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APS TechNotes See all articles

Useful Water Purification Calculations

  • 1 gallon of water is approximately 8.33 pounds
  • 1 gallon = 231 cubic inches
  • 1 gallon = 3.785 Liters
  • 1 gallon = 3785 Mililiters
  • 1 cubic foot of water weighs approximately 62.4 lbs.
  • 1 cubic foot = 7.48 gallons  
  • 1 pound = 7000 grains
  • 1 pound = 453.6 grams
  • 1 gram = 15.43 grains
  • 1 gram per liter = 58.41 grains per gallon
  • 1 gram per liter = 1000 p.p.m.
  • 0.0171 grams per liter = 1 grain per gallon
  • 0.0038 grams per gallon = 1 part per million
  • 1 grain per gallon = 17.1 parts per million
  • 1 grain per gallon = 142.9 pounds per million gallons
  • 1 miligram per liter = 1 part part per million
  • 1 part per million = 0.058 grains per gallon
  • 8.33 pounds / 1,000,000 gallons = 1 part per million
  • 10,000 parts per million = 1%

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