- Default serving250 mlSoft drink
- Counts toward goal250 mlhydration factor 1.00
- Caffeine80 mgper 250 ml serving
- Calories113 kcal45 kcal per 100 ml
Move the slider to see what a bigger or smaller energy drink does to the numbers. The app uses the same figures.
See when today's caffeine clears with the caffeine cutoff calculator.
The caffeine is the point, the sugar is the surprise
80 mg in 250 ml works out at 320 mg of caffeine per litre. That number matters because European labelling rules draw a line at 150 mg per litre. Any drink over it must carry the words "High caffeine content. Not recommended for children or pregnant or breast-feeding women." A standard energy drink sits at roughly twice that threshold, which is why the warning appears on almost every can.
The 500 ml cans that dominate fridge shelves are two servings, not one. Log one of those and the app charges you 160 mg. That is more caffeine than a 355 ml mug of drip coffee. A mid-afternoon can of that size is still measurably in your blood at bedtime. That is the number the "last chance for coffee" feature is built around. It works backwards from when you want to sleep and the half-life you picked. Then it tells you when the next dose stops being free.
Why it still counts as a full glass of water
The hydration factor is 1.00, so 250 ml of energy drink adds 250 ml toward the daily goal. Caffeine at these doses is not a meaningful diuretic. The Beverage Hydration Index trial measured urine output after a litre of each of thirteen drinks. The caffeinated ones (cola, tea, coffee) sat level with water. Nothing in the rest of the can changes that. Taurine, glucuronolactone and the B vitamins are there for the marketing story. None of them alters fluid balance.
What does change is everything you are drinking alongside the water. 113 calories per can is almost all sugar, roughly the same as an equal volume of cola. It arrives without any of the bulk that makes food feel like food. Sugar-free cans keep the caffeine and drop the calories. If that is what is in your hand, edit the calorie figure on the drink, and the app remembers it.
A practical way to use the numbers
Caffeine here scales with volume, not with cups. Half a can is 40 mg, a 500 ml can is 160 mg, a 355 ml can is 114 mg. Slide the serving control above to the size actually in front of you. Then decide whether it fits under your ceiling for the day. Most people who cut back do it by switching the second can for a smaller one rather than by giving the habit up.
Hydration factors follow the Beverage Hydration Index: Maughan RJ, Watson P, Cordery PA, et al. “A randomized trial to assess the potential of different beverages to affect hydration status: development of a beverage hydration index.” American Journal of Clinical Nutrition, 2016;103(3):717-723. Read the paper on PubMed. In WaterChamp an energy drink counts the same as plain water.
