Enter the half-life time into the Calculator. The calculator will evaluate the Elimination Rate Constant. 

Elimination Rate Constant Formula

k = .693 / t-1/2


  • k is the Elimination Rate Constant ()
  • t-1/2 is the half-life time

To calculate Elimination Rate Constant, divide .693 by the half-life time.

How to Calculate Elimination Rate Constant?

The following steps outline how to calculate the Elimination Rate Constant.

  • First, determine the half-life time. 
  • Next, gather the formula from above = k = .693 / t-1/2.
  • Finally, calculate the Elimination Rate Constant.
  • After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

half life time = 50