Running Pace Calculator

What is running pace

Running pace is the time it takes to run 1 kilometer, expressed in minutes and seconds (e.g., 5:30 min/km). It's the main metric runners use, more convenient than speed (km/h) for planning training and races.

Three ways to use this calculator

• Calculate finish time: knowing the race distance and your usual pace, find your estimated finish time.
• Calculate pace: if you have a target time for a distance, find out what pace you need to run.
• Calculate distance: knowing your pace and running time, find the approximate distance covered.

Predictions for standard distances

The calculator also shows estimated times for popular race distances (5K, 10K, half marathon 21.1K, marathon 42.195K) based on your entered pace. This is useful for planning goals for upcoming races.

How to use pace in your training

• Easy run (recovery): pace 60-90 seconds slower than 10K race pace — conversational pace, comfortable breathing.
• Tempo run: pace slightly slower than 10K race pace, sustained for 20-40 minutes continuously.
• Speed intervals: pace faster than 5K race pace, short segments with rest in between.
• Long run: pace 60-120 seconds slower than marathon pace, for building endurance.

Why pace differs across distances

On short distances (5K), you can run significantly faster because the body draws more on anaerobic energy over a short period. On long distances (marathon), pace slows down because you need to conserve glycogen and avoid premature fatigue. A typical rule of thumb: marathon pace is usually 45-75 seconds slower per km than 10K pace, depending on fitness level.

These predictions are estimates — over longer distances, pace typically slows down due to accumulated fatigue, so your actual marathon finish time may be somewhat higher than a simple extrapolation from a shorter run's pace.