Whole Home Water GuideWater treatment tool
RO System Cost Calculator
Estimate total cost of ownership and cost per year for a reverse osmosis system from upfront price, annual filter cost, and years owned.
Screening estimate only.Confirm results with a certified water test and a water treatment professional before you buy or size equipment.
Screening result
- Total cost of ownership
- Cost per year
Fine Print and Sources
Screening estimate only. These tools use only the values you enter and simple planning math. A certified water test and a water treatment professional are authoritative for final sizing, salt settings, and purchase decisions.
Total cost of ownership equals upfront cost plus annual filter and membrane cost times years owned. Cost per year divides that total by years owned. Real costs vary. Get quotes and check filter schedules for your specific system.
- USGS Water Science School, hardness of water: gives the water hardness classification bands used here in milligrams per liter as calcium carbonate.