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Use the water softener sizing calculator below to determine your Grain Capacity:

Water Softener Sizing Calculator

Enter Your Information and Click Calculate

Round up where applicable.
Note: If hardness is measured in MG/L or PPM divide it by 17.1 to convert to GPG.


What do your results mean?

Note: Calculations are based upon your softener regenerating on an average of every seven days.

If Your Daily Grain Requirements Are: You Need a Water Softener With:
0 - 3,500 Grains Per Day 24,000 Grain Capacity
3,501 - 4,500 Grains Per Day 32,000 Grain Capacity
4,501 - 5,750 Grains Per Day 40,000 Grain Capacity
5,751 - 6,850 Grains Per Day 48,000 Grain Capacity
6,851 - 9,150 Grains Per Day 64,000 Grain Capacity
9,151 - 11,500 Grains Per Day 80,000 Grain Capacity
11,501 - 13,700 Grains Per Day 96,000 Grain Capacity
13,701 - 15,700 Grains Per Day 110,000 Grain Capacity

Learn More

Now You Know the Water Softener Size, Next Step is Picking the Valve Size. >
Click Here to Find Your Water Hardness. >
Water Softener FAQ's >
How Does a Water Softener Work >

If you know your water softener size and valve, click below to buy your softener:

Metered On Demand Water Softeners:
Twin Tank Metered Alternating Water Softeners:
Salt-Saving, Water-Saving Softeners:
  • Fleck 5600 w/High Efficiency
  • SoftPro Elite
Salt Free Water Softeners:
  • FilterSorb SP
Time Clock Water Softeners:
GE Autotrol Metered On Demand Water Softeners: