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Race Splits Calculator

Plan even race splits from your distance and target finish time.

How it is calculated

The tool plans an even-paced race from three numbers: distance d, total time T in decimal minutes, and the split length s in the same distance unit as d. Pace per unit is T / d, time per split is (T / d) × s, and the number of splits is d / s rounded up. Average speed is d / (T / 60). Times are rounded to the nearest second and shown as m:ss. If the split length is empty or zero, 1 is used; a split longer than the race is cut down to the race distance. Distance and time must be above zero, and a combination faster than 120 distance units per hour shows no result. The tool does not know whether d is in kilometres or miles, but it always labels the speed "km/h", so with miles read it as mph. The total time must be typed in minutes, not as h:mm:ss. When the distance is not a multiple of the split, the last split is shorter than the time shown.

Worked example

A half marathon of 21.0975 km in 105 minutes, with a split every 5 km. Pace: 105 / 21.0975 = 4.977 min per km, which is 298.6 seconds, shown as 4:59. Time per 5 km split: 4.977 × 5 = 24.88 min, shown as 24:53. Number of splits: 21.0975 / 5 = 4.22, rounded up to 5, the last one being only about 1.1 km long. Speed: 21.0975 / (105 / 60) = 12.06. The tool shows a pace of 4:59, a split time of 24:53, 5 splits and 12.06 km/h.

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Common mistakes

  • Typing the finish time as hours and minutes. The field is decimal minutes: 1 h 45 min is 105, and 1:45 typed as 1.45 means 1.45 minutes.
  • Entering decimal minutes for seconds, such as 52.30 for 52 min 30 s. Half a minute is 0.5, so that time is 52.5.
  • Using miles for the distance and reading the speed as km/h. The unit is not converted: the speed figure is in whatever distance unit you used per hour.
  • Choosing a split longer than the race and expecting more than one split. It is cut down to the race distance, so you get a single split equal to the whole race.
  • Expecting the last split to be a full one. When the distance is not a multiple of the split length, the final split is shorter, but the split time shown is for a full split.

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.

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