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Parts-Per-Billion to PPM Converter

Convert parts-per-billion (ppb) to parts-per-million (ppm). 1,000 ppb = 1 ppm.

How to use it

  • Enter ppb to calculate ppm.

Examples

5,000 ppb5 ppm

Parts-per-billion (ppb) is a finer-grained unit than parts-per-million (ppm) — 1,000 ppb make up 1 ppm. To convert ppb to the more commonly quoted ppm, divide by 1,000.

Where this comes up

  • Converting a trace-level lab result reported in ppb into the ppm figure used elsewhere in a report
  • Comparing a water quality reading against a regulatory limit stated in a different unit
  • Environmental science and chemistry coursework on concentration units
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Last updated 18 August 2026