Measure file shrinkage with ratio, factor, savings, and recovery views. Enter your known values carefully. Fast layouts, exports, formulas, examples, charts, and helpful answers.
Use one of four solving modes. Results appear above this form after submission.
These examples use the same mathematical rules as the calculator.
| Case | Original Size | Compressed Size | Compression Ratio | Reduction |
|---|---|---|---|---|
| Text Archive | 120 MB | 30 MB | 4 : 1 | 75% |
| Log Bundle | 450 MB | 150 MB | 3 : 1 | 66.67% |
| Image Pack | 2.4 GB | 1.2 GB | 2 : 1 | 50% |
| Backup Set | 900 MB | 225 MB | 4 : 1 | 75% |
| Spreadsheet Export | 80 MB | 64 MB | 1.25 : 1 | 20% |
Compression Ratio = Original Size / Compressed Size
Reduction % = ((Original Size - Compressed Size) / Original Size) × 100
Compressed Size = Original Size / Compression Ratio
Original Size = Compressed Size × Compression Ratio
Compressed Size = Original Size × (1 - Reduction % / 100)
A compression ratio compares the original size to the compressed size. A value of 4:1 means the original data was four times larger than the reduced version.
Not always. A higher ratio saves more space, but it may require more processing time or affect recovered quality in some systems. Balance efficiency with your actual use case.
The ratio shows how many times larger the original value is. Reduction percentage shows the share removed from the original. Both describe the same change in different ways.
Yes. Some inputs may expand after processing. In that case, the calculator reports expansion, and the difference becomes extra size instead of saved space.
Yes. You can enter original and compressed values in different units. The calculator converts both values into a common base before applying the formulas.
Decimal units keep the math simple and consistent for general size comparisons. They are also widely used in storage marketing, reporting, and data transfer calculations.
It is the original-size estimate obtained from the compressed value and the ratio. In direct calculations, it should match the original size after rounding.
You can use it for files, backups, images, exported tables, logs, archives, or any mathematical shrinkage problem involving an original value and a reduced value.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.