PPM Calculator

Your details

Forward mode computes concentration from masses. Reverse mode tells you how much solute to add. Dilution mode finds how much solvent to add to dilute a concentrated solution.
The mass of the dissolved substance (the part you are measuring). Select the unit that matches your measurement.
The total mass of the whole solution (solute plus solvent). Keep the unit consistent with the solute mass, or let the unit selector handle the conversion.
Concentration (ppm)Dilute
50ppm
Parts per billion50,000ppb
Parts per trillion50,000,000ppt
Approx. mg/L (dilute water)50mg/L
Percentage by mass0.005%
50 ppm
Trace<1Dilute1-1000Concentrated1000-10000Very concentrated10000+

50 ppm = 50,000 ppb = 0.005% by mass.

  • One ppm means one milligram of solute per kilogram of solution. For dilute water solutions (density near 1 kg/L), 1 ppm is also approximately 1 mg/L.
  • Here 0.05 g of solute sits in 1,000 g of solution, one part in 20,000.
  • Dilute concentrations like this are typical for fluoride in tap water (0.7 ppm target), chlorine in pools (1-3 ppm), and dissolved CO2 in beverages.
  • 50 ppm converts to 50,000 ppb and 50,000,000 ppt.

Next stepSwitch to reverse mode to calculate how many grams of solute you need to hit a specific ppm target, or use dilution mode to lower a concentrated solution.

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