Free tool
Drink-mix concentration calculator
Too concentrated and your drink sits in your stomach. Check your mix against the 6–8% window.
The during-race sweet spot is 6–8 g of carbohydrate per 100 mL.
Your concentration
8.0%
In the sweet spot
Inside the 6–8% window — absorbs well and empties the stomach at a race-friendly rate.
Racing on an on-course drink?
Build my plan →CarbRate knows what each race serves and splits your carbs between the bottle and your gels automatically.
Get the split done for you
CarbRate figures out how much carbohydrate to put in the bottle vs. your gels, for your fluid rate and the heat.