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Concentration

%toppt

Convert percent (10⁻²) (%) to parts per trillion (10⁻¹²) (ppt).

Factor1 % = 1e+10 ppt

Converter

%

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

Result
1e+10ppt

Rendered to 6 significant figures.

Formula

Formula
ppt = % × 1e+10

Multiply any value in percent (10⁻²) by 1e+10 to obtain the value in parts per trillion (10⁻¹²).

Worked example

Convert 1 % to ppt.

  1. 01Start with 1 %.
  2. 02Multiply by the conversion factor: 1 × 1e+10 = 1e+10 ppt.
Result1 % = 1e+10 ppt

Conversion table

%ppt
11e+10
22e+10
55e+10
101e+11
202e+11
505e+11
1001e+12
2002e+12
5005e+12
10001e+13

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from % to ppt?
1 % equals 1e+10 ppt. To convert, multiply the value in percent (10⁻²) by 1e+10.
How do I convert 1 % to ppt?
1 % = 1e+10 ppt. For any value, multiply by 1e+10.
How do I convert ppt back to %?
Divide by the same factor — or equivalently, multiply by 1e-10. So 1 ppt = 1e-10 %.
When would I need to convert percent (10⁻²) to parts per trillion (10⁻¹²)?
Concentration-ratio conversions between % 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 % 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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