Technical Calculators

Interactive engineering models for petroleum logistics, refining classifications, and volume/mass conversion dynamics.

API Gravity

Hydrometer Model

Specific Gravity (SG)Ratio to H₂O @ 60°F

The American Petroleum Institute gravity is an inverse measure determining how heavy or light a petroleum liquid is compared to water. Formula: (141.5 / SG) - 131.5

Diagnostic Output

--°API

Invalid Crude

Please enter a valid specific gravity.

10°22.3°31.1°Light+

Volume matrix

Global Logistics

Base Volume

Unit

Density Factor (For Mass Conv.)

bbl / metric tonne

Standard assumption is 7.33 bbl/tonne (approx 32° API).

Converted Metrics

Barrels (US)1

Metric Tonnes0.14

Gallons (US)42

Liters159

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About Our Calculations

PetroEyes technical calculators utilize industry-standard formulas (such as the standard API Gravity derivation from specific gravity relative to water at 60°F) and accepted average conversion factors (e.g., 7.33 bbl/tonne for 32° API crude). However, these tools are for educational and broad market analysis purposes only and should not replace certified custody-transfer engineering tools.

Important: Educational Purposes OnlyThe commodities data, price charts, oil market analysis, and economic insights provided on PetroEyes.com are for informational and educational purposes only. They do not constitute certified financial, trading, or investment advice. Global energy markets are highly volatile and subject to geopolitical risks. Always perform your own due diligence and consult with a registered financial advisor before making commodity trading or investment decisions.