A toolkit for runners
Run the numbers.
Build the Run
Straightforward tools for training and race day, designed to make the numbers easier to use.
WORKSPACE
Running tools
Pace calculator
Find your pace, finish time or distance.
Split strategy
Plan even splits or a controlled negative split.
Race predictor
Estimate times across common race distances.
Miles ↔ kilometers
Convert distance and running pace in either direction.
Heart-rate zones
Five training zones from your age or max heart rate.
Training pace chart
Easy, tempo and interval paces from a recent race.
Treadmill pace and incline
Convert speed to pace and see what an incline is worth.
Fuel and hydration planner
A timed plan for carbs, fluid and sodium on long runs.
Running tool
Notes save in this browser on this device. Import adds the selected tool’s values and results here.