Fitness & SportsRunning
Running Pace, Speed & Marathon Split Calculator
Calculate your running pace per kilometer or mile from any distance and time. Computes speed (km/h & mph) and predicts race split times.
Race Distance & Target Time
Hours
Minutes
Seconds
Target Pace per Kilometer
5:34 /km
Imperial Equivalent: 8:58 /mile
Running Speed (Metric):10.77 km/h
Running Speed (Imperial):6.69 mph
Mathematical Formula: Pace & Velocity Relations
Pace = Time / Distance | Speed = Distance / Time
Converts between distance intervals, elapsed split time, and velocity.
How to Use This Calculator
- 1Choose a race preset (5K, 10K, Half Marathon 21.1 km, Full Marathon 42.2 km) or enter custom distance.
- 2Enter your goal or actual finish time in hours, minutes, and seconds.
- 3See your required pace per kilometer, pace per mile, and speed in km/h and mph.
Practical Example: Sub-4 Hour Marathon Goal
Scenario: Full Marathon (42.195 km) in 3 hours 55 minutes 00 seconds.
Distance:42.195 km
Time:3h 55m 00s
Result: Pace: 5:34 min/km (8:58 min/mile) | Speed: 10.77 km/h (6.69 mph)
Maintaining a 5:34 per km pace consistently brings you across the marathon finish line in 3:55:00.
Frequently Asked Questions
Speed in km/h = 60 divided by pace in minutes per km. For example, a 6 min/km pace equals 60 ÷ 6 = 10 km/h.
Pro Calculation Tips
- Practice pacing negative splits (running the second half of your race slightly faster than the first) for personal records.
Model Assumptions
- Does not account for race course elevation, wind resistance, or temperature.