Tool
Inputs → outputs
This page is intentionally practical: get numbers first, then read the how-to.
Inputs
- • Finish time (hh:mm)
- • Carbs per hour (g/h)
- • Dose interval (minutes)
- • Carbs per gel (g) (optional)
Outputs
- • Total carbs (g)
- • Approx gels (count)
- • Dose schedule
Examples
Planner
Marathon fueling schedule
A simple, repeatable plan: pick a carb target, then schedule doses you can actually execute while running.
Total time
Total carbs
Approx gels
Simple schedule
Take a dose every 20 minutes. In training, practice the same timing so race day is automatic.
Safety note: fueling targets vary by athlete and conditions. Practice in training and adjust if you get GI distress. This is not medical advice.
Assumptions
What this tool assumes
- • Carb target is a training-tested number for you (GI tolerance varies).
- • You can execute the schedule while running (practice with the same products).
Limitations
What can break it
- • Does not prescribe medical nutrition or account for diabetes or GI disease.
- • Heat, intensity, and aid-station options change what’s practical; adjust on race week.
Related
Use this with a plan
Coaching beta
Get a plan that adapts to your life.
Join the 26weeks.ai TestFlight beta for adaptive coaching, recovery-aware adjustments, and race-week reminders.
FAQs
What carb target should I use?
Use a target you can tolerate in training. Many athletes land somewhere between 60–90 g/h, but the right number is individual.
When should I start taking carbs?
Earlier than you think. A simple rule is start within the first 30 minutes, then follow the schedule.
Do I need sodium?
It depends on sweat rate, heat, and what you tolerate. If you use electrolytes, practice with them in training and avoid overdoing it.
Keep going
18-Week Marathon Training Plan
A 18-week marathon training plan with week-by-week structure, workouts, adaptation rules, and built-in pace + fueling tools. Variations are included on one page.
24-Week Marathon Training Plan
A 24-week marathon training plan with week-by-week structure, workouts, adaptation rules, and built-in pace + fueling tools. Variations are included on one page.
Marathon Races (Directory + Athlete Guides)
Curated marathon race directory with athlete guides. Facts include sources, verification timestamps, and planning tools.
BMW Berlin Marathon 2026: date, registration, course, weather
Athlete guide for BMW Berlin Marathon 2026: date, location, climate context, training timeline, and pacing/fueling tools.
Taper Week Checklist (Arrive Fresh, Not Flat)
A practical taper checklist: what to reduce, what to keep, and what to rehearse so race week is calm and repeatable.