Pace Calculator
Calculate running and walking pace per kilometer and mile, determine required race splits, and convert between speed and pace instantly.
About the Pace Calculator
The Pace Calculator is built for runners, joggers, triathletes, and walkers who want to plan training runs or predict race finishes. Pace measures the time required to cover a unit of distance (such as minutes per kilometer or minutes per mile), while speed measures distance covered per unit of time (km/h or mph).
The calculator supports standard race distances including 5K, 10K, Half Marathon (21.0975 km), and Full Marathon (42.195 km), allowing you to determine the target pace needed to achieve your personal best finish goal.
How to Calculate Pace
Enter your total course Distance and select the unit (km or miles).
Enter the elapsed or targeted Time (hours, minutes, and seconds).
Click Calculate to view your average pace per kilometer, pace per mile, and speed in km/h and mph.
Adjust times to forecast split requirements for upcoming running races.
Pace and Speed Formulas
Pace = Time (seconds) / Distance Speed (km/h) = Distance (km) / Time (hours) Speed (mph) = Distance (miles) / Time (hours)
Pace is the inverse of speed: divide total elapsed time in minutes by the total distance covered in kilometers or miles.
Variable Descriptions
- Time
- Total elapsed duration in hours, minutes, and seconds
- Distance
- Total course length in kilometers or miles
- Pace
- Time taken per unit distance (min/km or min/mi)
Worked Example
Important Considerations & Tips
- 1 mile equals approximately 1.60934 kilometers. 1 kilometer equals 0.621371 miles.
- Pace is formatted as MM:SS (e.g., 4:30 min/km means 4 minutes and 30 seconds).
- To convert pace to speed: Speed (km/h) = 60 ÷ Pace (in decimal minutes per km).
Frequently Asked Questions
What is the difference between pace and speed?
Speed indicates how far you travel in a given time (e.g., kilometers per hour), whereas pace indicates how much time it takes to travel a fixed distance (e.g., minutes per kilometer).
What pace is needed for a sub-4 hour marathon?
To finish a full marathon (42.195 km / 26.219 miles) under 4 hours, you need an average pace faster than 5:41 min/km or 9:09 min/mile.
How do I convert min/km to min/mile?
Multiply your pace in minutes per kilometer by 1.60934. For example, 5:00 min/km (5.0) × 1.60934 = 8.046 minutes per mile, which is approximately 8:03 min/mile.
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