Calculate daily nutrition, session fueling, and race nutrition strategies
2026-06-01
Planning guidance only, not personalized sports nutrition advice
For calculating session fueling needs
Affects race-day fueling strategy
Daily Nutrition Plan
Total Calories
2625
kcal/day
Carbs | Protein | Fat
341g | 118g | 88g
Session Carbs
68g
900mL fluid
OLYMPIC Race Strategy (2-3 hrs)
Target Carbs per Hour
45g/hour
Strategy
Single bottle or gel pack; 1-2 gels or sports drink
Post-Workout Recovery (within 30-60 min)
Carbs
90g
Protein
19g
Total
436
kcal
Example: Bagel with PB + glass of chocolate milk, or pasta + grilled chicken
| Event | Duration | During Race |
|---|---|---|
| Sprint | 1-1.5 hrs | Water only |
| Olympic | 2-3 hrs | Sports drink if desired |
| Half-IM | 4-6 hrs | 60g CHO/hr, fluids |
💡 Pro Tip: Practice nutrition in training. Dehydration & bonking are race killers. Aim 500-750ml/hour. Test all race fuel in workouts first.
Triathlon nutrition is a comprehensive approach to eating for multisport training and racing. Because triathletes train across three disciplines (swim, bike, run) with different energy demands and recovery needs, nutrition must support both daily training and competition-day performance. Proper fueling increases power, delays fatigue, and improves recovery—meaning you train harder and adapt faster.
Why Triathlon Nutrition Matters:
Triathlon nutrition is not one-size-fits-all. Variables include body size, training volume, race duration, GI tolerance, and goals. This calculator provides planning guidance and starting points, not personalized sports nutrition advice.
Triathlon nutrition is built on three pillars: daily macros, session-specific fueling, and race-day strategy. Use the outputs as planning guidance rather than a one-size-fits-all prescription.
Step 1: Daily Caloric Needs
Daily Calories = Body Weight (kg) × Multiplier
Base: 30 kcal/kg | Build: 35 kcal/kg | Peak: 40 kcal/kg
Step 2: Daily Macronutrients
Carbs: 52% of calories ÷ 4 kcal/g
Protein: 18% of calories ÷ 4 kcal/g
Fat: 30% of calories ÷ 9 kcal/g
Step 3: Session Fueling
Session Carbs ≈ (Duration in hours) × 45g/hour
Hydration: 500–700 mL/hour based on intensity
Step 4: Race Strategy
Sprint (<2 hrs): Minimal fueling | Olympic (2–3 hrs): 30–45g/hour
Half-iron (3–5 hrs): 60g/hour | Full iron (5–8+ hrs): 80–90g/hour
💡 Pro Tip: Fueling needs scale with intensity and duration. Short, easy swims need zero fueling. Long, hard bike sessions need 30–45g carbs. Most triathletes under-fuel during training, then over-eat post-workout trying to compensate.
Scenario: Sarah, a 65 kg female triathlete, is in her "Build" phase training for an Olympic-distance race in 12 weeks. She trains 10 hours/week and has a 90-minute bike session planned tomorrow. What are her daily and session nutrition targets?
Step-by-Step Calculation:
â‘ Daily Calories (Build Phase)
65 kg × 35 kcal/kg = 2,275 kcal/day
â‘¡ Daily Macros
Carbs: (2,275 × 0.52) ÷ 4 = 295g
Protein: (2,275 × 0.18) ÷ 4 = 102g
Fat: (2,275 × 0.30) ÷ 9 = 76g
â‘¢ Session Fueling (90-min bike)
Session Carbs: (1.5 hrs) × 45g/hour = 68g
Hydration: (1.5 hrs) × 650 mL/hr = 975 mL
â‘£ Olympic Race Strategy
Duration: ~2.5–3 hours
Carbs/hour: 45g (4 gels + 1 sports drink bottle)
Sarah's Daily & Session Plan:
"Daily breakfast, lunch, dinner totaling 295g carbs, 102g protein. Tomorrow's 90-min bike: energy bar before start, 2 gels at 30 and 60 min, 1 sports drink bottle, water as needed. Post-ride: banana + greek yogurt (~65g carbs, 17g protein) within 60 min to kickstart recovery."
How do I fuel during swimming?
Swimming underwater makes fueling nearly impossible. Pre-load carbs 30 min before the swim, hydrate after. No in-water gels or bottles.
What's the best pre-workout meal?
Eat 2–3 hours before training: oatmeal + fruit, toast + peanut butter, or pasta + tomato sauce. Aim for 1–4g carbs/kg body weight.
Can I fuel during a 1-hour spin?
No; water is sufficient. Save gels, bars, and energy drinks for sessions >90 min or high-intensity efforts.
What should I eat post-workout?
3:1 or 4:1 carbs-to-protein ratio within 60 min: banana + yogurt, pasta + chicken, smoothie with oats + whey, or chocolate milk.
How much protein do triathletes need?
1.2–1.6g/kg/day to support muscle repair across three sports. Spread across meals for better absorption.
Should I practice race nutrition during training?
Absolutely. Test gels, bars, and sports drinks during long sessions. GI systems adapt; what works in training works on race day.
Do I need special supplements?
Whole foods are superior. Consider amino acids, electrolytes, or beetroot juice only after mastering food-based nutrition.
How do I avoid GI issues during racing?
Practice fueling during training. Limit fiber & fat 3 hours pre-race. Sip fluids frequently; don't do big boluses.
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