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.
- 1Compression Ratio = Original Size ÷ Compressed Size
- 2Space Saving % = (1 − 1/Ratio) × 100
- 3Lossless: exact original recoverable (ZIP, PNG, FLAC)
- 4Lossy: some data discarded for higher ratios (JPEG, MP3)
100MB → 35MB compressed=Ratio 2.86:1, saving 65%
1GB video → 250MB=Ratio 4:1, saving 75%
ZIP typical text file=Ratio 2:1 to 5:1 typical
| 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
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