Does coffee count toward daily water intake?
Short answer: Mostly yes. For regular coffee drinkers, a cup of coffee still leaves you with most of its water; the mild diuretic effect of caffeine does not cancel it out. A fair way to count it is at about 80%, and tea at about 90%.
The old myth: "coffee dehydrates you"
Caffeine does increase urine output a little, especially in people who rarely drink it. But the water in the cup is larger than what the caffeine makes you lose, so coffee adds to your hydration rather than subtracting from it.
Why not count it at 100%?
Counting every latte as plain water can make your tracker say "goal reached" while you drank little actual water. A hydration factor is a simple compromise that keeps totals realistic.
| Drink | Counted as | 250 ml counts |
|---|---|---|
| Water | 100% | 250 ml |
| Tea, milk, juice, soda | 90% | 225 ml |
| Coffee | 80% | 200 ml |
Alcohol is different: it does increase fluid loss, so do not count beer or wine toward your goal.
In Gulply
Pick water, tea, coffee, juice, milk or soda when you log. With hydration factors on (the default), coffee counts 80% and the others 90%, and the factor is shown next to each entry. Prefer to count everything at 100%? Turn factors off in Settings.