Relative Density (60/60 ° F) Equivalent to API Gravity at 60 ° F: D 60 60 = 141.5 ÷ ( ° API + 131.5) Solve equation with values of ° API at 60 ° F and round the results to five places past the decimal for further use. Absolute Density at 15 ° C Equivalent to API Gravity at 60 ° F D 15 kg/m 3 = 141.5 ÷ ( ° API + 131.5) x 999.016 x VCF 59 Solve equation with values of ° API at 60 ° F and round the result to two places past the decimal for further use. As this calculation includes a VCF 59 , the result is product specific. API MPMS Ch. 11.1-2004: Crude oils (6A), generalized products (6B), and lubricants (6D). Other products may use different tables. API Gravity at 60 ° F Equivalent to Relative Density (60/60 ° F) ° API = (141.5 ÷ D 60 60 ) - 131.5 Solve equation with values of D 60 60 and round the result to two places past the decimal for further use.
Abbreviations ° API
degrees API gravity
D 15
density at 15 ° C (vac)
D 60
relative density at 60 ° F
60
VCF t
volume correction factor at temp
Absolute Density at 15 °C Equivalent to Relative Density (60/60 °F) D 15 kg/m 3 = D 60 60 x 999.016 x VCF 59 Solve equation with values of D 60
60 and round the result to two places past the decimal for further use. As this calculation includes a VCF 59 , the result is product specific. API MPMS Ch. 11.1-2004: Crude oils (24A), generalized products (24B), and lubricants (24D). Other products may use different tables.
Relative Density (60/60 °F) Equivalent to Absolute Density at 15 °C D 60 60 = (D 15 x VCF 15.5556 ) ÷ 999.016
Solve equation with values of D 15 and round the result to five places past the decimal. As this calculation includes a VCF 15.5556 , the result is product specific. API MPMS Ch. 11.1-2004: Crude oils (54A), generalized products (54B), and lubricants (54D). Other products may use different tables.
API Gravity at 60 °F Equivalent to Absolute Density at 15 °C ° API = (141.5 x 999.016) ÷ (D 15 x VCF 15.5556 ) - 131.5
Solve equation with values of D 15 and round the result to two places past the decimal. As this calculation includes a VCF 15.5556 , the result is product specific. API MPMS Ch. 11.1-2004: Crude oils (54A), generalized products (54B), and lubricants (54D). Other products may use different tables.
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