Free pacing and fueling tools for marathon runners. Pick a race, enter your goal time and gel brand, and get a mile-by-mile strategy with elevation-adjusted pace splits and gel timing built for the actual course. All 6 World Marathon Majors plus 6 more popular races. 10 gel brands. Also includes a pace calculator, race time predictor, heat adjustment, and hydration calculators, and a growing blog with gel comparisons and race-specific fueling guides.

Lightfield — AI-native CRM that builds itself and does work for you

AI-native CRM that builds itself and does work for you

Hey PH! I'm Cody. I started running in 2023 and got hooked immediately. Five marathons later, I'm training for my first sub3 attempt this May in Copenhagen. Before building this, I was spending about 15 minutes before every workout and long run doing math on my iPhone calculator—how many carbs do I need? How many gels is that? When do I take each one? What if I'm using drink mix too? Dialing in my fueling was becoming pretty annoying. So I built FuelCenter. It started as a fueling calculator and grew into a full race-planning toolkit — 14 races, 10 gel brands, a pace calculator, heat adjustment, a hydration calculator, and a blog with deep dives into race-specific fueling strategy. You pick a race, enter your goal time and gel brand, and get a mile-by-mile plan where the pace splits are adjusted for the actual course terrain, and the gel timing is layered on top. The tools are free to use, with the option to print a premium race sheet PDF for $5. Would love to hear feedback — especially from runners who've bonked from underfueling on race day. What would make this more useful for you as a runner?

Lightfield — AI-native CRM that builds itself and does work for you

AI-native CRM that builds itself and does work for you

FuelCenter

Free personalized pacing and fueling tools for runners

Free personalized pacing and fueling tools for runners