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Running Pace Calculator: Pace, Time and Race Predictions

This free running pace calculator works out your pace per kilometre and per mile from a distance and a time. It also predicts your times for 5K, 10K, half marathon and marathon using the Riegel formula.

By Debmedia Technologies LLP · Kolkata, India · Updated

What Is It and When Do You Need It?

Pace tells you how long each kilometre or mile takes. Runners use it to set training speeds, judge races and plan splits. Speed in km/h is easier to understand, but pace is the number that watches and plans use.

Enter a distance and a time, and the tool gives your pace, your speed and likely times at other distances.

How to Use This Tool

  1. Enter the distance and choose kilometres or miles.
  2. Enter the time as h:mm:ss or mm:ss.
  3. Press Calculate.
  4. Read the pace and the race predictions.

How the Calculation Works

Pace per km = total seconds ÷ distance in km. Speed = distance ÷ hours. Race predictions use Riegel’s formula T2 = T1 × (D2 ÷ D1)^1.06, which accounts for the way pace slows over longer distances.

Worked Example

Running 10 km in 52:30 is a pace of 5:15 per km (8:27 per mile) and a speed of 11.43 km/h. The predicted 5K is about 25:11, the half marathon about 1:55:50 and the marathon about 4:01:31.

Common Uses

  • Training plans.
  • Race pacing.
  • Setting goals.
  • Comparing runs.

Tips and Common Mistakes

  • Predictions assume you train for the longer distance.
  • Add heat, hills and nerves for a real race.
  • Use even pacing for best results.

Next, you may need the time duration calculator, speed converter, BMR and TDEE calculator, one rep max calculator.

Everything runs in your browser. Nothing you type is uploaded, stored or sent to any outside service.

Frequently Asked Questions

Pace is time divided by distance. Running 10 km in 52 minutes 30 seconds is a pace of 5 minutes 15 seconds per kilometre.
With the Riegel formula: new time = old time × (new distance ÷ old distance)^1.06. It works best between 5K and the marathon, if you are trained for the longer distance.
It depends on age, fitness and goals. Recreational runners often run 5 to 7 minutes per kilometre.
Yes. Choose miles, and the tool shows pace in both units.

Disclaimer: results are calculated in your browser from the numbers you enter. Check important results before you rely on them for money, health, safety or legal decisions.