Train smarter. Race faster.
Precision tools engineered for endurance athletes. Pace, nutrition, route planning — everything you need to perform on race day.
Engineered for performance
Every tool is designed to help you prepare better, not just calculate.
Precision
Science-backed algorithms — Daniels, Riegel, Karvonen — not rough estimates.
Simplicity
Clean interfaces that get straight to the point. Enter your data, get your plan.
Performance
Every detail matters on race day. Our tools help you leave nothing to chance.
free tools
training plans
distances covered
Free tools
Prepare your race in a few clicks, no signup required.
Pacer
Calculate your pace, speed and split times. From 5K to ultra-trail, road or trail.
Calculate my paceFuel Planner
Plan your nutrition and hydration. Gels, drinks, electrolytes and a complete intake schedule.
Plan my nutritionRoute Tracer
Trace your route on the map: distance, elevation, altitude profile and GPX export for your watch.
Trace my routeVMA Calculator
Calculate your VMA from a test and get personalized training zones.
Calculate my VMAFTP Calculator
Calculate your FTP (cycling) and get your Coggan power zones with Sweet Spot.
Calculate my FTPConversion Table
Convert between min/km, km/h and min/mile. Race times for all distances.
See the tableHR Zones
Calculate your heart rate training zones with 4 methods: Standard, Tanaka, Karvonen or custom.
Calculate my zonesRace Predictor
Estimate your time for any distance from a known result (Riegel, Cameron, VO2max formulas).
Estimate my timeRace Comparator
Compare up to 3 races side by side: adjusted pace, performance score and marathon equivalent.
Compare my racesExplore by category
Guides, tips and training plans by discipline.
Every detail matters on race day.
First we help, then we recommend
No sales funnel. Useful tools, then logical recommendations.
Use a tool
Calculate your pace or plan your nutrition for free.
Personalized result
Split times, nutrition plan tailored to your race.
Adapted recommendation
We show you gear suited to your goal.
You progress
Order your pack or check our guides to go further.
Shop — Coming soon
Curated gear for trail, running, triathlon and bikepacking. Each product linked to a tool for personalized recommendations.
Launch coming soonGot an idea to improve RaceDayLab?
We're building this tool for you. Suggest a feature, report a bug, or tell us what's missing.
Ready to prepare your next race?
Use our free tools. It's quick, no signup required.