How is API gravity converted to specific gravity?

The tool uses the industry formula: Specific Gravity = 141.5 / (API Gravity + 141.5). This calculates the ratio of the fluid's density to that of water at 60°F.

Can I convert specific gravity back to API gravity?

This particular converter only converts from API gravity to specific gravity. The reverse calculation requires a different formula or tool.

Does the conversion account for temperature?

The tool applies standard industry assumptions for temperature and pressure. For precise engineering work, additional temperature corrections may be necessary.

What does a high API gravity number indicate?

A higher API gravity number indicates a lighter fluid with a lower specific gravity, meaning it is less dense than water. Fluids with API gravity above 10° are lighter than water.

Materials & MeasurementFree Tool

Api gravity to Specific Gravity Density Converter

Provided byNumber Convertnumberconvert.com

Convert API Gravity to Sg instantly. Free online converter with accurate results and clear explanations.

Use This Tool

Screenshot of Api gravity to Specific Gravity Density Converter on Number Convert — numberconvert.comOpen the live tool →

About this tool

What Api gravity to Specific Gravity Density Converter does

This online utility instantly converts API gravity readings into specific gravity density values using the standard industry formula. Users input an API gravity number, and the tool outputs the corresponding specific gravity relative to water at 60°F, eliminating the need for manual calculation. The result provides a precise density measurement useful for comparing fluid characteristics across different measurement systems. The site presents the conversion in a straightforward format, focusing on the mathematical relationship between the two units without unnecessary complexity. It serves as a quick reference for professionals and hobbyists who need to translate API readings into the specific gravity values required for engineering, blending, or regulatory purposes. The tool handles the underlying physics so the user does not have to look up or apply the formula manually.

Step by step

How to use the Number Convert Api gravity to Specific Gravity Density Converter

1
Enter the API gravity value into the input field
2
The calculator automatically processes the value using the established conversion formula
3
The resulting specific gravity appears instantly as the output
4
Review the displayed Sg value relative to water at standard temperature
5
Use the converted density for material compatibility, blending, or regulatory reporting

Is it right for you

Best for

Engineers, geologists, and petroleum professionals who need to standardize density measurements taken in API units into specific gravity for equipment design, material compatibility, or regulatory reporting.

Limitations

Results are based on standard temperature assumptions and may require adjustment for non-standard conditions
The tool performs a one-way conversion from API to specific gravity only
Output reflects relative density and does not provide absolute density in other units like kg/m³

Questions

Api gravity to Specific Gravity Density Converter FAQ

How is API gravity converted to specific gravity?: The tool uses the industry formula: Specific Gravity = 141.5 / (API Gravity + 141.5). This calculates the ratio of the fluid's density to that of water at 60°F.
Can I convert specific gravity back to API gravity?: This particular converter only converts from API gravity to specific gravity. The reverse calculation requires a different formula or tool.
Does the conversion account for temperature?: The tool applies standard industry assumptions for temperature and pressure. For precise engineering work, additional temperature corrections may be necessary.
What does a high API gravity number indicate?: A higher API gravity number indicates a lighter fluid with a lower specific gravity, meaning it is less dense than water. Fluids with API gravity above 10° are lighter than water.