Pick your race, enter your pace, and get a gel-by-gel nutrition plan aligned to actual on-course aid stations — so you know exactly when and where to fuel.
Free · No sign-up required · Based on peer-reviewed sports science
Berlin Marathon
Berlin, Germany
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London Marathon
London, United Kingdom
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Paris Marathon
Paris, France
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Rotterdam Marathon
Rotterdam, Netherlands
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Tokyo Marathon
Tokyo, Japan
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Barcelona Marathon
Barcelona, Spain
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Rome Marathon
Rome, Italy
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Prague Marathon
Prague, Czech Republic
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Madrid Marathon
Madrid, Spain
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Copenhagen Marathon
Copenhagen, Denmark
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Milan Marathon
Milan, Italy
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Vienna City Marathon
Vienna, Austria
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Boston Marathon
Boston, United States
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Hamburg Marathon
Hamburg, Germany
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Zurich Marathon
Zurich, Switzerland
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Dublin Marathon
Dublin, Ireland
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Edinburgh Marathon
Edinburgh, UK
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Munich Marathon
Munich, Germany
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Lisbon Marathon
Lisbon, Portugal
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New York City Marathon
New York City, USA
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Chicago Marathon
Chicago, USA
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Amsterdam Marathon
Amsterdam, Netherlands
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Stockholm Marathon
Stockholm, Sweden
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Frankfurt Marathon
Frankfurt, Germany
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Athens Marathon
Athens, Greece
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Florence Marathon
Florence, Italy
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Seville Marathon
Seville, Spain
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Istanbul Marathon
Istanbul, Turkey
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Sydney Marathon
Sydney, Australia
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Singapore Marathon
Singapore, Singapore
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Dubai Marathon
Dubai, UAE
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Cape Town Marathon
Cape Town, South Africa
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Marathon
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Manchester Marathon
Manchester, UK
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Brussels Marathon
Brussels, Belgium
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Melbourne Marathon
Melbourne, Australia
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Great North Run
Newcastle, UK
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Gothenburg Half Marathon
Gothenburg, Sweden
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Lisbon Half Marathon
Lisbon, Portugal
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Paris Half Marathon
Paris, France
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Berlin Half Marathon
Berlin, Germany
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Prague Half Marathon
Prague, Czech Republic
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Copenhagen Half Marathon
Copenhagen, Denmark
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Valencia Half Marathon
Valencia, Spain
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Barcelona Half Marathon
Barcelona, Spain
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Royal Parks Half Marathon
London, UK
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Half Marathon
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Our race fueling calculator uses peer-reviewed sports science from researchers like Jeukendrup and Burke to determine your optimal carbohydrate, hydration, and sodium targets. Unlike generic calculators, we map your gel timing to actual on-course aid stations — so your plan tells you not just when to fuel, but where on the course to do it.
Enter your target pace, body metrics, gel preference, and race conditions. The calculator generates a complete race day plan including breakfast recommendations, caffeine timing, and a minute-by-minute gel schedule you can follow on race day.
Each plan includes an interactive course map with gel markers and an elevation profile, so you can visualize your fueling strategy against the terrain. Plans can be copied and saved for race day reference.