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Concentration

%toppb

Convert percent (10⁻²) (%) to parts per billion (10⁻⁹) (ppb).

Factor1 % = 1e+7 ppb

Converter

%

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

Result
1e+7ppb

Rendered to 6 significant figures.

Formula

Formula
ppb = % × 1e+7

Multiply any value in percent (10⁻²) by 1e+7 to obtain the value in parts per billion (10⁻⁹).

Worked example

Convert 1 % to ppb.

  1. 01Start with 1 %.
  2. 02Multiply by the conversion factor: 1 × 1e+7 = 1e+7 ppb.
Result1 % = 1e+7 ppb

Conversion table

%ppb
11e+7
22e+7
55e+7
101e+8
202e+8
505e+8
1001e+9
2002e+9
5005e+9
10001e+10

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from % to ppb?
1 % equals 1e+7 ppb. To convert, multiply the value in percent (10⁻²) by 1e+7.
How do I convert 1 % to ppb?
1 % = 1e+7 ppb. For any value, multiply by 1e+7.
How do I convert ppb back to %?
Divide by the same factor — or equivalently, multiply by 1e-7. So 1 ppb = 1e-7 %.
When would I need to convert percent (10⁻²) to parts per billion (10⁻⁹)?
Concentration-ratio conversions between % and ppb 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 ppb are defined by exact SI relationships, so the displayed factor is exact (any rounding shown is only for display).

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