Enter the total capacity of backed up data before removing duplicates and the capacity after duplicates are removed (post-deduplication) into the Deduplication Ratio Calculator. The calculator will evaluate and display the Deduplication Ratio. 

Deduplication Ratio Calculator

Enter any 2 values to calculate the missing variable

Note: Deduplication ratio is unitless and is typically 1 or greater (before ÷ after).

Deduplication Ratio Formula

The following formula is used to calculate the Deduplication Ratio. 

DEDR = CBB / CAB
  • Where DEDR is the Deduplication Ratio
  • CBB is the total capacity of backed up data before removing duplicates 
  • CAB is the capacity after removing duplicates (post-deduplication) 

To calculate a deduplication ratio, divide the total capacity of backed up data before removing duplicates by the capacity after removing duplicates (post-deduplication).

How to Calculate Deduplication Ratio?

The following example problems outline how to calculate Deduplication Ratio.

Example Problem #1:

  1. First, determine the total capacity of backed up data before removing duplicates.
    • The total capacity of backed up data before removing duplicates is given as: 600.
  2. Next, determine the capacity after removing duplicates (post-deduplication).
    • The capacity after removing duplicates is provided as: 500.
  3. Finally, calculate the Deduplication Ratio using the equation above: 

DEDR = CBB / CAB

The values given above are inserted into the equation below and the solution is calculated:

DEDR = 600 / 500 = 1.2

Example Problem #2: 

For this problem, the variables required are provided below:

total capacity of backed up data before removing duplicates = 800

capacity after removing duplicates (post-deduplication) = 700

Test your knowledge using the equation and check your answer with the calculator above.

DEDR = CBB / CAB = ?