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Parts Per Converter

Parts Per Converter

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What this does

Converts concentration between percent, per mille, ppm (parts per million), ppb (parts per billion) and ppt (parts per trillion).

Handy anchors

  • 1% = 10,000 ppm. 1 ppm = 1,000 ppb. 1 ppm in water ≈ 1 mg/L.
  • Atmospheric CO₂ is about 420 ppm; safe drinking-water lead limit is 10 ppb (WHO).

Good to know

ppm by mass and ppm by volume differ for gases; check which the source means.

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Enjoy the little things in life. For one day, you may look back and realize they were the big things. Many of life's failures are people who did not realize how close they were to success when they gave up.

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