Pace Calculator
Calculate your running pace, speed and estimated times for 5K, 10K, half marathon and marathon distances.
Last updated: August 2026
How this calculator is verified
Checked by True Calculator automated test suite on
- Formula verified against a published worked example in the automated test suite
- Edge cases (zero, negative, boundary and unit-mismatch inputs) covered by unit tests
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When to Use This Calculator
Runners and walkers plan training around pace — minutes per kilometre — and this calculator converts between pace, speed and total time for any distance. If you want to finish a 10K in under 60 minutes, you need to hold about 5:59 per km; marathons and half-marathons use the same math for race pacing and for splitting a long run into segments. Enter distance and time to get your pace and speed, or enter pace and distance to get the finish time. Indian runners use it to plan race-day targets, set treadmill speeds from road paces, and compare intervals across different training routes. It works for walking too, which makes it handy for step challenges and walking-based fitness plans. Treadmill users can also convert speed to pace: running 9 km/h is a 6:40 per km pace.
How to Use This Calculator
- Step 1: Choose kilometres or miles as the distance unit.
- Step 2: Enter the distance covered, for example 5 for a 5 km run.
- Step 3: Enter the time taken in hours, minutes and seconds, such as 0 hours, 25 minutes and 0 seconds.
- Step 4: Calculate and read your pace per kilometre, your speed in kilometres per hour and the projected time for your distance.
Worked Example
A runner finishes a 5 km route in 25 minutes and wants the pace. Enter 5 as the distance and 25 as the minutes; the calculator returns 5 minutes per kilometre, which is a speed of 12 km/h. The same pace projected to a 10 km race gives 50 minutes, and to a half marathon it gives about 1 hour 45 minutes, since 21.1 km at 5:00 per km is 105.5 minutes. If the target is a 60-minute 10 km instead, enter that time and read the 6:00 per km pace to hold in training.
Tips and Common Mistakes
- •Tip 1: Use the projected race times to set realistic targets, then train at a pace slightly slower than race pace on long runs.
- •Tip 2: In Indian summer heat, plan for a slower pace than the calculator suggests, since heat raises heart rate at the same speed.
- •Tip 3: Use the reverse mode, entering a target time for a race distance, to get the pace to practise on training runs.
- ✗Mistake 1: Mixing units, such as entering a distance in kilometres while reading the pace per mile, or the reverse.
- ✗Mistake 2: Entering minutes in the hours field, since a 25-minute run typed as 25 hours destroys the pace calculation.
Frequently Asked Questions
How is running pace calculated?
Pace is time divided by distance. Finishing 5 km in 25 minutes gives 5 minutes per kilometre, which is also a speed of 12 km/h. The calculator returns pace per km, speed, and projected times for your chosen race distance.
What is a good pace for a beginner?
There is no single right pace — it depends on your age, fitness and training history. A comfortable conversational effort is usually around 6:30 to 8:00 per kilometre for new runners, and most plans suggest building a weekly base at that easy pace.
How do I project a race time from my pace?
Multiply the race distance by your pace. A 5:00 per km pace gives 50 minutes for a 10 km and about 1 hour 45 minutes for a half marathon, since 21.1 km × 5 minutes is 105.5 minutes.
Why should I run slower in the Indian summer heat?
Heat raises your heart rate at the same speed, so an easy pace in the morning can feel like a tempo effort by midday. Many runners in India add 15–30 seconds per kilometre during peak summer and train in the early morning or after sunset.
What is the difference between pace and speed?
Pace is time per unit distance, usually minutes per kilometre, while speed is distance per unit time, such as km/h. A 5:00 min/km pace equals 12 km/h — the calculator shows both, since runners tend to think in pace and cyclists in speed.
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