Percent to parts per million
Type a value in % to get it in ppm instantly.
500,000ppm
That's 417× as strong as an immediately dangerous level — nothing on our list beats it. That is about one molecule of it in every 2 of air.
What it means
What is in the air?
Weight-per-volume figures assume 25 °C and one atmosphere. A hot or high-altitude measurement needs its own molar volume.
The math
How to convert % to ppm
To convert percent to parts per million, multiply by 10,000.
Example: 50 % × 10,000 = 500,000 ppm.
In the other direction, 1 ppm = 0.0001 %.
The table below is for Carbon monoxide, CO (28.01 g/mol), using its molar mass.
Every unit
Your concentration in every unit
Tables
% to ppm conversion table
| % | ppm |
|---|---|
| 0.1 % | 1,000 ppm |
| 0.5 % | 5,000 ppm |
| 1 % | 10,000 ppm |
| 5 % | 50,000 ppm |
| 10 % | 100,000 ppm |
| 25 % | 250,000 ppm |
| 50 % | 500,000 ppm |
| 100 % | 1,000,000 ppm |
| 200 % | 2,000,000 ppm |
| 500 % | 5,000,000 ppm |
| 1,000 % | 10,000,000 ppm |
ppm to % conversion table
| ppm | % |
|---|---|
| 0.1 ppm | 1×10⁻⁵ % |
| 0.5 ppm | 5×10⁻⁵ % |
| 1 ppm | 0.0001 % |
| 5 ppm | 0.0005 % |
| 10 ppm | 0.001 % |
| 25 ppm | 0.0025 % |
| 50 ppm | 0.005 % |
| 100 ppm | 0.01 % |
| 200 ppm | 0.02 % |
| 500 ppm | 0.05 % |
| 1,000 ppm | 0.1 % |
Quick answers
Quick answers
- How many ppm is 1 %?
- 1 % is 10,000 ppm.
- How many ppm is 10 %?
- 10 % is 100,000 ppm.
- How many ppm is 50 %?
- 50 % is 500,000 ppm.
The units
About these units
Percent (%)
For high concentrations, such as CO₂ in a confined space.
Parts per million (ppm)
Parts by volume, the unit every gas detector reads in.
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