---
title: "Carbs Per Hour Running Calculator | TrainPace"
description: "Carbs per hour running calculator. Enter your race distance and finish time to get a personalized carb target and convert it into gels and timing."
url: https://trainpace.com/fuel/carbs-per-hour-running-calculator
---

# Carbs Per Hour Running Calculator

Carbs per hour running calculator. Enter your race distance and finish time to get a personalized carb target and convert it into gels and timing.

Enter your race distance and goal time to calculate your ideal carbs-per-hour target. Get a specific number you can train with and execute on race day.

- Personalized carbs/hour from your race data
- Works for half marathon through ultra distances
- Converts your target into gels and a schedule

## How to calculate your carbs per hour for running

Get a personalized carbs-per-hour number based on your race distance and goal time.

1. Choose your distance: Select your race distance (half marathon, marathon, or custom).
2. Enter your goal time: Input the finish time you are training for.
3. Get your number: See your carbs/hour target, total carbs, and how many gels that translates to.

## Frequently asked questions

### How do I calculate carbs per hour for running?

Divide your total carb target by race duration in hours. For example, 240g over 4 hours = 60g/hour. This calculator does the math for you from your finish time.

### Is 60g per hour enough for a marathon?

60g/hour is a good starting point and works well for many runners. Some benefit from pushing toward 80-90g/hour with gut training and the right products.

- [Calculate Your Carbs/Hour](https://trainpace.com/fuel)

## Fueling reference

**Race-day carb targets and gel counts by finish time (baseline, no body weight entered)**

| Race | Finish time | Carbs/hour | Total carbs | Calories | Gels |
| --- | --- | --- | --- | --- | --- |
| Half marathon | 1:20 | 45 g/hr | 60 g | 240 kcal | 2 |
| Half marathon | 1:35 | 45 g/hr | 71 g | 284 kcal | 3 |
| Half marathon | 1:50 | 45 g/hr | 83 g | 332 kcal | 3 |
| Half marathon | 2:05 | 45 g/hr | 94 g | 376 kcal | 4 |
| Half marathon | 2:20 | 45 g/hr | 105 g | 420 kcal | 4 |
| Marathon | 2:50 | 75 g/hr | 213 g | 852 kcal | 5 |
| Marathon | 3:15 | 75 g/hr | 244 g | 976 kcal | 5 |
| Marathon | 3:45 | 75 g/hr | 281 g | 1124 kcal | 6 |
| Marathon | 4:15 | 75 g/hr | 319 g | 1276 kcal | 7 |
| Marathon | 4:45 | 75 g/hr | 356 g | 1424 kcal | 7 |
| Marathon | 5:15 | 75 g/hr | 394 g | 1576 kcal | 7 |

## Other TrainPace tools

- [Pace Calculator](https://trainpace.com/calculator) — training paces from a recent race result
- [VDOT Calculator](https://trainpace.com/vdot) — fitness score and equivalent race times
- [Training Plan Builder](https://trainpace.com/plan) — week-by-week 5K to marathon plans
- [Race Fuel Planner](https://trainpace.com/fuel) — carbs per hour and gel counts
- [Elevation Finder](https://trainpace.com/elevation-finder) — GPX route and climb analysis

## For AI agents

Every page on this site has a Markdown mirror at the same path with a .md suffix (for example /calculator.md), and honors an Accept: text/markdown request header on the HTML URL. The calculations here are also available as callable tools through a free public MCP server — no account or API key.

- [llms.txt](https://trainpace.com/llms.txt) — site index for agents
- [llms-full.txt](https://trainpace.com/llms-full.txt) — every page's Markdown in one file
- [MCP server docs](https://trainpace.com/mcp) — endpoint, tools, and client setup