Know your splits before race day
Free pace calculator and race planner. Pick your course, enter a goal time, and get mile-by-mile splits that account for the actual hills, weather, and fatigue. Print a pace band or share your plan.
What you get
All free. No account needed to use the calculator or plan a race.
Pace Calculator & VDOT
Plug in a recent race and get your VDOT, training zones, and predicted times for other distances. Converts pace, speed, and finish time.
35+ Real Course Plans
Mile-by-mile splits for Boston, NYC, Chicago, and 30+ other courses. Actual GPX data, actual elevation. Not some flat-course estimate.
Weather in Your Splits
The forecast gets baked into your pacing. A 75°F start with high humidity changes your mile 20 pace more than most people think.
Pace Band & Sharing
Print a wrist band with your splits for race morning. Or share your plan as a link so your crew knows where to find you.
Popular Courses
The World Marathon Majors and 30+ more courses with real elevation data.
Boston Marathon
Point-to-point with Newton hills and a net downhill that wrecks your quads. Our model accounts for all of it.
Plan this race →NYC Marathon
Five bridges, constant rolling hills. Harder than people expect. Good course to plan carefully.
Plan this race →Chicago Marathon
Flat and fast. If you're chasing a PR, this is the one. 6 feet of elevation gain per mile.
Plan this race →London Marathon
Mostly flat with a few overpasses. April weather can swing 20 degrees, so the forecast matters.
Plan this race →Berlin Marathon
Where world records happen. Dead flat loop through the city. Finish at the Brandenburg Gate.
Plan this race →Tokyo Marathon
Flat, well-organized, and usually cool weather. One of the easier Majors to pace well.
Plan this race →How it works
Pick a course, set a goal
Choose from 35+ real courses. Enter your goal finish time.
See what race day actually looks like
Get splits adjusted for the hills, the weather, the fatigue, and the crowds at mile 1.
Take it with you
Print a pace band for your wrist or send your plan to whoever's tracking you.
Go plan your race
BQ attempt, first half, hundredth marathon. Same tool. Pick a course and see what race day looks like.