Estimate Your Race Day Fuel

In ultra-distance trail racing, your success doesn't come down to flat mile splits—it’s entirely about time-on-feet, technical terrain management, and protecting your gut over hours of continuous effort. Whether you're building up for a local 50k block or dialing in gear for race day, use this calculator to establish your baseline hourly carbohydrate and hydration targets. Treat this formula as your starting line, then test and refine your fueling strategy during long training runs.