Water Hardness GPG to PPM Calculator
Convert gpg, ppm and °dH.
All Plumbing & Water calculators
Water Heater Repair vs Replace Calculator
Repair the water heater or replace?
Water Softener Regeneration Calculator
How often it regenerates.
Water Softener Size Calculator
Find the right grain capacity.
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Water treatment and hot water, explained
Hard water and water heaters are linked: scale shortens heater life, and softeners are sized from hardness and household use. These tools use the same hardness and capacity formulas water treatment dealers use, and show them.
Softening treats hardness only; it is not a drinking water safety assessment. Gas and electrical work on water heaters should be done by a licensed plumber.
Frequently asked questions
What water hardness unit should I use?
Most U.S. softeners use grains per gallon (gpg). Divide ppm or mg/L by 17.1 to convert, or use the hardness converter.
Does a softener make water safe to drink?
No. It removes hardness minerals only. Have your water tested and follow local health guidance for other contaminants.
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