Whole Home Water GuideWater treatment tool
Water Softener Sizing Calculator
Estimate daily grain load and a recommended softener grain capacity from household size and water hardness before a professional water test.
Screening estimate only.Confirm results with a certified water test and a water treatment professional before you buy or size equipment.
Screening result
Fine Print and Sources
Screening estimate only. These tools use only the values you enter and simple planning math. A certified water test and a water treatment professional are authoritative for final sizing, salt settings, and purchase decisions.
Daily grains equal people times gallons per person times hardness in gpg. Recommended capacity between regenerations is daily grains times 7 for a weekly cycle, rounded up to a standard cabinet size. This is a sizing estimate. Confirm with a water test and a pro.
- USGS Water Science School, hardness of water: gives the water hardness classification bands used here in milligrams per liter as calcium carbonate.