Enter the API into the Density From API Calculator. The calculator will evaluate and display the Density From API. 

Density From API Formula

The following formula is used to calculate the Density From API. 

D = 141.5/(API+131.5) * 998.9

  • Where D is the Density From API (kg/m^3)
  • API is the API 

How to Calculate Density From API?

The following example problems outline how to calculate Density From API.

Example Problem #1:

  1. First, determine the API. 
    1. The API is given as: 55.
  2. Finally, calculate the Density From API using the equation above: 

D = 141.5/(API+131.5) * 998.9

The values given above are inserted into the equation below:

D = 141.5/(55+131.5) * 998.9 = 757.878 (kg/m^3)


Example Problem #2: 

For this problem, the variables needed are provided below:

API = 65

This example problem is a test of your knowledge on the subject. Use the calculator above to check your answer. 

D = 141.5/(API+131.5) * 998.9 = ?