Water Treatment Calculator
Calculate purification tablets, drops or filter passes needed based on water volume and treatment method.
Total water volume to treat
Choose your water purification method
Clarity of your water source
Number of days on your trip
Litres of drinking water per person per day
How We Calculate This
Treatment Calculations
Tablets: 1 tablet per litre for clear water, doubled for cloudy. Wait 30 minutes (doubled for cloudy).
Drops: 2 drops per 0.75L for clear water. Wait 30 minutes.
Filter: 1 pass per litre. Instant results.
UV: 1 treatment per litre at 90 seconds.
Boiling: Rolling boil for 1 minute (3 minutes above 2000m).
Frequently Asked Questions
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Last updated: March 2026
All calculations are estimates. Always verify conditions and use proper safety equipment outdoors.