Handy Units
PPM to Percentppm → %
1 ppm = 0.0001 % · 1 % = 10,000 ppm
Formula
% = ppm ÷ 10000
Example: 400 ppm = 400 ÷ 10000 = 0.04 %
These units differ only by a fixed factor: multiply by it to convert, divide to go back. The factors are exact international definitions (for example 1 inch = 2.54 cm exactly); results are rounded only for display.
PPM and Percent chart
| PPM (ppm) | Percent (%) |
|---|---|
| 1 ppm | 0.0001 % |
| 10 ppm | 0.001 % |
| 100 ppm | 0.01 % |
| 400 ppm | 0.04 % |
| 1,000 ppm | 0.1 % |
| 10,000 ppm | 1 % |
| Percent (%) | PPM (ppm) |
|---|---|
| 0.01 % | 100 ppm |
| 0.1 % | 1,000 ppm |
| 0.5 % | 5,000 ppm |
| 1 % | 10,000 ppm |
| 5 % | 50,000 ppm |
| 10 % | 100,000 ppm |
| 50 % | 500,000 ppm |
| 100 % | 1,000,000 ppm |
About these units
Parts per million (ppm)Parts per million: 1 ppm = 0.0001%. Used for water quality and CO₂ in the air.
Percent (%)Percent: 1% = 0.01.
Questions
How many Percent are in 1 PPM?
1 ppm = 0.0001 %.
How many PPM are in 1 Percent?
1 % = 10,000 ppm.