# FuelCenter

> Free marathon fueling and race-day strategy calculators. Build a minute-by-minute gel and hydration plan for your exact race, gear, and goal pace. No signup required.

## Core tool

- [Fueling Calculator](https://fuelcenter.co/calculator): Minute-by-minute race-day fueling plan with your exact gel brand. The primary tool.

## Calculators

- [Race Time Predictor](https://fuelcenter.co/tools/race-time-predictor): Predict finish time at any distance from a recent race result using the Riegel formula.
- [Running Pace Calculator](https://fuelcenter.co/tools/pace-calculator): Enter any two of pace, time, or distance and solve for the third.
- [Heat Adjustment Calculator](https://fuelcenter.co/tools/heat-adjustment): How temperature and humidity affect marathon pace and fueling.
- [Hydration Calculator](https://fuelcenter.co/tools/hydration-calculator): Fluid and sodium needs by body weight, duration, and conditions.
- [Carb Loading Calculator](https://fuelcenter.co/tools/carb-loading-calculator): Pre-race carb loading targets by race type, body weight, and experience level.
- [Gel Comparison Tool](https://fuelcenter.co/tools/gel-comparison): Compare race gels by carbs, price, and value.

## Race guides

- [Boston Marathon](https://fuelcenter.co/races/boston-marathon): Marathon (26.2 mi) in Boston, MA. rolling course, 780 ft of gain.
- [New York City Marathon](https://fuelcenter.co/races/nyc-marathon): Marathon (26.2 mi) in New York, NY. rolling course, 890 ft of gain.
- [Chicago Marathon](https://fuelcenter.co/races/chicago-marathon): Marathon (26.2 mi) in Chicago, IL. flat course, 243 ft of gain.
- [Berlin Marathon](https://fuelcenter.co/races/berlin-marathon): Marathon (26.2 mi) in Berlin, Germany. flat course, 100 ft of gain.
- [London Marathon](https://fuelcenter.co/races/london-marathon): Marathon (26.2 mi) in London, England. rolling course, 260 ft of gain.
- [Tokyo Marathon](https://fuelcenter.co/races/tokyo-marathon): Marathon (26.2 mi) in Tokyo, Japan. flat course, 130 ft of gain.
- [Grandma’s Marathon](https://fuelcenter.co/races/grandmas-marathon): Marathon (26.2 mi) in Duluth, MN. rolling course, 440 ft of gain.
- [Eugene Marathon](https://fuelcenter.co/races/eugene-marathon): Marathon (26.2 mi) in Eugene, OR. rolling course, 487 ft of gain.
- [Nashville Rock 'n' Roll Marathon](https://fuelcenter.co/races/nashville-marathon): Marathon (26.2 mi) in Nashville, TN. hilly course, 922 ft of gain.
- [Flying Pig Marathon](https://fuelcenter.co/races/flying-pig-marathon): Marathon (26.2 mi) in Cincinnati, OH. hilly course, 1,074 ft of gain.
- [Paris Marathon](https://fuelcenter.co/races/paris-marathon): Marathon (26.2 mi) in Paris, France. rolling course, 474 ft of gain.
- [Rotterdam Marathon](https://fuelcenter.co/races/rotterdam-marathon): Marathon (26.2 mi) in Rotterdam, Netherlands. flat course, 95 ft of gain.
- [Hamburg Marathon](https://fuelcenter.co/races/hamburg-marathon): Marathon (26.2 mi) in Hamburg, Germany. flat course, 140 ft of gain.
- [Copenhagen Marathon](https://fuelcenter.co/races/copenhagen-marathon): Marathon (26.2 mi) in Copenhagen, Denmark. flat course, 130 ft of gain.
- [California International Marathon](https://fuelcenter.co/races/california-international-marathon): Marathon (26.2 mi) in Sacramento, CA. rolling course, 663 ft of gain.
- [Philadelphia Marathon](https://fuelcenter.co/races/philadelphia-marathon): Marathon (26.2 mi) in Philadelphia, PA. rolling course, 650 ft of gain.
- [Twin Cities Marathon](https://fuelcenter.co/races/twin-cities-marathon): Marathon (26.2 mi) in Minneapolis, MN. rolling course, 575 ft of gain.
- [Marine Corps Marathon](https://fuelcenter.co/races/marine-corps-marathon): Marathon (26.2 mi) in Arlington, VA. rolling course, 699 ft of gain.
- [Indianapolis Monumental Marathon](https://fuelcenter.co/races/indianapolis-monumental-marathon): Marathon (26.2 mi) in Indianapolis, IN. flat course, 180 ft of gain.
- [Portland Marathon](https://fuelcenter.co/races/portland-marathon): Marathon (26.2 mi) in Portland, OR. rolling course, 873 ft of gain.
- [Baystate Marathon](https://fuelcenter.co/races/baystate-marathon): Marathon (26.2 mi) in Lowell, MA. flat course, 507 ft of gain.
- [Detroit Free Press Marathon](https://fuelcenter.co/races/detroit-marathon): Marathon (26.2 mi) in Detroit, MI. flat course, 388 ft of gain.
- [Columbus Marathon](https://fuelcenter.co/races/columbus-marathon): Marathon (26.2 mi) in Columbus, OH. flat course, 525 ft of gain.
- [Toronto Waterfront Marathon](https://fuelcenter.co/races/toronto-waterfront-marathon): Marathon (26.2 mi) in Toronto, ON. flat course, 453 ft of gain.
- [Richmond Marathon](https://fuelcenter.co/races/richmond-marathon): Marathon (26.2 mi) in Richmond, VA. rolling course, 685 ft of gain.
- [Valencia Marathon](https://fuelcenter.co/races/valencia-marathon): Marathon (26.2 mi) in Valencia. flat course, 150 ft of gain.
- [Houston Marathon](https://fuelcenter.co/races/houston-marathon): Marathon (26.2 mi) in Houston, TX. flat course, 225 ft of gain.
- [Athens Marathon](https://fuelcenter.co/races/athens-marathon): Marathon (26.2 mi) in Athens, Greece. hilly course, 1,100 ft of gain.
- [Route 66 Marathon](https://fuelcenter.co/races/route-66-marathon): Marathon (26.2 mi) in Tulsa, OK. rolling course, 822 ft of gain.
- [Mount Desert Island Marathon](https://fuelcenter.co/races/mount-desert-island-marathon): Marathon (26.2 mi) in Bar Harbor, ME. hilly course, 1,650 ft of gain.
- [Irish Life Dublin Marathon](https://fuelcenter.co/races/dublin-marathon): Marathon (26.2 mi) in Dublin. rolling course, 673 ft of gain.
- [Guthrie Wineglass Marathon](https://fuelcenter.co/races/wineglass-marathon): Marathon (26.2 mi) in Corning, NY. flat course, 392 ft of gain.
- [Steamtown Marathon](https://fuelcenter.co/races/steamtown-marathon): Marathon (26.2 mi) in Scranton, PA. rolling course, 518 ft of gain.
- [TCS Amsterdam Marathon](https://fuelcenter.co/races/amsterdam-marathon): Marathon (26.2 mi) in Amsterdam. flat course, 230 ft of gain.
- [Mainova Frankfurt Marathon](https://fuelcenter.co/races/frankfurt-marathon): Marathon (26.2 mi) in Frankfurt am Main. flat course, 268 ft of gain.
- [Honolulu Marathon](https://fuelcenter.co/races/honolulu-marathon): Marathon (26.2 mi) in Honolulu, HI. rolling course, 641 ft of gain.
- [Walt Disney World Marathon](https://fuelcenter.co/races/disney-world-marathon): Marathon (26.2 mi) in Lake Buena Vista, FL. flat course, 260 ft of gain.
- [Los Angeles Marathon](https://fuelcenter.co/races/los-angeles-marathon): Marathon (26.2 mi) in Los Angeles, CA. rolling course, 943 ft of gain.
- [Sanlam Cape Town Marathon](https://fuelcenter.co/races/cape-town-marathon): Marathon (26.2 mi) in Cape Town. rolling course, 705 ft of gain.
- [Napa Valley Marathon](https://fuelcenter.co/races/napa-valley-marathon): Marathon (26.2 mi) in Calistoga to Napa, CA. rolling course, 564 ft of gain.
- [Big Sur International Marathon](https://fuelcenter.co/races/big-sur-marathon): Marathon (26.2 mi) in Big Sur to Carmel, CA. hilly course, 2,182 ft of gain.
- [Tamarack Ottawa International Marathon](https://fuelcenter.co/races/ottawa-marathon): Marathon (26.2 mi) in Ottawa, ON. flat course, 660 ft of gain.
- [BMO Vancouver Marathon](https://fuelcenter.co/races/vancouver-marathon): Marathon (26.2 mi) in Vancouver, BC. rolling course, 550 ft of gain.
- [UTMB (Ultra-Trail du Mont-Blanc)](https://fuelcenter.co/races/utmb): 106 Miles (171K) in Chamonix, France. mountainous course, 32,800 ft of gain.
- [Leadville Trail 100](https://fuelcenter.co/races/leadville-100): 100 Miles in Leadville, CO. mountainous course, 15,600 ft of gain.

## Blog

- [Grandma’s Marathon Fueling Plan: Mile-by-Mile Strategy](https://fuelcenter.co/blog/grandmas-marathon-fueling-plan): Course-specific fueling for Grandma’s Marathon in Duluth. Aid stations, Lemon Drop Hill, heat contingency.
- [Chicago Marathon Fueling Plan: Mile-by-Mile Strategy](https://fuelcenter.co/blog/chicago-marathon-fueling-plan): Course-specific fueling for the Chicago Marathon. Gel timing, exposed west-side miles, October weather.
- [Copenhagen Marathon Fueling Plan: Mile-by-Mile Strategy](https://fuelcenter.co/blog/copenhagen-marathon-fueling-plan): Fueling for the flat Copenhagen course. Aid stations, wind, and how to use the profile for a PR.
- [How to Practice Race Fueling on Long Runs](https://fuelcenter.co/blog/practice-race-fueling-long-runs): Train your gut, build carb tolerance to 80–100 g/hr, and dial in your race-day protocol.
- [The Science of Race Fueling: Why High-Carb Works and How to Get There](https://fuelcenter.co/blog/marathon-fueling-science): Dual transporter model, gut training, and research on 90–120 g carbs/hr vs. the old 30–60 g standard.
- [London Marathon Fueling Plan: Mile-by-Mile Strategy](https://fuelcenter.co/blog/london-marathon-fueling-plan): Fueling for the 2026 London Marathon. Tower Bridge, Canary Wharf discipline, Lucozade Sport notes.
- [Running in the Heat: How Temperature Affects Pace and Fueling](https://fuelcenter.co/blog/running-in-the-heat): Research-backed breakdown of heat and marathon pace. Temperature ranges, sodium, heat adaptation.
- [Boston Marathon Fueling Plan: Mile-by-Mile Strategy](https://fuelcenter.co/blog/boston-marathon-fueling-plan): Fueling for the Boston Marathon. Gel timing, Newton Hills, and how weather changes the plan.
- [How Many Gels Do You Need for a Marathon?](https://fuelcenter.co/blog/how-many-gels-marathon): Exact gel counts by brand, carb target, and finish time at 80 g carbs per hour.
- [Best Race-Day Gels Ranked by Carbs per Dollar (2026)](https://fuelcenter.co/blog/best-race-gels-2026): Seven popular gels ranked by carbs-per-dollar, gut reputation, and usability.

## Reference

- [Blog index](https://fuelcenter.co/blog): All marathon fueling and race-nutrition posts.
- [Tools index](https://fuelcenter.co/tools): All running calculators.
- [Races index](https://fuelcenter.co/races): All race strategy pages.
- [About](https://fuelcenter.co/about): What FuelCenter is and who builds it.