Lab tools
Water Treatment Tools & Calculators
Four free tools, zero email walls. Each one shows its formula on screen and names the source of every number, the same rule our reviews follow: sizing, 10-year cost, system matching and water hardness.
What size water softener do you need?
People x 75 gallons x hardness x 7 days, computed live with the iron correction applied. Get your grain capacity, 32,000 to 80,000, with the math shown.
Size your softenerWhat will your system really cost over 10 years?
Equipment, installation and consumables by purchase tier, in dated ranges from Angi, HomeGuide and manufacturer prices checked Aug 28, 2026. No fake precision.
Estimate your costWhich system fits your home?
Seven questions a good plumber would ask first: water source, problem, bathrooms, budget. One honest recommendation, with the reasoning shown.
Take the 60-second quizHow hard is your water?
What gpg and ppm mean, per USGS classification, how to read your city's water quality report, and where your area likely sits on the hardness map.
Check your hardnessWhy Do These Tools Show Their Math?
Because the water treatment industry mostly does the opposite. Dealer quotes bundle equipment, labor and margin into one number that routinely lands between $5,000 and $10,000, and sizing advice usually arrives from the person selling the tank. Every tool here works from the same rules as our articles: formulas stated in plain English, industry conventions labeled as conventions, and every dollar figure a dated range with its source named, never a false-precision estimate. Start with the water softeners hub if you want the background first, or the best water softeners ranking once you know your size and budget.