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Concentration

fractoppt

Convert fractions (dimensionless ratio) (frac) to parts per trillion (10⁻¹²) (ppt).

Factor1 frac = 1e+12 ppt

Converter

frac

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

Result
1000ppt

Rendered to 6 significant figures.

Formula

Formula
ppt = frac × 1e+12

Multiply any value in fractions (dimensionless ratio) by 1e+12 to obtain the value in parts per trillion (10⁻¹²).

Worked example

Convert 1e-9 frac to ppt.

  1. 01Start with 1e-9 frac.
  2. 02Multiply by the conversion factor: 1e-9 × 1e+12 = 1000 ppt.
Result1e-9 frac = 1000 ppt

Conversion table

fracppt
11e+12
22e+12
55e+12
101e+13
202e+13
505e+13
1001e+14
2002e+14
5005e+14
10001e+15

Reference values rounded to 5 significant figures for display.

FAQ

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

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