Aisha K.
Mar 12, 2026
Clean layout and the results update instantly. Exactly what I needed for a quick planning check.
Unit Converters
Percentage to Ratio Converter
ratio = (part / gcd) : (whole / gcd).
Reduce part:whole by their gcd. 16 of 100 is 4:25. 1:1 is 50 of 100. Mix ratios for resin are usually mass, not this volume percentage — read the jug.
Part
part → ratio
4:25
16 of 100 is 4:25, not 16:100. Reduce before you put it on a slide.
- Part
- 16
- Whole
- 100
- Fraction
- 0.16
Plain-English guide
Terms & how it works
Confused by a field? Read the short definitions here while you use the tool.
Part
The “Part” value used in this tool’s formula. Adjust it to see results update live.
Whole
The “Whole” value used in this tool’s formula. Adjust it to see results update live.
How this calculator works
Reduce part:whole by their gcd. 16 of 100 is 4:25. 1:1 is 50 of 100. Mix ratios for resin are usually mass, not this volume percentage — read the jug. ratio = (part / gcd) : (whole / gcd). Example: 16 / 100 → 4:25. 50 / 100 → 1:2. 1920 / 1080 → 16:9 if you enter those as part/whole.
ratio = (part / gcd) : (whole / gcd).
Example: 16 / 100 → 4:25. 50 / 100 → 1:2. 1920 / 1080 → 16:9 if you enter those as part/whole.
When to use this Percentage to Ratio
Common use cases
- Reduce part:whole by their gcd. 16 of 100 is 4:25. 1:1 is 50 of 100. Mix ratios for resin are usually mass, not this volume percentage — read the jug.
- Sanity-check with this case: 16 / 100 → 4:25. 50 / 100 → 1:2. 1920 / 1080 → 16:9 if you enter those as part/whole.
- The relationship is: ratio = (part / gcd) : (whole / gcd).
Localized examples
- Unit Converters: the example on this page uses the same formula as the widget.
What you get
- Fields: Part, Whole
- ratio = (part / gcd) : (whole / gcd).
- Example on the page: 16 / 100 → 4:25. 50 / 100 → 1:2. 1920 / 1080 → 16:9 if you enter those as part/whole.
How to Convert Percentage to Ratio Step-by-Step
- 1Enter Part, Whole. Use the values you have, not a catalog average, unless that is all you know.
- 2ratio = (part / gcd) : (whole / gcd).
- 3Worked case: 16 / 100 → 4:25. 50 / 100 → 1:2. 1920 / 1080 → 16:9 if you enter those as part/whole.
- 4Check which dictionary the other person is using — US or UK, decimal or 1,024 — then trust the number.
Governing formula
ratio = (part / gcd) : (whole / gcd).
16 / 100 → 4:25. 50 / 100 → 1:2. 1920 / 1080 → 16:9 if you enter those as part/whole.
Example: set Part = 16, Whole = 100, then read the result.
Variable definitions
- value
Part
The “Part” field. Default 16; typical range 0–100000.
- whole
Whole
The “Whole” field. Default 100; typical range 1–100000.
- The conversion (ratio = (part / gcd) : (whole / gcd).) 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
Part 25 and whole 100 is 25%. The ratio is 1:4.
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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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