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Calcimator

API Gravity Calculator

Convert specific gravity to API gravity for crude oil classification and pricing.

Inputs

°F

Results

API Gravity (at 60°F)

30.03°API

API Gravity (Uncorrected)30.03°API
Corrected Specific Gravity0.88
Crude Classification3
Density7.31 lb/gal
Barrels per Metric Ton7.18 bbl/MT
How to Use This Calculator
  1. Enter Specific Gravity and Observed Temperature.
  2. Review the API Gravity (at 60°F) (°API) result.
  3. Use API Gravity (Uncorrected) (°API) and Corrected Specific Gravity to inform your decision.
  4. Use the chart to visualize the results and explore different scenarios by adjusting inputs.

How the result changes with Specific Gravity

Specific GravityAPI Gravity (at 60°F)
0.6104.33°API
0.8534.97°API
1.15-8.46°API
1.4-30.43°API

What each input means

Specific Gravity
Ratio of oil density to water density at 60°F. Lighter crudes have lower SG values.
Observed Temperature
Temperature at which the specific gravity was measured. Standard reference is 60°F.

What each result means

Crude Classification
1=Extra Heavy, 2=Heavy, 3=Medium, 4=Light

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    Specific Gravity = 0.876, Observed Temperature = 60 = 2 input(s) provided
  2. Calculate API Gravity
    API Gravity
    30.03 = 30.03
  3. Calculate API Gravity
    30.03 = 30.03
  4. Calculate Corrected Specific Gravity
    Corrected Specific Gravity
    0.876 = 0.876

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