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Calcimator

Water Softener Sizing Calculator

Size a water softener based on water hardness, iron content, household usage, and regeneration frequency.

Inputs

GPG
PPM
gallons
days

Results

Recommended Softener Size

40,000 grains

Monthly Salt Cost

$10.43

Required Grain Capacity36,750 grains
Salt per Regeneration16 lbs
Annual Salt Usage834 lbs
How to Use This Calculator
  1. Enter your water hardness in grains per gallon (GPG) from a water test kit or report.
  2. Enter iron content in PPM — iron adds to the effective hardness demand.
  3. Set your daily water usage in gallons or enter the number of household members.
  4. Set the regeneration interval in days — 7 days is a common starting point.
  5. Review Required Grain Capacity and Recommended Softener Size to shop for the right unit.
  6. Use Annual Salt Usage and Monthly Salt Cost to estimate ongoing operating expense.
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