Does it count?
Does milk count as water?
Quick answer
Milk contributes to beverage intake. BHI research measured short-term urine output after 1 L in 72 healthy, hydrated men. It does not convert drinks into effective millilitres or show long-term health benefit. Milk retained more fluid in that experiment; alcohol is not a hydration strategy.
The short answer
Counts as a beverage
Counts as a beverage; short-term retention is a separate research measure.
BHI research measured short-term urine output after 1 L in 72 healthy, hydrated men. It does not convert drinks into effective millilitres or show long-term health benefit. Milk retained more fluid in that experiment; alcohol is not a hydration strategy.
| Serving | ml | The short answer |
|---|---|---|
| 1 glass (240 ml) | 240 ml | Counts as a beverage; short-term retention is a separate research measure. |
| 1 cup (240 ml) (Does coffee count as water) | 240 ml | Coffee hydrates about as well as water for habitual drinkers. |
| 1 mug (240 ml) (Does tea count as water) | 240 ml | Tea is nearly all water and hydrates well. |
| 1 can (355 ml) (Does soda count as water) | 355 ml | Counts as fluid, but the sugar makes it a poor hydrator. |
The bottom line
Count the volume you drink; do not add a BHI bonus. Choose a product that fits your nutritional needs and tolerances.
Whatever drinks you choose, the goal is the same: hit your total daily fluid target, mostly from water. Use the calculator to find that number for your body.
Find your daily water goal
Now you know what counts — see how much you actually need based on your weight, activity, and climate.
Frequently asked
Is milk more hydrating than water?
BHI research measured short-term urine output after 1 L in 72 healthy, hydrated men. It does not convert drinks into effective millilitres or show long-term health benefit. Milk retained more fluid in that experiment; alcohol is not a hydration strategy.
Does plant milk hydrate you the same way?
Plant-based drinks contribute fluid, but their ingredients and fortification vary. The cited dairy-milk trial does not establish a hydration ranking for all plant-based products. Check the product label.
Should I count milk toward my water goal?
Yes, you can count it. A glass of milk is roughly 210 ml of water. If you drink several glasses a day, they genuinely add up — just remember milk also brings calories and protein, unlike plain water.
Sources
- 1.Maughan et al., Beverage Hydration Index, AJCN 2016 — A controlled short-term study in 72 healthy, hydrated men compared urine output after 1 L of different drinks. Milk and ORS showed greater short-term retention; BHI is not a conversion to effective beverage volume or proof of long-term benefit.AJCN 103(3):717–723; abstract, methods and results (2-hour BHI and 4-hour cumulative urine)
- 2.U.S. National Academies (IOM/NAM), 2005 — Adequate total water intake of about 3.7 L/day for men and 2.7 L/day for women, including water from food and all beverages.Dietary Reference Intakes for Water, Potassium, Sodium, Chloride, and Sulfate, Summary: water adequate intakes; drinks and food