Pacing Calculator
Elevation-adjusted splits for your goal time, course, and conditions.
Course library
Every major, mapped metre by metre
Each course below is built from its official elevation data, not an approximation — every climb and descent is where the race actually puts it. More courses are being added as we map them.
Berlin
Berlin Marathon
Chicago
Chicago Marathon
London
London Marathon
Tokyo
Tokyo Marathon
Sydney
Sydney Marathon
New York
New York City Marathon
Boston
Boston Marathon
In progress
More marathons are being mapped and added.
Elevation
Splits shaped by the course, not a calculator's average
- Built from the official elevation profile — every climb and descent where the race actually puts it.
- Paces ease on the way up and pick up on the way down, so the effort stays level even though the ground doesn't.
- Your goal finish time never changes. Only the way you spend it does.
Weather
The forecast, already priced into your plan
- Heat, humidity and wind all change what a given pace costs you — and none of them settle until race week.
- We pull the hourly forecast for your start time and location, then layer it onto the elevation-adjusted plan.
- Heat that builds through the back half gets worked into your splits the same way a hill does.
22°C · 65% humidity
Goal
3:30:00
In the heat
3:37:18
Cost
+7 min
Same runner, same fitness, same course. The difference is the morning they got — and knowing it in advance is what stops it ambushing you at mile 18.
Race day
A band for your wrist, not a PDF for your phone
- Every split printed at true wrist scale, ready to fold and wear.
- Fueling cues marked on the rows where they land, so you're not doing arithmetic at mile 20.
- Print it yourself for free, or order one on waterproof stock.
Even effort. The finish you planned for.
Pick your race, set your goal time, and get splits that account for the course and the forecast. Free, and no account needed.
Build my pacing plan