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Free Hydration and Water Tools
These six free tools answer common water questions: how much to drink, what hydrogen ppb means, what is in your tap water, when to change a filter, how much a reusable bottle saves, and how to track daily intake. Each tool runs in your browser, needs no sign-up, and lists its sources.
- Daily Water Intake CalculatorAdequate daily water by age and life stage, in liters, ounces and bottles.
- Hydrogen Water PPB to PPM ConverterConvert ppb, ppm, mg/L and millimolar for dissolved hydrogen.
- Tap Water Quality Report LookupOpen your EWG and EPA water reports by ZIP and compare a value with EPA limits.
- Water Filter Replacement CalculatorTurn a filter's gallon rating and your daily use into a replacement date and calendar reminder.
- Reusable Bottle vs Plastic Bottle Savings CalculatorBottles avoided, money saved and break-even time for a reusable bottle.
- Printable Hydration TrackerA weekly water log with one circle per bottle. Print it or save as PDF.
Frequently asked questions
Are these tools free?
Yes. Every tool is free, runs in your browser and needs no sign-up or email.
Do the tools store my data?
No. Calculations happen on your device. Nothing you type is sent to Dr. Water.
Where do the numbers come from?
Each tool page lists its sources, such as the US National Academies, the US EPA and NIST. Where no published number exists, the tool asks you for yours.
Is this medical advice?
No. The tools show published reference data and simple arithmetic. Ask a health professional about your own needs.
Reference information only. Not medical advice. Last reviewed 2026-10-30.
