How much water do you actually need?

Forget the rigid "8 glasses" rule. Practical daily targets are roughly 2.7 liters for women and 3.7 liters for men in total fluids (food included), adjusted for heat, exercise and body size. Easy self-checks: pale-yellow urine and rarely feeling thirsty mean you're in range.

Hydration matters more during weight loss than people think: mild dehydration reads as fatigue and hunger, and drinking water before meals modestly reduces how much you eat.

Why water tracking usually fails

Because it lives in a separate app you stop opening by week two. The fix is the same as with food logging: make it a two-second action in the app you already open at every meal.

Track water in Calories AI Calculator

  1. Open the Health tab.
  2. Set your daily goal with the slider (e.g. 2,500 ml).
  3. Every time you drink, tap +250 or +500 — the progress bar fills toward your goal. Mis-tap? Hit Undo.
  4. Since you're already in the app to log meals, hydration piggybacks on the habit you've already built.
💡 Habit stack it: log a glass of water every time you log a meal. Three meals plus a bottle at your desk gets most people to goal without thinking about it.

Water, weight and calories in one view

The Health tab keeps water, weight and daily notes together: your hydration bar sits directly above your weight trend graph, and your calorie ring is one tab away. One glance answers "how is today actually going?" — which is the whole point of tracking anything.

Signals you're under-hydrated

Two weeks of logged data usually reveals the pattern: the low-water days and the over-budget snacking days are the same days.

Water tracker showing 1,250 of 2,500 ml with one-tap +250 and +500 buttons above a weight graph
One-tap hydration logging with your daily goal, right above the weight trend.

Try It on Your Next Meal — Free

Download Calories AI Calculator on the App Store, snap your next plate, and get calories and macros before you've picked up the fork.

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