PPM to Parts-Per-Billion Converter

Parts-per-billion (ppb) measures even smaller concentrations than parts-per-million (ppm). Since a billion is 1,000 times a million, 1 ppm = 1,000 ppb — multiply by 1,000 to convert.

Where this comes up

• Trace contaminant testing in drinking water, where regulatory limits are often set in ppb (lead, arsenic, pesticide residues)
• Environmental and toxicology reports needing finer resolution than ppm provides
• Semiconductor manufacturing purity specs, which are commonly stated in ppb