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Pace Calculator

Whether you are training for your first 5K or chasing a marathon personal best, knowing your pace is essential. This calculator converts between distance, time, and pace in both miles and kilometers, and predicts your finish times for popular race distances based on your current pace.

Quick Answer

Running pace is your time per mile or kilometer. A 30-minute 5K is roughly a 9:39/mi (6:00/km) pace.

These results are estimates based on general formulas and are not a substitute for professional medical advice. Consult a healthcare provider before making health decisions.

Time

Enter your distance and time above to calculate your pace.

How the Formula Works

  1. Calculate total time in seconds from hours, minutes, and seconds.

    totalSeconds = hours × 3600 + minutes × 60 + seconds

  2. Divide total seconds by distance to get pace per unit.

    pace (sec/unit) = totalSeconds ÷ distance

  3. Convert pace between miles and kilometers using the conversion factor.

    1 mile = 1.60934 km

  4. Calculate speed by dividing distance by time in hours.

    speed = distance ÷ (totalSeconds ÷ 3600)

  5. Predict race times by multiplying pace per km by each race distance.

    prediction = pace (sec/km) × race distance (km)

Limitations

  • Race predictions assume a constant pace throughout the entire distance, which is unlikely in real-world conditions.
  • Terrain, weather, elevation, and fatigue are not accounted for in these calculations.
  • Predictions become less accurate for distances significantly longer or shorter than your training runs.
  • Individual fitness, running economy, and race-day conditions all affect actual performance.

Frequently Asked Questions

What is running pace and how is it different from speed?
Pace is the time it takes to cover one unit of distance (e.g., minutes per mile), while speed is the distance covered per unit of time (e.g., miles per hour). Runners typically use pace because it directly relates to how long a run will take.
How can I use pace to plan my training zones?
Many training plans define easy, tempo, threshold, and interval paces. Once you know your current race pace, you can calculate training zones: easy runs are typically 60-90 seconds per mile slower than race pace, while tempo runs are 15-30 seconds per mile slower.
How accurate are the race predictions?
The predictions assume you can hold a constant pace for the full distance. They are most accurate when based on a recent race effort at a similar distance. For much longer distances, real-world times are usually slower due to fatigue.
Should I train using pace per mile or pace per kilometer?
Use whichever unit matches your local race distances and training routes. In the United States, pace per mile is standard. In most other countries, pace per kilometer is more common. This calculator provides both so you can train with either.
What is a good running pace for beginners?
A comfortable beginner pace is typically between 10:00 and 13:00 per mile (6:12 to 8:04 per km). The best pace is one where you can hold a conversation while running. As fitness improves, your pace will naturally decrease.

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