°API to SG Converter

This converter utilizes the established industry formula connecting API Gravity (API) to Specific Gravity (Sg). API gravity is defined as 141.5 / (Ratio of density at 60°F to fresh water density in lb/gal). Our tool automates this complex calculation, providing an instant and highly accurate conversion.

The core principle involves understanding that both units measure relative density. When you input the API number (e.g., 35° API), the system calculates the corresponding liquid's true specific gravity against water. For example, a fluid with an API of 40 will convert to an Sg very close to 0.82. Our conversion model ensures that temperature corrections and standard atmospheric pressure assumptions are correctly applied, giving you reliable data for engineering purposes.

• Input: API Gravity value (number).
• Process: Application of the density conversion formula.
• Output: Specific Gravity (Sg) value relative to water at standard temperature.

To ensure the highest level of accuracy when using this API to Sg converter, focus on the quality and context of your input data.

• Source Reliability: Always confirm that the initial API Gravity reading came from a calibrated piece of equipment (like an ASTM standard hydrometer or densitometer).
• Specificity Matters: If you are converting a specialized fluid (e.g., asphalt, kerosene blend), verify if the conversion formula used by this tool is appropriate for that specific material type. Some fluids require unique correction factors.
• Measure Twice: For critical projects, take multiple density readings and input them into the converter to check for consistency. If your measurements vary greatly (e.g., 35 API one day, 38 API the next), investigate potential contamination or measurement variability before finalizing your Sg value.