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Water Softener Size Calculator

Need to find out the size or capacity of a water softener for your home? Use the calculator below and get a rough idea on the grain capacity required to sufficiently soften your water.

Select the number of people that live in your home. By default, the average water usage per person is set at a conservative 50 gallons per day. If you think your daily water usage is higher, set a higher value.


If you don’t know your water hardness, check the box below and have the calculator roughly estimate your water hardness for your city.

I don't know my water hardness.
# of People Water Usage per Person Water Hardness
Water Softener Size in Grains Capacity: