Decimal, percent, permille, ppm, ppb, ppt converter

           
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  Enter percent: %  
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  Enter ppm: ppm  
  Enter ppb: ppb  
  Enter ppt: ppt  
         
           

In science and engineering, the parts-per notation is a set of pseudo units to describe small values of miscellaneous dimensionless quantities, e.g. mole fraction or mass fraction. Since these fractions are quantity-per-quantity measures, they are pure numbers with no associated units of measurement. Commonly used are ppm (parts-per-million, 10–6), ppb (parts-per-billion, 10–9), ppt (parts-per-trillion, 10–12) and ppq (parts-per-quadrillion, 10-15).

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