Yes. Coffee, tea, milk, and most everyday drinks hydrate you nearly as well as water. A drink's hydration value is the share of its volume that counts toward your daily goal: in Waterie, a 250 ml coffee counts as about 240 ml. Here is the value the app uses for every built-in drink.
Yes. In the Beverage Hydration Index study, coffee hydrated about as well as water, and regular coffee drinkers adapt to caffeine's mild diuretic effect. Waterie counts coffee at 95%, so a 250 ml cup adds about 240 ml to your goal. Espresso counts slightly less, at 90%.
Yes. Black, green, and herbal tea all count at 95%. Sweeter, heavier drinks count a little less: Thai tea at 90% and boba tea at 85%.
In the Beverage Hydration Index study, milk kept people hydrated longer than water, thanks to its protein, fat, and electrolytes. Waterie caps every drink at 100%, so milk, plant milks, and yogurt drinks count the same as water.
Yes, mostly. Cola hydrated about as well as water in the study. Waterie counts soda, cola, and diet soda at 90%.
Only partly. Alcohol makes you pass more urine, and the stronger the drink, the bigger the effect. Waterie counts beer at 60%, wine at 50%, cocktails at 40%, and spirits at 20%. Water alongside is still the better idea.
Yes, fully. Sports drinks, electrolyte water, and coconut water count at 100%, the same as water. Energy drinks and pre-workout drinks count at 85%.
The share of each drink that counts toward your goal in the Waterie app, and what a 250 ml serving adds.
| Drink | Hydration value | 250 ml counts as |
|---|---|---|
| Water | 100% | 250 ml |
| Sparkling Water | 100% | 250 ml |
| Mineral Water | 100% | 250 ml |
| Flavored Water | 100% | 250 ml |
| Coconut Water | 100% | 250 ml |
| Vitamin Water | 100% | 250 ml |
| Iced Coffee | 95% | 238 ml |
| Iced Tea | 95% | 238 ml |
| Cold Brew | 95% | 238 ml |
| Es Yen | 95% | 238 ml |
| Oliang | 95% | 238 ml |
| Thai Lemon Tea | 95% | 238 ml |
| Pink Milk | 95% | 238 ml |
| Thai Herbal Drink | 95% | 238 ml |
| Thai Tea | 90% | 225 ml |
| Lemonade | 90% | 225 ml |
| Soda | 90% | 225 ml |
| Diet Soda | 90% | 225 ml |
| Cola | 90% | 225 ml |
| Thai Green Milk Tea | 90% | 225 ml |
| Sweet Tea | 90% | 225 ml |
| Slushie | 90% | 225 ml |
| Boba Tea | 85% | 213 ml |
| Drink | Hydration value | 250 ml counts as |
|---|---|---|
| Latte | 97% | 243 ml |
| Flat White | 97% | 243 ml |
| Chai Latte | 97% | 243 ml |
| Matcha Latte | 97% | 243 ml |
| Coffee | 95% | 238 ml |
| Americano | 95% | 238 ml |
| Decaf Coffee | 95% | 238 ml |
| Cappuccino | 95% | 238 ml |
| Mocha | 95% | 238 ml |
| Tea | 95% | 238 ml |
| Green Tea | 95% | 238 ml |
| Black Tea | 95% | 238 ml |
| Herbal Tea | 95% | 238 ml |
| Matcha | 95% | 238 ml |
| Hot Chocolate | 95% | 238 ml |
| Espresso | 90% | 225 ml |
| Drink | Hydration value | 250 ml counts as |
|---|---|---|
| Milk | 100% | 250 ml |
| Plant Milk | 100% | 250 ml |
| Oat Milk | 100% | 250 ml |
| Soy Milk | 100% | 250 ml |
| Almond Milk | 100% | 250 ml |
| Coconut Milk | 100% | 250 ml |
| Chocolate Milk | 100% | 250 ml |
| Yogurt Drink | 100% | 250 ml |
| Caramel Milk | 95% | 238 ml |
| Drink | Hydration value | 250 ml counts as |
|---|---|---|
| Juice | 95% | 238 ml |
| Apple Juice | 95% | 238 ml |
| Cranberry Juice | 95% | 238 ml |
| Orange Juice | 95% | 238 ml |
| Pineapple Juice | 95% | 238 ml |
| Grape Juice | 95% | 238 ml |
| Mango Juice | 95% | 238 ml |
| Pomegranate Juice | 95% | 238 ml |
| Smoothie | 90% | 225 ml |
| Protein Shake | 90% | 225 ml |
| Drink | Hydration value | 250 ml counts as |
|---|---|---|
| Sports Drink | 100% | 250 ml |
| Electrolyte Water | 100% | 250 ml |
| Energy Drink | 85% | 213 ml |
| Pre-Workout | 85% | 213 ml |
| Drink | Hydration value | 250 ml counts as |
|---|---|---|
| Beer | 60% | 150 ml |
| Wine | 50% | 125 ml |
| Cocktail | 40% | 100 ml |
| Spirits | 20% | 50 ml |
| Drink | Hydration value | 250 ml counts as |
|---|---|---|
| Kombucha | 95% | 238 ml |
Waterie's values start from the Beverage Hydration Index, a 2016 study by Maughan and colleagues in the American Journal of Clinical Nutrition. It compared how much urine people produced in the four hours after drinking one litre of 13 common drinks, including coffee, tea, cola, milk, orange juice, and lager, against the same amount of water.
Drinks outside the study are given values by drink type. Waterie caps every value at 100%, so no drink counts for more than its volume, and it counts alcohol and heavier, sweeter drinks more conservatively than the study's short-term results.
These are the values the app uses today, and they are a practical guide for everyday tracking, not medical advice. If you have a condition that affects your fluid balance, follow your doctor's advice.
Log any drink in Waterie and it counts toward your goal with its hydration value automatically. Your buddy has opinions about your choices, too.
