Category · 20 conversions

Concentration Conversions

Dimensionless-ratio concentration conversions for trace-analysis, gas-composition and process-chemistry work: fraction, percent, parts per million (ppm), parts per billion (ppb) and parts per trillion (ppt, 10⁻¹²). These conversions 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 and are not deterministic.

Index · 20

All Conversions

frac → %
fraction (dimensionless ratio) to percent (10⁻²)
% → frac
percent (10⁻²) to fraction (dimensionless ratio)
frac → ppm
fraction (dimensionless ratio) to parts per million (10⁻⁶)
ppm → frac
parts per million (10⁻⁶) to fraction (dimensionless ratio)
frac → ppb
fraction (dimensionless ratio) to parts per billion (10⁻⁹)
ppb → frac
parts per billion (10⁻⁹) to fraction (dimensionless ratio)
frac → ppt
fraction (dimensionless ratio) to parts per trillion (10⁻¹²)
ppt → frac
parts per trillion (10⁻¹²) to fraction (dimensionless ratio)
% → ppm
percent (10⁻²) to parts per million (10⁻⁶)
ppm → %
parts per million (10⁻⁶) to percent (10⁻²)
% → ppb
percent (10⁻²) to parts per billion (10⁻⁹)
ppb → %
parts per billion (10⁻⁹) to percent (10⁻²)
% → ppt
percent (10⁻²) to parts per trillion (10⁻¹²)
ppt → %
parts per trillion (10⁻¹²) to percent (10⁻²)
ppm → ppb
parts per million (10⁻⁶) to parts per billion (10⁻⁹)
ppb → ppm
parts per billion (10⁻⁹) to parts per million (10⁻⁶)
ppm → ppt
parts per million (10⁻⁶) to parts per trillion (10⁻¹²)
ppt → ppm
parts per trillion (10⁻¹²) to parts per million (10⁻⁶)
ppb → ppt
parts per billion (10⁻⁹) to parts per trillion (10⁻¹²)
ppt → ppb
parts per trillion (10⁻¹²) to parts per billion (10⁻⁹)