Whole House Filtration Calculator
Size a whole-house water filtration system based on household size, flow demand, water hardness, iron levels, and water source.
Inputs
Results
Total system cost
$4,030
Peak flow demand (GPM)8
Filter rating needed (GPM)12
System pipe size (in.)0.75
Daily water usage (gal)320
Softener needed?1
Softener size (grains)24,000
Iron filter needed?1
UV disinfection needed?0
Equipment cost$3,230
Installation cost$800
Annual maintenance cost$204
Pressure drop (PSI)12
Monthly Usage (gal)9,600
Carbon Media Life Years9
How to Use This Calculator
- Enter your household size (people) and number of bathrooms to calculate peak flow demand.
- Select your water source: 0 = city/municipal water, 1 = private well (well water needs UV and iron treatment).
- Enter your water hardness in grains per gallon (GPG) from a water test — above 3 GPG warrants a softener.
- Enter iron content in PPM — above 0.3 PPM causes staining and taste issues requiring an iron filter.
- Review Softener Size, Iron Filter, and UV flags to determine which components your system needs.
- Use Total System Cost and Annual Maintenance Cost to plan your whole-house filtration budget.
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