Running Pace Calculator
Enter a distance and a time to calculate your average pace (min/km), your average speed (km/h), and get an estimate of your times on classic race distances.
What is running pace used for?
Pace is the go-to metric for runners. Expressed in minutes per kilometer (min/km), it shows how long it takes to cover one kilometer at a given effort. Unlike speed in km/h, which feels more natural for cars or cycling, pace is what runners use instinctively to plan training sessions, aim for a race time goal, or compare performance between two workouts. Knowing your pace also helps you spread your effort evenly across a distance and avoid starting too fast, a common mistake that often leads to hitting the wall late in a race.
Pace vs speed: what's the difference?
Both measures describe the same effort from a different angle. Speed (km/h) tells you the distance covered in one hour: the higher it is, the faster you're going. Pace (min/km) is the inverse, the time needed to cover a fixed distance: the lower it is (say 4:30 min/km rather than 6:00 min/km), the faster you're running. Runners favor pace because it maps directly to split times: "I want to run my 10K at 5:00 min/km" is more intuitive than "I want to run at 12 km/h," even though the two are mathematically equivalent. This tool calculates both automatically from the same inputs.
How to use this tool to plan a race goal
Enter the distance you've covered (or plan to cover) along with the corresponding time, in hours, minutes, and seconds. The tool instantly calculates your average pace and average speed, then extrapolates that rhythm across four reference distances: 5K, 10K, half marathon (21.097 km), and marathon (42.195 km). This gives you a sense of the time you could target on those distances if you held the same pace. It's especially useful for setting a realistic race goal, comparing a time achieved on one distance against a target on another, or tracking your training progress week over week.
Frequently asked questions
How can I improve my pace?
Progress usually comes from varied training: easy-paced runs to build base endurance, interval sessions (short, fast repeats) to improve speed and VO2 max, and long runs at a moderate pace to get your body used to sustained effort. Consistency is the biggest factor: improving your pace is built over several weeks, not in a single run.
Are the predicted times for other distances reliable?
They remain linear estimates: the tool assumes you'll hold exactly the same pace across the entire new distance, without accounting for the extra fatigue that comes with a longer effort. In practice, the pace you can sustain over a marathon is almost always slower than the one you can sustain over a 10K, since endurance and energy management become bigger factors as distance increases. These predictions give a useful ballpark for setting a goal, but they don't replace the experience gained through training on the actual target distance.
What's the difference between race pace and training pace?
Race pace is the rhythm you aim for or achieve on competition day, usually faster and harder to sustain for long. Training pace, especially during long or easy runs, is deliberately slower to build endurance without accumulating too much fatigue. Using this tool after each run lets you track how both paces evolve separately over time.