Drinking water calculators

Compare filters, bottled water and reverse osmosis, and find which certifications matter for lead and PFAS.

• Which Filter Removes PFAS or Lead? Certification FinderFind which NSF/ANSI certification to look for when choosing a filter for lead, PFAS or both, by filter type. Based on EPA's consumer guidance.
• Water Filter vs Bottled Water Cost CalculatorCompare the cost per gallon of filtered tap water with bottled water and see your first-year savings and break-even point.
• Water Filter Cost per Gallon CalculatorWork out the true cost per gallon of a pitcher, faucet, under-sink or reverse osmosis filter, using whichever comes first: the gallon rating or the time limit.
• Reverse Osmosis Output & Waste Water CalculatorEstimate reverse osmosis production at your water pressure, waste water per day and year, recovery and TDS rejection rate.