Running Pace Calculator
What Is Pace, and Why Does It Matter?
Pace is the amount of time it takes to cover a fixed unit of distance — usually expressed as minutes and seconds per kilometer or per mile. It is the inverse of speed: a faster runner has a lower pace number (less time per unit distance), while a slower runner has a higher pace number.
Pace is more useful than speed for most runners because race distances and training runs are measured in distance, not time. Knowing your pace lets you predict a finish time before you start, hit even splits during a race, and set training paces that target specific physiological adaptations rather than just running by feel.
How This Calculator Works
Choose What to Solve For
Pick pace, finish time, or distance depending on which two values you already know.
Enter Your Known Values
Distance in km or miles, time in hours/minutes/seconds, or pace per km/mile.
Get Your Result
The calculator solves Pace = Time ÷ Distance, and derives speed, splits, and a position on the pace spectrum.
Explore the Extras
See mile-by-mile or km-by-km splits, predicted times at other race distances, and estimated training pace zones.
Pace Conversion Reference Table
Use this table to quickly cross-reference common training and race paces between minutes per kilometer, minutes per mile, kilometers per hour, and miles per hour.
| Pace /km | Pace /mi | km/h | mph |
|---|---|---|---|
| 3:00 | 4:50 | 20.0 | 12.4 |
| 3:30 | 5:38 | 17.1 | 10.6 |
| 4:00 | 6:26 | 15.0 | 9.3 |
| 4:30 | 7:14 | 13.3 | 8.3 |
| 5:00 | 8:03 | 12.0 | 7.5 |
| 5:30 | 8:51 | 10.9 | 6.8 |
| 6:00 | 9:39 | 10.0 | 6.2 |
| 6:30 | 10:27 | 9.2 | 5.7 |
| 7:00 | 11:16 | 8.6 | 5.3 |
| 8:00 | 12:52 | 7.5 | 4.7 |
Understanding Your Training Pace Zones
The training zones this calculator estimates are loosely based on the practical zone system popularized by exercise physiologist Jack Daniels, adjusted from whatever pace you enter. Each zone targets a different physiological adaptation.
These zones are estimates, not lab values. True threshold and VO2max paces are determined through lactate testing or a graded exercise test. The multipliers used here are practical approximations drawn from published training-intensity research and are meant as a starting point for structuring workouts, not a substitute for individualized testing.
How to Use Splits and Race Predictions Effectively
Frequently Asked Questions
How do I calculate my running pace?
Divide your total time by your total distance. For example, running 5 kilometers in 25 minutes gives a pace of 5 minutes per kilometer (25 ÷ 5). To convert to pace per mile, multiply the pace per kilometer by 1.60934, since one mile equals 1.60934 kilometers.
What is a good running pace for a beginner?
There is no single "good" pace — it depends on age, fitness level, and goals. Many new runners comfortably run somewhere between 6:00 and 8:00 per kilometer (roughly 9:40 to 12:50 per mile) and steadily improve with consistent training. The most useful benchmark is your own pace from a month or a year ago, not a generic target.
How accurate are race time predictions from a shorter distance?
The Riegel formula, which this calculator uses, was well calibrated for predicting race times up to the half marathon in a large study of recreational runners, but it tended to predict marathon times that were too fast for about half of runners. Treat marathon predictions from shorter races as an optimistic estimate that assumes solid endurance-specific training, not a guarantee.
What is the difference between pace and speed?
Pace is time per unit of distance (minutes per kilometer or mile) — a lower number means faster. Speed is distance per unit of time (kilometers or miles per hour) — a higher number means faster. They describe the same effort from opposite directions and can always be converted into each other.
How are training pace zones calculated here?
The zones are estimated as percentage offsets from the pace you enter, following the practical zone structure described in Jack Daniels' Running Formula and supported by broader research on training intensity distribution. Because they are not derived from a lactate or VO2max test, treat them as a reasonable starting point rather than an exact physiological measurement.
