How do I calculate marathon splits?

Choose a marathon course or distance, enter your goal finish time, select kilometers or miles, and generate a split-by-split pacing plan.

Should marathon pace change on hills?

A hill-adjusted plan usually slows the target pace on climbs and allows faster splits on descents so the effort stays more even across the course.

What is an elevation-adjusted pace plan?

An elevation-adjusted pace plan uses the course profile to distribute effort by split instead of assuming the same pace for every kilometer or mile. The goal is to slow slightly on climbs, recover time on descents, and still hit your target finish time.

Free race pace planner

Elevation-adjusted marathon pace calculator

Build kilometer or mile splits with elevation-adjusted pacing for major marathon course profiles like Boston, New York City, Chicago, London, Berlin, Tokyo, and Sydney so you can hit your target finish time.

Enter a target time and calculate to see your splits here.

Marathon pacing that accounts for the course

Even splits are easy to calculate, but marathon courses rarely ask for even effort. Marathon Splits uses available GPX elevation data to shape a pacing plan around climbs, descents, and flat sections while still matching your target finish time.

Choose an even, negative, or positive split strategy, upload your own GPX file, or start with a supported race course to generate a shareable plan.

Supported marathon pace calculators

🇺🇸 Boston MarathonMajorBoston, MA - Point-to-point from Hopkinton to Boylston, with fast early downhills before the Newton Hills and Heartbreak 🇺🇸 New York City MarathonMajorNew York, NY - Five-borough route from Staten Island to Central Park, with bridge climbs shaping the rhythm from the Verrazzano onward 🇺🇸 Chicago MarathonMajorChicago, IL - Flat, fast Grant Park loop through 29 Chicago neighborhoods, built for steady pacing and loud crowd sections 🇬🇧 London MarathonMajorLondon, UK - Mostly flat route from Greenwich to The Mall, passing Cutty Sark, Tower Bridge, the Embankment, and Buckingham Palace 🇩🇪 Berlin MarathonMajorBerlin, Germany - Berlin’s record-hunting course: very little elevation, long straight sections, and the final push through the Brandenburg Gate 🇯🇵 Tokyo MarathonMajorTokyo, Japan - Fast city course from the Tokyo Metropolitan Government Building to Tokyo Station, linking Shinjuku, Nihombashi, Asakusa, and Ginza 🇦🇺 Sydney MarathonMajorSydney, Australia - Scenic harbour course over the Sydney Harbour Bridge, through the city, and into an Opera House Forecourt finish 🇨🇦 Ottawa International MarathonOttawa, ON - Scenic capital course, mostly flat 🇨🇦 Toronto Waterfront MarathonToronto, ON - Flat lakeshore course, fast and certified 🇺🇸 Buffalo MarathonBuffalo, NY - Flat urban course through downtown Buffalo and Delaware Park 🇨🇦 Vancouver MarathonVancouver, BC - Scenic seawall and neighbourhoods, some rolling hills 🇨🇦 Calgary MarathonCalgary, AB - Flat river valley course through Calgary neighbourhoods 🇸🇪 Stockholm MarathonStockholm, Sweden - Urban course through central Stockholm