Marathon Fueling Calculator
Estimate a simple marathon carb plan from your planned finish time, target carbs per hour, and gel size.
Plan Race Fueling
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Marathon fueling calculator guide
WeCovr's marathon fueling calculator estimates a simple race carb plan from finish time, target grams per hour, and gel size.
What this marathon-fueling calculator does
This page estimates total carbohydrate needs for a marathon and converts that target into an approximate number of gels.
Uses race duration and target carbs per hour.
Converts total carbs into approximate gels.
Adds a simple every-30-minutes carb target.
Why marathon fueling matters
Long races often go better when pacing and fueling are planned together rather than improvised late in the day.
Why this plan is only a starting point
Your actual strategy may depend on drink mix, aid stations, stomach tolerance, weather, pace changes, and whether you have practiced race fueling in training.
Marathon planning tools
| Tool | Focus | Typical use |
|---|---|---|
| Marathon fueling | Carbohydrate plan | Race-day fueling |
| Marathon split | Checkpoint timing | Pacing review |
| Marathon bonk risk | Rough fade risk | Planning check |
Related WeCovr resources
FAQs
How many grams of carbs per hour should I target?
That depends on race intensity, product choice, and what you have practiced in training. This calculator only turns your chosen target into a simple plan.
Does this include sports drink and chews?
It can if you treat the total as a combined carb target across gels, chews, and drink mix.
Should I start fueling late in the race?
Many runners prefer to fuel early and consistently rather than waiting until they feel depleted.
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