60oF)

  • Oil with the least specific gravity has the highest API gravity

SG - API Converter

SG - Specific Gravity

API

Degree APISpecific GravityWeight 
(lb/US gal)(kg/m3)
1 1.068 8.894 1067
5 1.037 8.633 1035
8 1.014 8.447 1013
10 1.000 8.328 998.9
15 0.9659 8.044 964.8
20 0.9340 7.778 933.1
25 0.9042 7.530 903.2
30 0.8762 7.297 875.3
35 0.8498 7.078 848.9
40 0.8251 6.871 824.3
45 0.8017 6.677 800.8
50 0.7796 6.493 778.8
55 0.7587 6.319 757.9
60 0.7389 6.154 738.1
70 0.7022 5.848 701.5
80 0.6690 5.572 668.3
90 0.6388 5.320 638.1

  • There area no clear definition of the different classes of crude oil; extra heavy oil (bitumen), heavy oil, medium oil, light oil, condensate. Different sources and different countries use their own limits. The boxes in the figure indicate the most common ranges used.

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