Aisha K.
Mar 12, 2026
Clean layout and the results update instantly. Exactly what I needed for a quick planning check.
Unit Converters
Image Compression Ratio Calculator
ratio = compressed / original; saved % = (1 − ratio) × 100.
Ratio = compressed ÷ original. 1.6 / 8 = 0.2, an 80% cut. WebP vs JPEG is a codec argument; this is just the two file sizes. Do not chase 0.05 on a screenshot full of type.
Compressed size
MB → ×
0.2
A 0.2 ratio is an 80% cut. JPEG artifacts are not in the arithmetic.
- Original
- 8 MB
- Compressed
- 1.6 MB
- Saved
- 80 %
Plain-English guide
Terms & how it works
Confused by a field? Read the short definitions here while you use the tool.
Compressed size
The “Compressed size” value used in this tool’s formula. Adjust it to see results update live.
Original size (MB)
The “Original size (MB)” value used in this tool’s formula. Adjust it to see results update live.
How this calculator works
Ratio = compressed ÷ original. 1.6 / 8 = 0.2, an 80% cut. WebP vs JPEG is a codec argument; this is just the two file sizes. Do not chase 0.05 on a screenshot full of type. ratio = compressed / original; saved % = (1 − ratio) × 100. Example: 8 MB RAW-ish preview to 1.6 MB JPEG → 0.20 (80% smaller).
ratio = compressed / original; saved % = (1 − ratio) × 100.
Example: 8 MB RAW-ish preview to 1.6 MB JPEG → 0.20 (80% smaller).
When to use this Image Compression Ratio
Common use cases
- Ratio = compressed ÷ original. 1.6 / 8 = 0.2, an 80% cut. WebP vs JPEG is a codec argument; this is just the two file sizes. Do not chase 0.05 on a screenshot full of type.
- Sanity-check with this case: 8 MB RAW-ish preview to 1.6 MB JPEG → 0.20 (80% smaller).
- The relationship is: ratio = compressed / original; saved % = (1 − ratio) × 100.
Localized examples
- Unit Converters: the example on this page uses the same formula as the widget.
What you get
- Fields: Compressed size, Original size (MB)
- ratio = compressed / original; saved % = (1 − ratio) × 100.
- Example on the page: 8 MB RAW-ish preview to 1.6 MB JPEG → 0.20 (80% smaller).
How to Convert Image Compression Ratio Step-by-Step
- 1Enter Compressed size, Original size (MB). Use the values you have, not a catalog average, unless that is all you know.
- 2ratio = compressed / original; saved % = (1 − ratio) × 100.
- 3Worked case: 8 MB RAW-ish preview to 1.6 MB JPEG → 0.20 (80% smaller).
- 4Check which dictionary the other person is using — US or UK, decimal or 1,024 — then trust the number.
Governing formula
ratio = compressed / original; saved % = (1 − ratio) × 100.
8 MB RAW-ish preview to 1.6 MB JPEG → 0.20 (80% smaller).
Example: set Compressed size = 1.6, Original size (MB) = 8, then read the result.
Variable definitions
- value
Compressed size
The “Compressed size” field. Default 1.6; typical range 0.01–500.
- originalMb
Original size (MB)
The “Original size (MB)” field. Default 8; typical range 0.01–500.
- The conversion (ratio = compressed / original; saved % = (1 − ratio) × 100.) does not pick US vs UK gallons, SI vs binary megabytes, or Mach at altitude for you. Read the footnote on the page.
- Nothing here is uploaded for the calculation itself.
Frequently Asked Questions
If you also resized, say so. This number is bytes only.
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- Decades to YearsA decade is 10 years. The year on this site is the Julian year of 365.25 days used in astronomy, so a decade is 3,652.5 days, not “ten calendars plus guesswork.” History decades (1990s) are labels, not durations.
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Community
Reviews & Ratings
See what others think about this tool, then leave your own rating to help improve CalculioHub.
4.8
out of 5.0
4 reviews
Daniel R.
Feb 28, 2026
Very usable on mobile. Would love a save/export option later, but the math feels solid.
Priya S.
Feb 3, 2026
The FAQ section answered my questions before I even had to search. Smooth dark mode too.
Marcus L.
Jan 19, 2026
Simple inputs, clear outputs. This replaced three bookmarks I used to juggle.
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