Specific gravity to degrees API
Type a value in SG to get it in °API instantly.
-127.5°API
That's 34× as heavy as oil sands bitumen — nothing on our list beats it. That is extra-heavy crude or bitumen, and it sinks in water.
Convert the other way: °API to SG
What it means
How heavy is that oil?
API gravity is defined at 60 °F. Oil expands with heat, so a field measurement must be corrected to that temperature before the number means anything.
The math
How to convert SG to °API
The API scale is built around water at 10: °API = 141.5 ÷ SG − 131.5, and back again SG = 141.5 ÷ (°API + 131.5). Because SG is on the bottom, the scale runs backwards.
Example: 35 SG = -127.457 °API.
Every unit
Your gravity in every unit
Tables
SG to °API conversion table
| SG | °API |
|---|---|
| 5 SG | -103.2 °API |
| 10 SG | -117.35 °API |
| 15 SG | -122.067 °API |
| 20 SG | -124.425 °API |
| 25 SG | -125.84 °API |
| 30 SG | -126.783 °API |
| 35 SG | -127.457 °API |
| 40 SG | -127.963 °API |
| 45 SG | -128.356 °API |
| 50 SG | -128.67 °API |
| 60 SG | -129.142 °API |
°API to SG conversion table
| °API | SG |
|---|---|
| 5 °API | 1.03663 SG |
| 10 °API | 1 SG |
| 15 °API | 0.96587 SG |
| 20 °API | 0.933993 SG |
| 25 °API | 0.904153 SG |
| 30 °API | 0.876161 SG |
| 35 °API | 0.84985 SG |
| 40 °API | 0.825073 SG |
| 45 °API | 0.8017 SG |
| 50 °API | 0.779614 SG |
| 60 °API | 0.738903 SG |
Quick answers
Quick answers
- How many °API is 1 SG?
- 1 SG is 10 °API.
- How many °API is 10 SG?
- 10 SG is -117.35 °API.
- How many °API is 35 SG?
- 35 SG is -127.457 °API.
The units
About these units
Specific gravity (SG)
Density relative to water at 60 °F.
Degrees API (°API)
The petroleum industry standard. Water is 10; higher means lighter.
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