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Hard Water Calculator
Hard water makes detergent less effective. Find out if you need more, plus whether a water softener would help.
Water hardness
Not sure? Check your local water utility's annual report — or buy a $5 hardness test strip.
Detergent type
Your water
Moderately Hard
100 ppm
Recommended detergent dose
70 mL
That's +10 mL more than the standard 60 mL dose.
Slightly more detergent or a small dose of borax helps lift stains. A whole-house softener isn't necessary.
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Hard water tips: Read about removing hard water stains from shower glass, faucets, and the best hard water cleaners we've tested.