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Formula for Calculating GPG and Grain Capacity

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.
X X { + }
              If City Water, Enter 0 for Iron    

Total Grains Per Day That Must Be Removed:
  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:
Pro - Soft 1
SoftPro CS1 EE
SoftPro CS1.25
Fleck 2510 Econominder
Fleck 2510STX
Fleck 5600 Econominder
Fleck 5600SXT
Fleck 7000SXT

Twin Tank Metered Alternating Water Softeners:
Twin Demand 9000
Twin Demand 9100SXT

Salt-Saving, Water-Saving Softeners:
Fleck 5600 w/Vortech
Go Green Fleck 2510SXT

Salt Free Water Softeners:
FilterSorb SP

Time Clock Water Softeners:
Fleck 5600 Time Clock
Fleck 2510 Time Clock

GE Autotrol Metered On Demand Water Softeners:
Autotrol 255/ 460i


This GPG calculator was developed by Clay Butler and Rob Chevalier and is Copyright 2006 Quality Water Treatment


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How to Size Your Water Softener - Find the Best Water Softener for Your Needs - Calculating GPG and Grain Capacity - Water Softener Size Guide