Physics

API Gravity Calculator

Convert specific gravity to API gravity for petroleum.

Calculated Output

API gravity (°API) 34.971

Formula: API = 141.5 ÷ SG − 131.5

Step-by-Step Breakdown

1. Values used:

2. Specific gravity (60°F) = 0.85

4. API gravity = 34.971°API

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The math behind it

API = 141.5 ÷ SG − 131.5. Above 10 °API floats on water; below 10 sinks.

SG 0.85 → about 34.97 °API.

What is 'light' crude?

Higher API (lower density) oils are called light; they generally fetch more.