About this specific gravity converter
Convert specific gravity, relative density, density units, and API gravity for fluids, petroleum products, quality control, and material comparisons.
Specific gravity is a dimensionless ratio relative to water at 4°C, while API gravity is a petroleum scale where lighter oils have higher API values.
Units covered
Supported scales
Specific gravity, relative density, kg/m³, g/cm³, lb/ft³, oz/in³, and API gravity.
Petroleum use
API gravity support helps compare crude oils and petroleum liquids.
Density reference
SG = 1 corresponds to water at 1000 kg/m³.
How to use it
- Enter specific gravity, density, or API gravity.
- Choose the source and target scale.
- Use API gravity for petroleum liquids and SG for general fluid comparisons.