How does the Data Compression Ratio work?

Compression Ratio = Original Size ÷ Compressed Size Then: Space Saving % = (1 − 1/Ratio) × 100 Then: Lossless: exact original recoverable (ZIP, PNG, FLAC) Then: Lossy: some data discarded for higher ratios (JPEG, MP3).

Can you give an example of how to use the Data Compression Ratio?

Example: Input 100MB → 35MB compressed gives a result of Ratio 2.86:1, saving 65%.

Is the Data Compression Ratio free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Data Compression Ratio?

Our Data Compression Ratio uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

Practic

Data Compression Ratio

Original Size (MB)

Compressed Size (MB)

A data compression ratio calculator measures how effectively a compression algorithm reduces file size. A ratio of 3:1 means the compressed file is one-third the size of the original.

Symbol	Name	Unit	Description
S_orig	Original size	bytes	Uncompressed file size
S_comp	Compressed size	bytes	Compressed file size
ratio	Compression ratio	(dimensionless)	How many times smaller the compressed file is

Format/Algorithm	Type	Typical Ratio
ZIP (text)	Lossless	2:1 – 5:1
ZIP (already compressed)	Lossless	~1:1
JPEG (photo)	Lossy	5:1 – 15:1
MP3 (audio)	Lossy	10:1 – 12:1
H.264 (video)	Lossy	20:1 – 100:1
FLAC (audio)	Lossless	2:1 – 3:1

References

›Data compression overview — Wikipedia

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