The most useful way to think about water intake is not a fixed number like "2 liters". It is a range. A 55 kg person and a 95 kg person do not have the same needs, and a hot day changes the target again.
The simple formula
Example: a 70 kg adult starts at roughly 2.1 to 2.45 liters per day. On a warm day, with a walk, workout or poor sleep, the needed amount is higher.
What changes your daily target?
- Temperature and humidity
- Exercise, walking and outdoor work
- Sleep quality and overnight fluid loss
- Alcohol, fever or illness
- Your body size and how much you sweat
The best habit is simple: drink regularly during the day instead of waiting for thirst. Thirst is late. By the time you feel it, you are already behind.
Track the right amount with Brim
Brim helps you log intake fast, see progress clearly and keep hydration on track without manual spreadsheets.
Free on the App StoreFAQ
How much water should I drink daily?
Use 30 to 35 ml per kilogram as a starting point, then adjust for heat, sport and sweating.
Is one fixed number enough for everyone?
No. It is a rough average only. Personal needs move with temperature, activity and body size.
What is the easiest way to stay consistent?
A reminder plus a tracker usually works better than trying to remember everything manually.
More from JDL Software
CaffSense – Caffeine & Sleep · Then – Voice Time Capsule · All apps