Marathon Tools
Explore our curated collection of calculators and guides related to Marathon. Use these scientific tools to optimize your performance and health.
Running Pace Calculator — Pace, Speed & Race Projections
Calculate your running pace per km and per mile, speed, and projected finish times for 5K, 10K, Half Marathon, and Marathon.
Carb Loading Calculator — Race Nutrition by Body Weight
Calculate your exact carbohydrate loading targets before a 5K, 10K, Half Marathon, or Marathon based on body weight and ACSM guidelines.
Race Day Nutrition Planner — Gel Schedule & Carb Targets
Plan your complete race day nutrition: total carbs needed, exact gel timing schedule, and fluid intake targets based on race distance and pace.
Marathon Gel Calculator — How Many Gels Do You Need?
Calculate the exact number of energy gels for your marathon based on your target finish time and body weight, with a precise minute-by-minute gel schedule.
Heat Hydration Calculator — Running in Hot Weather Fluid Needs
Calculate your adjusted hourly fluid and sodium needs for running or racing in hot and humid conditions, with warning levels for dangerous heat loads.
Caffeine Gel Timing Calculator — When to Take Caffeinated Gels
Calculate the optimal timing for caffeinated energy gels during your race based on finish time, body weight, caffeine tolerance, and race start time.
Marathon Wall Predictor — Will You Hit The Wall?
Assess your risk of hitting the marathon wall based on your training mileage, longest run, carb loading plan, and gel strategy — with a personalised fix.
Pre-Race Meal Planner — What to Eat Before a Race (5K to Ultra)
Get your complete pre-race nutrition timeline — from 2 nights before to 45 minutes before the start — for any race distance, personalised by body weight.