Triathlon Nutrition Calculator for Race Fueling

Triathlon Nutrition Calculator

Plan race-day fueling by estimating calories burned across swim, bike, and run segments, then translating that into carbs to replace, snack frequency, and fluid intake for your target finish time.

Why Nutrition Matters in Triathlon

Glycogen stores are limited, so longer races require steady carbohydrate intake and hydration. Because the swim leg makes eating difficult, most fueling happens on the bike and run.

Related Triathlon Tools

Estimate finish splits with our Average Triathlon Finish Times Calculator, plan weekly volume with the Triathlon Training Calculator, and set intensity zones with Triathlon Heart Rate.

Frequently Asked Questions

How many calories will I burn in a triathlon?

Total burn depends on body weight, race distance, and target time. Heavier athletes and longer events generally burn more calories across all three disciplines.

When should I start eating during a race?

Start taking in carbohydrates within the first hour, even if you do not feel hungry yet. Most athletes fuel every 20-30 minutes on the bike and run.

How much should each snack contain?

Aim for about 90-110 kcal per snack during the bike and run. Energy gels, dates, and ripe bananas are common choices.

How much fluid should I drink?

Many athletes target about 16 fl oz of electrolyte drink per hour, sipping regularly rather than drinking large amounts at once.

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