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Concentration

ppmtofrac

Convert parts per million (10⁻⁶) (ppm) to fractions (dimensionless ratio) (frac).

Factor1 ppm = 1e-6 frac

Converter

ppm

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

Result
1frac

Rendered to 6 significant figures.

Formula

Formula
frac = ppm × 1e-6

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

Worked example

Convert 1.00000e+6 ppm to frac.

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

Conversion table

ppmfrac
11e-6
22e-6
55e-6
101e-5
202e-5
505e-5
1001e-4
2000.0002
5000.0005
10000.001

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from ppm to frac?
1 ppm equals 1e-6 frac. To convert, multiply the value in parts per million (10⁻⁶) by 1e-6.
How do I convert 1 ppm to frac?
1 ppm = 1e-6 frac. For any value, multiply by 1e-6.
How do I convert frac back to ppm?
Divide by the same factor — or equivalently, multiply by 1000000. So 1 frac = 1.00000e+6 ppm.
When would I need to convert parts per million (10⁻⁶) to fraction (dimensionless ratio)?
Concentration-ratio conversions between ppm 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 ppm 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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