Race Fueling Calculator
Get science-based, personalized nutrition recommendations for your next race!
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Master Your Race Nutrition
Everything you need to know for peak performance
Pre-Race Preparation
Carbohydrate Loading
Carb-loading maximizes muscle glycogen, your body's most accessible fuel source, for endurance events.
- When: Start 2-3 days before your race
- What: Shift to 70-80% carbohydrates (pasta, rice, potatoes)
- Why: Can delay fatigue by up to 20% in events over 90 minutes
- Tip: Reduce fiber and fat. Don't stuff yourself; just change the macro balance
Race Morning Breakfast
Your pre-race meal tops off glycogen stores and ensures hydration without causing digestive issues.
- When: Eat 2-4 hours before the start
- What: 1-2g of carbs per kg of body weight
- Avoid: High-fat, high-fiber, or excessively large meals
During Race Fueling
Carbohydrates: The Engine
For events over 60-90 minutes, consuming carbs is crucial to maintain blood glucose and spare muscle glycogen.
- How Much: 30-90g per hour, based on duration and tolerance
- Sources: Gels, chews, sports drinks, whole foods
- Timing: Start early (first 30-45 mins), fuel every 15-20 mins
Hydration & Electrolytes
A 2% body weight loss from dehydration can severely impair performance. Sodium is vital for fluid balance.
- Fluids: 400-800ml per hour, adjusted for conditions
- Sodium: 300-600mg per hour, more in heat
- Tip: Follow a schedule, don't just rely on thirst
Practice & Recovery
Practice Your Strategy
"Nothing New on Race Day" - Your gut is trainable just like your muscles.
- Simulate: Test exact foods, drinks, and timing in training
- Train Your Gut: Gradually increase hourly carb intake
- Build Confidence: Know exactly what works for you
The 4 R's of Recovery
Effective recovery starts the moment you cross the finish line.
- Refuel: 1-1.2g carbs per kg within 30-60 minutes
- Repair: 20-30g protein (3:1 carb-to-protein ratio)
- Rehydrate: 1.2-1.5L per kg of body weight lost
- Rest: Your body repairs and adapts during sleep
🎯 Remember: Consistency Beats Perfection
The best nutrition plan is the one you can execute reliably. Start simple, practice often, and refine based on your experience.
Disclaimer
This nutrition calculator is for educational and informational purposes only and is not intended as medical advice, diagnosis, or treatment. The recommendations provided are general guidelines based on sports nutrition research and should not replace professional medical advice. Individual nutritional needs vary significantly based on health conditions, medications, allergies, and other factors. Before making any changes to your nutrition or training regimen, especially if you have pre-existing health conditions, consult with a qualified healthcare provider, registered dietitian, or sports nutritionist. The creators of this calculator are not responsible for any adverse effects or consequences resulting from the use of this information.