Homemade gel · electrolyte mix · flavor reference

Fuel Calculator

For the research and reasoning behind these numbers, see Fueling the Run.

Duration
hr : min
Carb target
g / hr
Flask size
ml
total carbs
sodium target
potassium target
Maltodextrin
Fructose
Pectin optional
thickens the mixture — omit for a thinner consistency
Water
Maltodextrin (2 parts) Fructose (1 part)
Gel volume
Flasks needed
Liters to prepare
~500 ml/hr typical sweat rate
Table salt (fine grain NaCl)
No Salt / Nu-Salt (KCl)
In hot and humid conditions above 77°F (25°C), scale sodium to ~1,725 mg/L (3/4 tsp per liter).
Liters to prepare
~500 ml/hr typical sweat rate
Table salt (fine grain NaCl)
No Salt / Nu-Salt (KCl)
Table sugar (sucrose)
full run

gel + drink
Citric acid
Cuts sweetness, very refreshing. 1/8 tsp per gel batch, 1/4 tsp per liter drink.
gel + drink
Citrus juice / extract
Lemon, lime, or orange. Extract for gel (no added liquid); juice for drink.
gel + drink
Peppermint extract
Mild cooling sensation mid-run. A few drops only — very strong.
gel + drink
Tart cherry
Use concentrate (not regular juice). 1–2 tsp per gel batch, 1–2 tbsp per liter. Bonus anti-inflammatory benefit.

gel
Freeze-dried fruit powder
Strawberry, raspberry, mango. Intense flavor, no added liquid, blends smoothly.
gel
Raspberry powder
1–2 tsp per batch. Pairs well with citric acid and lemon extract.
gel
Cocoa powder
Pairs well with the neutral maltodextrin base. Similar to commercial chocolate gels.
gel
Espresso powder
Flavor + ~60–70 mg caffeine per tsp. Best for the final third of a long race.

drink
Ginger
Cuts saltiness and settles the stomach. Useful late in long efforts.
drink
Watermelon + lime
Blend watermelon juice with lime and citric acid. Works warm or cold.
drink
Raspberry (fresh/frozen)
Blend and strain — pulp and seeds clog soft flask valves. Pairs well with citric acid.
Avoid pulp in soft flasks (clogs bite valves). Flavor fades when cold and amplifies when warm — taste-test at run temperature. Sweetness perception drops during hard efforts, so slightly over-flavoring is not a bad idea.