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Concentration

ppmtoppb

Convert parts per million (10⁻⁶) (ppm) to parts per billion (10⁻⁹) (ppb).

Factor1 ppm = 1000 ppb

Converter

ppm

Accepts numbers or expressions, e.g. 150 + 14.7

Result
1000ppb

Rendered to 6 significant figures.

Formula

Formula
ppb = ppm × 1000

Multiply any value in parts per million (10⁻⁶) by 1000 to obtain the value in parts per billion (10⁻⁹).

Worked example

Convert 1 ppm to ppb.

  1. 01Start with 1 ppm.
  2. 02Multiply by the conversion factor: 1 × 1000 = 1000 ppb.
Result1 ppm = 1000 ppb

Conversion table

ppmppb
11000
22000
55000
1010000
2020000
5050000
1001.0000e+5
2002.0000e+5
5005.0000e+5
10001.0000e+6

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from ppm to ppb?
1 ppm equals 1000 ppb. To convert, multiply the value in parts per million (10⁻⁶) by 1000.
How do I convert 1 ppm to ppb?
1 ppm = 1000 ppb. For any value, multiply by 1000.
How do I convert ppb back to ppm?
Divide by the same factor — or equivalently, multiply by 0.001. So 1 ppb = 0.001 ppm.
When would I need to convert parts per million (10⁻⁶) to parts per billion (10⁻⁹)?
Concentration-ratio conversions between ppm and ppb are used in trace-analysis, gas-composition work, environmental reporting and process-chemistry datasheets. These conversions are dimensionless: they do NOT cover mg/L, g/L, mol/L, normality, equivalents, mass-percent, volume-percent, ppmw or ppmv — those require solution density and/or molecular weight. Note: ppt here means parts per trillion (10⁻¹²), not parts per thousand.
Is the conversion exact?
Yes. Both ppm and ppb are defined by exact SI relationships, so the displayed factor is exact (any rounding shown is only for display).

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