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Full services directory How it worksFor prosAbout Get matched Call (866) 582-8523Sizing and cost calculators are useful for orienting yourself before a quote, not for making the final decision. A softener sizing tool needs two real inputs — your measured hardness and your household's daily water use — and both should come from a lab test and your water bill, not from estimates. The most accurate free tool available to you is your utility's Consumer Confidence Report, which EPA requires to be delivered annually by July 1.
Sizing calculators multiply hardness by daily household water use to get a daily grain load, then size capacity so the unit regenerates on a sensible interval. Garbage in, garbage out: if you guess your hardness, the tool will confidently size you into a unit that costs $600–$1,500 more than needed, since Fixr's materials pricing runs from roughly $400–$1,000 at 32,000 grains to $1,700–$2,500 at 96,000.
Cost calculators are best used as a sanity check against a live quote. Published 2026 ranges: salt-based softeners $1,200–$3,800 installed, whole-house carbon/mineral/sediment $850–$1,400, whole-house RO $4,800–$8,000, under-sink point-of-use $170–$580. A quote well outside those bands isn't proof of anything, but it is a question worth asking out loud.
Hardness lookup by ZIP is a convenience, not a measurement. Municipal hardness varies by source and by season, and a well two miles away tells you nothing reliable about yours. Use a lookup to get oriented, then confirm with a test — a basic professional hardness and water analysis is $130–$200.
Filtration selectors should output a standard, not a product. If a selector asks about your symptoms and returns "you need NSF/ANSI 53 certified reduction for lead" you can shop that anywhere. If it returns a single SKU from the company that built the tool, it's a lead form with a calculator on the front.
That is worth something only while you are still choosing. Tell us what is going on and we will match you with a few water treatment pros whose licence and insurance we have already checked — free, no obligation.
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