๐ŸงชConcentration Unit Converter

Convert between ppm, ppb, ppt, %, mg/L, g/L instantly

How to Use the Concentration Unit Converter

Enter a concentration value, select the source unit, and all six unit conversions appear instantly. Zero is a valid input. Useful for water quality, air quality, chemistry, and food safety work.

Unit Overview

ppm (parts per million): Most common concentration unit. Used in water quality, air pollution, and food safety. 1 ppm = 1 mg/kg = ~1 mg/L (for water).

ppb (parts per billion): 1,000ร— smaller than ppm. Used for trace contaminants in drinking water and environmental standards. 1 ppm = 1,000 ppb.

ppt (parts per trillion): 1,000ร— smaller than ppb. Used for ultra-trace analysis. 1 ppb = 1,000 ppt.

% (percent): 1% = 10,000 ppm. Used for higher concentrations like alcohol content or salt concentration.

mg/L, g/L: Mass per volume units for solutions. For water, 1 mg/L โ‰ˆ 1 ppm; 1 g/L = 1,000 ppm.

FAQ

US drinking water limit for lead is 15 ppb โ€” what is that in ppm?

15 ppb = 0.015 ppm = 0.015 mg/L. Enter 15 with ppb selected and all conversions appear instantly.

A 5% bleach solution โ€” how many ppm is that?

5% = 50,000 ppm. For disinfection purposes, diluted solutions are typically measured in hundreds of ppm. Enter 5 with % selected to see all conversions.