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PPM to PPB Converter

Convert parts per million (ppm) to parts per billion (ppb). Simple chemistry conversion with instant results.

What this tool does

Convert parts per million (ppm) to parts per billion (ppb). Simple chemistry conversion with instant results. Type an amount in parts per million, choose the units, and the tool converts it to parts per billion (10⁻⁹). It offers 7 ratio (parts per) units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one: Fraction (the number 1), Percent, Per mille (part per thousand), Part per million, Part per billion (10⁻⁹), Part per trillion (10⁻¹²), Part per quadrillion (10⁻¹⁵). Starts as Part per million.
  • To: Choose one of the same 7 units as "From". Starts as Part per billion (10⁻⁹).

How to use

  1. Enter the amount you want to convert.
  2. Choose the unit to convert from and the unit to convert to.
  3. Read the result: the converted amount and the same amount in the other units. It appears once every required field has a valid value.

Worked examples

Conversions from parts per million to parts per billion (10⁻⁹):

  • 1 ppm = 1,000 ppb
  • 5 ppm = 5,000 ppb
  • 10 ppm = 10,000 ppb
  • 50 ppm = 50,000 ppb
  • 100 ppm = 100,000 ppb

Multiply the number of parts per million by 1,000 to get parts per billion (10⁻⁹). Both units are exact definitions, so 1,000 is the exact factor: 1 ppm = 1,000 ppb.

Sources: Part per million: SI Brochure, 9th edition (2019), section 5.4.7. Part per billion (10⁻⁹): NIST SP 811 (2008), section 7.10.3.

Limitations

  • Converts the unit of a dimensionless ratio only. It does not convert mass per volume (such as mg/L) to ppm, which depends on the solution.
  • Parts per billion uses the short-scale billion, 10⁹, and parts per trillion uses 10¹². Where the long scale is used, a billion can mean 10¹², so check which one a source means.

FAQs

Q: How do I convert ppm to ppb?
A: Multiply by 1,000. One ppm is 1,000 ppb.
Q: How do I convert ppb to ppm?
A: Divide by 1,000. Swap the From and To units.
Q: Can I go further down to ppt?
A: Yes. The grid also shows parts per trillion and parts per quadrillion.

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