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Running Pace Calculator

Enter a recent race time or your target pace to predict finish times across all standard distances. Works in minutes per mile (min/mi) or minutes per kilometre (min/km).

min/mi min/km

Calculate from

Distance

Finish time (HH:MM:SS)

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Your pace

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10K

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Half Marathon

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Marathon

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1 Mile

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Split / km

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Predictions use the Riegel formula (T2 = T1 × (D2/D1)^1.06), which accounts for fatigue at longer distances. Actual race performance depends on fitness, conditions, terrain, and training. Use these as orientation targets, not guarantees.

How to use this calculator

From a race time: Select the distance you ran, enter your finish time, and see predicted times for all standard distances.
From a target pace: Enter the pace you can sustain (e.g. from a recent training run) and see what race times it predicts.
Riegel formula: T2 = T1 × (D2/D1)^1.06 — adjusts for the physiological reality that pace slows predictably over longer distances.
The half marathon and marathon predictions assume a reasonably trained runner; elite athletes will outperform the formula at longer distances.