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Concentration

ppttofrac

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

Factor1 ppt = 1e-12 frac

Converter

ppt

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

Result
1frac

Rendered to 6 significant figures.

Formula

Formula
frac = ppt × 1e-12

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

Worked example

Convert 1e+12 ppt to frac.

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

Conversion table

pptfrac
11e-12
22e-12
55e-12
101e-11
202e-11
505e-11
1001e-10
2002e-10
5005e-10
10001e-9

Reference values rounded to 5 significant figures for display.

FAQ

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

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