Race Splits Calculator

About this calculator

Race splits break a target finish time down into the pace needed for each segment of a race, so you can run it evenly rather than starting too fast and fading. From your total distance and target finish time, this calculator derives your required pace per unit (minutes per km or per mile), the time you should hit at each split point, the total number of splits, and your overall average speed.

Marathon and half-marathon runners rely on split charts like this to plan an even or slightly negative-split race (running the second half no slower than the first, a pacing strategy strongly associated with better outcomes), and running coaches build pacing bands for athletes ahead of race day so they have concrete checkpoints to hit rather than guessing effort by feel alone. Pacers at organized races are given printed split sheets built on exactly this math.

Enter your race distance and target finish time, and this calculator generates your pace, split times, and average speed.