Water Softener Sizing Calculator

Size a water softener for your household based on water hardness, iron content, and daily usage. Compare softener capacities to find the right fit with salt usage and cost estimates.

Number of People

Water Hardness (GPG)

Daily Usage / Person (gal)

Iron Content (PPM)

Regen Frequency (days)

Pricing (edit to match local rates)

24K Grain ($)

32K Grain ($)

48K Grain ($)

64K Grain ($)

80K Grain ($)

Salt Cost ($/lb)

Daily Hardness Removal

3,200 grains

Per day demand

Capacity Needed

22,400 grains

Per 7-day cycle

Recommended Size

24K Grain

$500.00

Softener Size	Capacity Headroom	Unit Price
24K GrainBest value	+7% headroom	$500.00
32K Grain	+43% headroom	$650.00
48K Grain	+114% headroom	$900.00
64K Grain	+186% headroom	$1,200.00
80K Grain	+257% headroom	$1,500.00

Recommended: 24K Grain SoftenerBased on your household of 4 people with 10 GPG hardness, you need 22,400 grains of capacity per regeneration cycle. The 24K Grain softener handles this with 7% headroom at a unit cost of $500.00. Estimated salt usage is 13.4 lbs per regeneration, costing about $8.64/month.

These are estimates based on typical residential water softener performance. Actual capacity, salt usage, and pricing vary by manufacturer and model. Consult a water treatment professional for site-specific recommendations.