Skip to content
All tools

Pace and race times

One division for the pace, and one exponent for the prediction. The predictions reaching well past what you have actually raced are marked as such.

The run you did

How far you actually ran, not what the race was called.

Minutes and seconds, like 25:00, or 1:55:00 once you are over an hour.

2 still to fill in

Your pace

Fill in the boxes and press Calculate. Nothing is worked out until you ask for it.

  • Distance
  • Time

Nothing is sent anywhere. The sum happens in this tab.

What a time at one distance predicts at another, and why it is not proportional what a 25:00 5k predicts 5k 25:00 10k 52:07 half marathon 1:55:00 marathon 3:59:47 The dash is where holding 5k pace the whole way would land you. The exponent is 1.06, not 1. Nobody holds 5k pace for a marathon.
Doubling the distance costs more than double the time. The dashes are where simply holding the pace would land.
Read how this is worked out