Pace Calculator
Calculate running pace, speed, and projected finish times from distance and time.
About Pace Calculator
Pace is how long it takes to cover one unit of distance, the language most runners think in: 5:00 per kilometer, not 12 km/h. A pace calculator converts between time, distance, and speed, and projects finish times, which is exactly what runners plan their workouts and races around.
Pace = total time ÷ distance, expressed as minutes per unit. For 50 minutes over 10 km that is 5:00/km, equivalent to 12 km/h. The tool switches between kilometers and miles and projects common race distances, 5K, 10K, half, and full marathon, from the entered pace. It assumes a steady pace throughout, which real races rarely hold exactly.
Runners set training paces for interval and tempo workouts, marathoners plan target finish times and split strategies, and coaches assign pace ranges to their athletes. Walkers and hikers also use it to estimate trail times and plan how long a route will take at a comfortable pace.
How to Use
- Enter your distance and total time.
- Read your pace per km or mile.
- See projected times for common race distances.
Example
10 km in 50 minutes 5:00 per km · 12 km/h
50 minutes ÷ 10 km = 5 minutes per kilometer, equivalent to a 12 km/h average speed.
FAQ
How do I calculate pace manually?
Divide total time by distance. 50 min ÷ 10 km = 5 min/km, expressed as 5:00.
Which race distances are projected?
5K, 10K, half marathon, and full marathon, based on your current pace.
Does it support miles?
Yes, switch between kilometers and miles for pace per mile or per kilometer.
How do I convert pace to speed and back?
Speed = distance ÷ time in hours. A 5:00/km pace is 1 km in 5 minutes, so 60 ÷ 5 = 12 km/h. To go back to pace, divide 60 by the speed in km/h.
Why is my actual race pace usually slower than my training pace?
Courses, hills, weather, hydration, and race-day nerves all affect pace. Most runners should aim for a conservative target early and treat projected times as guidance, not guarantees, especially for longer distances.