Pace/Time Calculator

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Enter distance and time or pace, to calculate the pace or time, respectively.

Distances can be entered as e.g. "5k", "1mi", "Marathon", "Half Marathon", or simply "1000m" or "2.5km".

Time and pace can be entered as e.g. "30m", "7m30s", "4h30m", or (HH:)MM:SS.

Pace Converter

min/km
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min/mi
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km/h
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mph

Convert pace/speeds between minutes per kilometer, minutes per mile, kilometers per hour and miles per hour.

Distance Converter

km
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mi

Convert distances between kilometers and miles.

Race Time Predictor

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By entering a known race time, you can predict your race time at another distance, using a formula proposed by research engineer Peter Riegel in Runner's World in 1977. It is only recommended for races lasting between 3:30 minutes to 3:50 hours.

Distances can be entered as e.g. "5k", "1mi", "Marathon", "Half Marathon", or simply "1000m" or "2.5km".

Time can be entered as e.g. "30m", "7m30s", "4h30m", or (HH:)MM:SS.

Split Times Calculator

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Enter distance and time to calculate split times. Select a pacing strategy, positive or negative splits.

Distances can be entered as e.g. "5k", "1mi", "Marathon", "Half Marathon", or simply "1000m" or "2.5km".

Time can be entered as e.g. "30m", "7m30s", "4h30m", or (HH:)MM:SS.

Distance Split Time Split Pace