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Infrastructure & Storage

Compression Ratio Calculator

Compare original data size with its compressed stored size.

Calculations run in your browser. The tool does not send your inputs to a server.

01Your inputs

Local workspace

Start with the sample below, or enter your own values.

Enter a numeric value using the unit shown in the label.
Enter a numeric value using the unit shown in the label.

02Your result

Your result will appear here. Choose an action after checking your inputs.

A quick guide

How to use this tool

  1. Check the example and the unit beside each input.
  2. Enter your values and choose Calculate.
  3. Review the result and assumptions, then copy what you need.

Reset example restores the starting values. Clear removes text and number inputs, returns choices to their first valid option, and removes the result.

Reference guide

Explanation and worked examples

1,000 units reduced to 400 gives 2.5:1 compression and 60% savings. Use the same unit for both sizes.

Use in day-to-day IT work

Prepare a storage, virtualisation or backup sizing estimate for a change request.

Checks before applying the result

  • Keep decimal GB/TB and binary GiB/TiB consistent with the measured system.
  • Reserve space for growth, platform overhead and failure recovery; validate performance with a representative workload.
New to the terminology?
IOPS
Input/output operations completed each second.
GiB vs GB
GiB uses powers of 1,024; GB uses powers of 1,000.
Overcommit
Allocating more virtual resources than physically available.

Keep exploring

RAID CalculatorStorage Unit ConverterIOPS CalculatorIOPS to Throughput Calculator

How calculations work and where the models stop →