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Concentration

ppttoppm

Convert parts per trillion (10⁻¹²) (ppt) to parts per million (10⁻⁶) (ppm).

Factor1 ppt = 1e-6 ppm

Converter

ppt

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

Result
1ppm

Rendered to 6 significant figures.

Formula

Formula
ppm = ppt × 1e-6

Multiply any value in parts per trillion (10⁻¹²) by 1e-6 to obtain the value in parts per million (10⁻⁶).

Worked example

Convert 1.00000e+6 ppt to ppm.

  1. 01Start with 1.00000e+6 ppt.
  2. 02Multiply by the conversion factor: 1.00000e+6 × 1e-6 = 1 ppm.
Result1.00000e+6 ppt = 1 ppm

Conversion table

pptppm
11e-6
22e-6
55e-6
101e-5
202e-5
505e-5
1000.0001
2000.0002
5000.0005
10000.001

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from ppt to ppm?
1 ppt equals 1e-6 ppm. To convert, multiply the value in parts per trillion (10⁻¹²) by 1e-6.
How do I convert 1 ppt to ppm?
1 ppt = 1e-6 ppm. For any value, multiply by 1e-6.
How do I convert ppm back to ppt?
Divide by the same factor — or equivalently, multiply by 1000000. So 1 ppm = 1.00000e+6 ppt.
When would I need to convert parts per trillion (10⁻¹²) to parts per million (10⁻⁶)?
Concentration-ratio conversions between ppt and ppm 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 ppm are defined by exact SI relationships, so the displayed factor is exact (any rounding shown is only for display).

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