💧 Filtered Water Beta

Same water,
without the case of bottles.

Tap water costs half a cent a gallon — the bottle is what you’re paying for. See what a filter saves against your bottled-water habit.

Beta Water is our newest calculator and still in beta — several equipment prices are cross-retailer estimates and may change as we verify them.

Your current habit

What you buy out now — the spending we compare against.

1 Your bottled-water habit

How many bottles a day or week? Tap Edit prices to match what you pay.

Filter cartridges are already counted per gallon above, so they are not repeated here.

Total ongoing upkeep $0/mo

Counted against your at-home cost for the whole projection.

Your at-home setup

The gear and ingredients you'd use to make it yourself.

From a faucet mount to a countertop RO unit — this sets the upfront cost.

Filter price (USD)

These are the refills that fit the filter you picked above — cartridge price spread over its rated gallons, plus about half a cent of tap water.

What your habit costs you —

Per month —

Filter pays for itself in —

            Net savings
            —
          

Break-even progress

Based on your habit — every filter eventually pays for itself.

100% ad-free — supported only by Amazon affiliate links. Never costs you extra.

A cheap TDS meter or test strip tells you what your tap actually needs — plus bottles to carry it and a fridge filter if that’s where you drink from.