PPM Calculator

What Is a PPM Calculator?

A PPM calculator converts between common concentration and proportion units: percent (%), per mille (‰), parts per million (ppm), parts per billion (ppb), and parts per trillion (ppt). Enter a value in any unit and get equivalent results in all other units instantly.

How Concentration Units Relate

All these units express a ratio of part to whole. They differ only by the divisor used:

• Percent: divide by 100
• Per mille: divide by 1,000
• PPM: divide by 1,000,000
• PPB: divide by 1,000,000,000
• PPT: divide by 1,000,000,000,000

The general conversion formula is:

$$ \text{Decimal fraction} = \frac{\text{Value}}{\text{Unit divisor}} $$

For example, 5 ppm equals 0.000005 as a decimal, which is 0.0005% or 0.005‰. One percent equals 10,000 ppm.

Practical Examples

Drinking water regulations often cite contaminants in ppb or ppt. Air quality standards use ppm for gases like CO₂. Industrial solutions may be labeled in percent or per mille. This calculator handles any of these inputs with adjustable precision.

Related tools: PPM to Milligrams per Liter Converter and PPM to Molarity Calculator.