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Every runner eventually asks the same question after a race: what does that mean for the longer distances? The answer hides in your pace — the single most useful number in running. This calculator turns any timed distance into minutes per kilometre, then projects what even pacing at that speed predicts for the classic race distances, so you can plan a realistic goal for your next event instead of guessing.
Turn a distance and a finish time into your pace per kilometre — then see what that pace predicts for 5K, 10K, half and full marathon.
Divide your total time in seconds by the distance in kilometres. 56 minutes for 10 km, for example, is 5:36 per kilometre — the pace this calculator is built around.
They assume even pacing, which most runners fail at — especially over a marathon. Treat predictions as optimistic ceilings and add margin for the second half of longer races.
Roughly 60-90 seconds per kilometre slower than your race pace. Easy days should feel easy; that is what makes the hard days productive.
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