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Compression Ratio Calculator

Find the compression ratio and space saved between an original and compressed file size.

Inputs

Saved Scenarios

— select 2+ to compare

Compression Ratio

4.00

Space Saved

75.0%

Spark says

How it's calculated

Formula

Ratio=Original SizeCompressed SizeRatio = \dfrac{Original\ Size}{Compressed\ Size}
Original\ Size, Compressed\ Size
— File sizes before and after compression

What is the Compression Ratio Calculator?

Compression ratio compares original file size to compressed size — a higher ratio means more effective compression.

How to use it

  1. 1 Enter the original (uncompressed) file size.
  2. 2 Enter the compressed file size.

Worked examples

100MB compressed to 25MB

Compression ratio is 4:1, saving 75% of space.

Try it

Frequently asked questions

What's a good compression ratio?

It depends heavily on file type — text and code often compress 3-5:1 or more, while already-compressed formats (JPEG, MP4) may barely compress further.