Calculate pace, speed, and race finish time predictions
h
min
sec
Pace/km
5:00
min/km
Pace/mile
8:03
min/mi
Speed
12.0
km/h
Speed
7.5
mph
Race Finish Time Predictions
5K
25:00
10K
50:00
Half Marathon
1:45:29
Marathon
3:30:59
What is a Running Pace Calculator?
A running pace calculator turns a distance and a time into your pace per kilometer, your pace per mile, and your speed in km/h and mph, all at once. From an easy jog to a full marathon, it lets you see your effort as a number and work backward from a goal time to the pace you need to hold. Runners in many countries think in minutes per mile, while metric regions use minutes per kilometer; this tool shows both so you can compare with races and training plans anywhere in the world. Whether you are chasing a sub-4-hour marathon or a personal best in the 5K, it is a starting point for learning the pace you must sustain in training.
How to Use
1. Enter the distance you ran (or plan to run) in kilometers.
2. Enter the time it took (or your goal time) in minutes.
3. Calculate to see your pace per kilometer, pace per mile, and speed.
4. To find the pace needed for a goal, enter your target distance and target time to work it out in reverse.
Formula & Definition
Pace and speed are found with:
Pace (min/km) = time (min) / distance (km)
Pace (min/mile) = pace (min/km) x 1.60934
Speed (km/h) = distance (km) / (time (min) / 60)
For example, running 10 km in 50 minutes gives a pace of 5.0 min/km (5:00 per km) and a speed of 12 km/h. Because one mile is about 1.609 km, the min/mile figure is larger than the min/km figure. To break 4 hours in a marathon (42.195 km) you need to hold roughly 5:41 per km.
Interpreting Results
A smaller pace number means you are faster, so 5:00 per km is quicker than 6:00 per km. Note that the decimal part of a 'min/km' figure is a fraction of a minute, not seconds: 5.5 min/km means 5:30 per km. When setting a race pace, leave a margin below the effort you can comfortably hold in training, because going out too fast early almost always causes a fade later. Heat, humidity, altitude, and hilly courses all change your real pace, so use these numbers as a planning guide and adjust to how you feel and the conditions on the day.
Frequently Asked Questions
What is the difference between min/km and min/mile? ▾
A mile is about 1.609 km, so the min/mile figure is larger than min/km for the same run. This tool shows both so you can compare with international standards.
Does 5.5 min/km mean 5 minutes 30 seconds? ▾
Yes. The figure is a decimal minute, so 0.5 min = 30 seconds. Read 0.25 as 15 seconds and 0.75 as 45 seconds.
Can I find the pace needed for a goal time? ▾
Yes. Enter your target distance and target time, and the tool gives the per-kilometer pace you must hold to achieve it.
Will I hit the time if I run exactly this pace? ▾
It is the theoretical average pace. Real results vary with wind, heat, hills, and how you feel, so start a little conservatively and distribute your effort.
Pace and goal times are estimates. Increasing intensity too quickly can cause injury or illness. If you have a health condition or are new to exercise, build up gradually and consult a doctor or coach if needed.