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.