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Running Pace Calculator — Pace, Speed & Race Time Predictor

km
HMS
Pace
2:30
per km
Speed
24.0
km/h

Race Equivalents

1K
2:30
5K
12:30
10K
25:00
Half
52:45
Full
1:45:29
Split Times
kmTime
12:30
25:00
37:30
410:00
512:30
615:00
717:30
820:00
922:30
1025:00
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Know Your Numbers, Run Smarter

Whether you're training for your first 5K or chasing a marathon PR, knowing your pace is essential. Enter your distance and time, and this calculator instantly shows your pace, speed, predicted race times, and per-km or per-mile splits.

What You Can Calculate

  • Pace: Time per kilometer or mile — the runner's key metric.
  • Speed: Kilometers or miles per hour for treadmill or cycling comparison.
  • Race Equivalents: See predicted finish times for 1K, 5K, 10K, Half Marathon, and Full Marathon at your current pace.
  • Split Times: Plan your race with cumulative times at every km or mile marker.

Popular Race Distances

  • 5K (3.1 mi): The most popular race distance worldwide. Great for beginners.
  • 10K (6.2 mi): A step up that requires consistent training.
  • Half Marathon (21.1 km): A serious endurance challenge and gateway to the full marathon.
  • Marathon (42.195 km): The ultimate distance running goal for many runners.

Frequently Asked Questions

How is pace different from speed?
Pace is the time it takes to cover a unit of distance (e.g., 5:30 per km), while speed is the distance covered per unit of time (e.g., 10.9 km/h). Runners typically think in pace because it maps directly to how splits feel during a race.
How are race equivalents calculated?
Race equivalents assume you maintain the same average pace across all distances. In reality, pace slows at longer distances due to fatigue. The calculator gives a baseline estimate — your actual marathon time will likely be slower than a pure pace extrapolation from a 5K time.
What does the splits section show?
Splits show your cumulative time at each kilometer (or mile) marker, assuming perfectly even pacing throughout the race. This helps you plan how to pace yourself during a race and set goals for each segment.
Can I enter a custom distance?
Yes. Use the custom input field next to the distance presets to enter any distance in kilometers or miles. The calculator works for any distance you choose.
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