This pace calculator turns any run or walk into your pace per kilometre and per mile, your speed, and your predicted finish times for popular race distances. A stopwatch alone only tells you the total, and that total hides how evenly you actually moved. Pace, in contrast, shows the effort behind every single kilometre, so you can judge a run properly. This page explains the maths in plain words, and it then works through a full example you can check yourself.

How the Pace Calculator Works

Pace is simply your total time divided by your total distance. First, the tool converts your distance into both kilometres and miles, because runners use the two units side by side. Next, it divides your time by each distance, and it shows the results as minutes and seconds per kilometre and per mile. Then it works out your speed, which is the same effort read the other way round, in kilometres per hour and miles per hour. The pace calculator then turns that pace into predicted finish times for the 5K, the 10K, the half marathon (21.1 km) and the marathon (42.2 km). In other words, one steady training run gives you a sensible target for race day.

Pace Calculator Example: 10 Kilometres in 55 Minutes

Say you run 10 kilometres in exactly 55 minutes, a very common training run. First, divide the time by the distance: 55 minutes divided by 10 gives 5.5 minutes per kilometre, which is a pace of 5:30 per kilometre. Next, convert the distance to miles: 10 kilometres is about 6.21 miles, and 55 divided by 6.21 gives about 8.85 minutes, which is 8:51 per mile. Then find the speed: 10 kilometres in 55 minutes is 10 divided by 0.9167 hours, which gives 10.9 kilometres per hour (6.8 mph). Finally, multiply the per-kilometre pace by each race distance to predict the finish times. At this pace, the 5K takes 27:30, the 10K takes 55:00, the half marathon takes 1:56:03 and the marathon takes 3:52:06.

How to Use Your Pace in Training

Easy runs build fitness best at a pace where you can still hold a conversation. In fact, most of your weekly running should feel that comfortable, especially when you are building a base. Harder sessions, such as tempo runs and intervals, use faster paces for short stretches, and they teach your body to handle race effort. However, real races rarely run at one perfectly even pace, because hills, weather, crowds and tired legs all play a part. As a result, treat the predicted times as a guide for planning, not as a promise. Over time, retest the same route every few weeks, and watch your pace at the same effort slowly improve.

Frequently Asked Questions

What is a good pace for a beginner?

There is no single good pace, because fitness, age and terrain differ so much. Many beginners run between 6:30 and 8:00 per kilometre, and walking breaks are completely normal at first. Focus on a pace you can hold with steady breathing, and speed will follow.

Why do my predicted marathon time and my real result differ?

The predictions assume one even pace from start to finish. In a real marathon, most runners slow in the final kilometres, so their finish time lands later than the prediction. Train with some long runs at your target pace, and the gap will shrink.

Should I train by pace per kilometre or per mile?

Use whichever unit your races and your watch use, because consistency matters more than the unit itself. Enter any run into the pace calculator in kilometres or miles, and it shows both paces anyway.

Can I use this tool for walking?

Yes, the maths works in exactly the same way for walking. Enter your walking distance and time, and you will see your walking pace and speed. Many walkers use pace to check whether their daily walk reaches a brisk level.

How do I improve my pace safely?

Build distance first, and add one faster session per week only after your easy runs feel comfortable. Also, keep at least one full rest day each week, because fitness grows during recovery, not during the run itself.

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Sources

The pace conversion method on this page follows the Compendium of Physical Activities, the standard research reference for physical activity and movement, which sets out how speed converts into pace per mile and per kilometre. The race distances are the standard 5K, 10K, half marathon and marathon distances, with the half marathon counted as 21.1 km and the marathon as 42.2 km.