Enter any two of three variables — finish time, distance, or pace per mile/km — and your Pace Calculator solves for the missing one. Planning a 5K, half marathon, or full marathon? Set your target race time and distance to get your required pace, or enter your pace and distance to predict your finish time.
Your Result
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Pace per Mile
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Pace per Kilometer
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Finish Time
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Total Distance
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Speed (mph)
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Speed (km/h)
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The calculator uses the relationship: Pace = Time ÷ Distance. Enter any two of the three variables — time, distance, or pace — and the calculator solves for the missing one. Select 'Calculate' at the top to choose which value you want to find.
To finish a marathon (26.219 miles) in under 4 hours, you need to maintain a pace faster than 9 minutes 9 seconds per mile, or approximately 5 minutes 41 seconds per kilometer. Set 'Calculate' to Pace, enter 4:00:00 for time and 26.219 for distance to verify.
Most beginner runners fall in the range of 10 to 14 minutes per mile (6:15 to 8:42 per km). A sustainable conversational pace — where you can speak a full sentence while running — is the best guide regardless of exact pace numbers.
Pace is expressed as time per unit of distance (e.g. 9 min/mile), while speed is expressed as distance per unit of time (e.g. 6.7 mph). Runners typically use pace, while cyclists and vehicle-based activities use speed. This calculator displays both.
To convert a per-mile pace to per-kilometer, divide by 1.60934. For example, a 10:00/mile pace equals approximately 6:13/km. Toggle the Distance Unit selector in this calculator between Miles and Kilometers to see both values side by side.
A negative split means running the second half of a race faster than the first. It is widely considered the most efficient pacing strategy for distance running, as it conserves energy early and allows a strong finish. Use this calculator to plan your split targets by comparing half-distance times.
Yes. The core formula — Pace = Time ÷ Distance — applies to any constant-effort activity. Simply enter the appropriate distance and time for walking, cycling, or indoor rowing and the calculator will return the correct pace or speed.
Heart rate zones help runners train at the right intensity for their goals. Generally, an easy aerobic pace sits at 60–70% of maximum heart rate, tempo runs at 80–90%, and race pace at 85–95%. Pairing pace data from this calculator with heart rate zones helps optimize training load.