Online Tool Store
Parts Per Converter
Type into any of percent, ppm, ppb, or ppt and see the other three update live — no "Convert" button. Runs entirely in your browser.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Example shown — edit any field, the other three update instantly.
How it works
- Type a value into any of the four fields — percent, ppm, ppb, or ppt.
- The other three fields update instantly, converted from what you typed.
- Use "Copy all values" to copy every unit's value to your clipboard at once.
Each unit is a fixed fraction — percent is parts per hundred, ppm is parts per million, ppb is parts per billion — so converting between them is a matter of multiplying or dividing by the right power of ten.
FAQ
Is my data uploaded anywhere?
No. Conversion happens entirely in your browser — nothing is sent to a server.
What units are supported?
Percent, ppm (parts per million), ppb (parts per billion), and ppt (parts per trillion) all convert to each other.
Where are these units commonly used?
Chemistry, water quality, air quality, and pollutant concentration measurements most often use ppm and ppb.
How precise is the conversion?
Conversions are exact — each unit is a fixed power-of-ten fraction, so there's no rounding error beyond floating-point display precision.
Do I need to press a "Convert" button?
No — type into any of the four fields and the other three update instantly as you type, in either direction.
Can I copy the converted values?
Yes — "Copy all values" copies all four numbers as plain text (one unit per line) to your clipboard.
How we compare
| Feature | Online Tool Store | Other ppm/percent converter sites | Spreadsheet formula |
|---|---|---|---|
| Shows every unit at once | ✓ | One conversion at a time | ✓ |
| Updates live as you type — no button to press | ✓ | Requires a "Convert" click | ✓ |
| Free, no setup | ✓ | ✓ | Needs the formula memorized |
Most converter sites convert one pair of units per click of a "Convert" button. Parts Per Converter shows percent, ppm, ppb, and ppt all at once, live, and lets you edit any of the four.