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Concentration

ppttoppb

Convert parts per trillion (10⁻¹²) (ppt) to parts per billion (10⁻⁹) (ppb).

Factor1 ppt = 0.001 ppb

Converter

ppt

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

Result
1ppb

Rendered to 6 significant figures.

Formula

Formula
ppb = ppt × 0.001

Multiply any value in parts per trillion (10⁻¹²) by 0.001 to obtain the value in parts per billion (10⁻⁹).

Worked example

Convert 1000 ppt to ppb.

  1. 01Start with 1000 ppt.
  2. 02Multiply by the conversion factor: 1000 × 0.001 = 1 ppb.
Result1000 ppt = 1 ppb

Conversion table

pptppb
10.001
20.002
50.005
100.01
200.02
500.05
1000.1
2000.2
5000.5
10001

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from ppt to ppb?
1 ppt equals 0.001 ppb. To convert, multiply the value in parts per trillion (10⁻¹²) by 0.001.
How do I convert 1 ppt to ppb?
1 ppt = 0.001 ppb. For any value, multiply by 0.001.
How do I convert ppb back to ppt?
Divide by the same factor — or equivalently, multiply by 1000. So 1 ppb = 1000 ppt.
When would I need to convert parts per trillion (10⁻¹²) to parts per billion (10⁻⁹)?
Concentration-ratio conversions between ppt 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 ppt 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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