Stop Guessing. Start Fueling Right.
The science-backed nutrition calculator that helps ultrarunners finish strong.
Trusted by Hundreds of Ultrarunners • By Runners for Runners • Personalized Premium Calculator
Why Ultrarunners Get Nutrition Wrong
- Copying someone else's plan - What works for a 150lb runner won't work for you
- Guessing your needs - "I'll take a gel every 45 minutes" isn't a strategy
- Ignoring the science - Your body has specific carb and sodium requirements
- No backup plan - When your stomach rebels at mile 40, what's your Plan B?
- Know exactly how many carbs, fluids, and sodium you need per hour
- Get multiple strategies - gels, chews, real food, and backup options
- See your hourly timeline - what to consume and when, for your entire race
- Avoid common mistakes - GI issues, bonking, hyponatremia, and taste fatigue
Everything you Need to Nail Race Day Nutrition
Personalized Calculations
Get exact numbers based on your weight, race duration, effort level, weather conditions, and more. Not generic advice - YOUR numbers.
Multiple Fuel Strategies
Compare gels, chews, real food, and sports drinks. See costs, convenience, and how to mix strategies for optimal performance.
Hourly Timeline
Never wonder "what do I eat now?" Get a detailed hour-by-hour breakdown of your fueling strategy from start to finish.
Science-Backed
Based on peer-reviewed sports nutrition research and recommendations from the International Society of Sports Nutrition.
Save & Share Plans
Premium users can save unlimited plans, load them on race day, and share them with crew or training partners.
Advanced Strategies
Dual carb formulas, caffeine timing, altitude adjustments, electrolyte optimization, and night race protocols.
Three Steps to Race Day Confidence
Enter Your Details
Body weight, race duration, effort level, weather conditions, and experience level. Takes 90 seconds.
Get Your Plan
Instantly receive personalized carb, fluid, and sodium targets plus multiple fueling strategies to choose from.
Race with Confidence
Follow your hour-by-hour timeline. Know exactly what to consume and when. Finish strong.
Calculate your Personalized Nutrition Plan
Get your basic race nutrition plan in seconds.
Your Basic Nutrition Plan
Suggested Fueling Options
🚀 Want More Advanced Features?
Get custom fuel library, saved plans, PDF exports, weather integration, pre-race carb loading, and recovery plans
Upgrade to PremiumTrusted by Ultrarunners Worldwide
Free
- Basic nutrition calculator
- Carb, fluid & sodium targets
- Single fuel strategy
- General recommendations
Annual
- All premium features
- Unlimited saved plans
- Dual-carb optimization
- Altitude adjustments
- Caffeine recommendations
- Priority support
- Save 8% vs monthly
Monthly
- All premium features
- Unlimited saved plans
- Dual-carb optimization
- Altitude adjustments
- Caffeine recommendations
- Priority support
Free vs Premium Features
| Feature | Free | Premium |
|---|---|---|
| Basic Calculator | ✓ | ✓ |
| Carb/Fluid/Sodium Targets | ✓ | ✓ |
| Save Plans w/ Additional Race Details | ✗ | ✓ |
| Multiple Fuel Strategies | ✗ | ✓ |
| Hour-by-Hour Timeline | ✗ | ✓ |
| Advanced Strategies & Risk Analysis | ✗ | ✓ |
| Race Report PDF Export | ✗ | ✓ |
| Cost Comparison & Fuel Suggestions | ✗ | ✓ |
| Altitude & Heat Adjustments | ✗ | ✓ |
| OpenWeather API Integration | ✗ | ✓ |
Yes! Whether you're running a 50K or a 200-miler, the calculator adjusts recommendations based on your specific race duration and conditions.
Absolutely. The calculator factors in effort level and terrain through the effort level setting (easy, moderate, hard, extreme).
The calculator provides multiple fueling strategies including real food options. You can mix and match based on your dietary needs and preferences.
This calculator uses YOUR specific data - weight, sweat rate, race conditions - to give you exact numbers, not one-size-fits-all recommendations.
Yes! Premium users can access their saved plans from any device and make adjustments as conditions change.
The calculator provides backup strategies and the risk analysis section includes specific recommendations for GI issues and taste fatigue.
YES! Always test your nutrition strategy during training runs. The calculator gives you a starting point, but your gut needs practice.
No, we use subscription-based model, where you have the choice to select between monthly or annual plan .
Ready to stop bonking and start finishing strong?
Calculate your personalized nutrition plan in under 2 minutes.