The tools,
free and unlocked.
Small, honest calculators that answer one question each. Start anywhere. When you want the whole race handled in one schedule, the full plan is one click away.
Your full fueling plan
Six questions and you get the whole race: carbs an hour, fluid, sodium, and every feed placed on your actual course. This is the one that replaces the guesswork.
Example for a 3:30 Boston runner — yours is computed from your answers.
Caffeine dose calculator
How much actually helps, and where more just buys you jitters. Your dose from your body weight, on the evidence-backed 3–6 mg/kg range.
Most runners get the timing wrong, not the dose — taken at the gun it peaks by mile 8.
Drink-mix builder
How strong to mix your bottle, and what that means in grams per hour. Concentration is what decides whether your stomach can empty it at all.
Past 8% the gut empties slower than it absorbs.
Cheapest way to hit your target
Every priced fuel and every gel-plus-drink combo ranked by what the whole race costs at your carbs-per-hour. Test two from the top, not a variety pack.
Example spread across the catalog — yours is computed from your target.
Scenario answers
Hot marathon with a sensitive stomach, first half, sub-3 caffeine plan, 50-miler when gels stop working — answered from the database, then tuned to you in one click.
What's your fueling type?
Five questions, one named type, and the science behind why your gut behaves the way it does — plus the products that suit it.
Five types, each with its own fuelling failure mode.
Find my fuel
Answer five quick questions and the whole database re-ranks around your race, your sweat, and your gut. Or skip the quiz and filter it yourself.
Sorted by evidence, never by who pays us.
The fuel database
Every gel, chew, bar, drink mix and electrolyte we've verified against its own label. Carbs, sodium, caffeine, glucose:fructose ratio, cost per 25 g of carbs.
Compare any two side by side.
Every tool here is free and needs no account. They each answer one question well — but carbs, fluid, sodium, caffeine and the course all interact, so a number in isolation only gets you part of the way. The plan is where they resolve into one schedule.
Or skip the one-offs and get the whole race
One schedule that already accounts for your course, your sweat rate, your gut ceiling and the forecast — then guides you through it live on race day.