API Gravity - API Gravity Formulas

API Gravity Formulas

The formula to obtain API gravity of petroleum liquids, from specific gravity (SG), is:

Conversely, the specific gravity of petroleum liquids can be derived from the API gravity value as

Thus, a heavy oil with a specific gravity of 1.0 (i.e., with the same density as pure water at 60°F) would have an API gravity of:

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