Running Pace Calculator

Pace and speed are two ways of measuring the same thing. Speed tells you how far you go per hour. Pace tells you how long each kilometer (or mile) takes. Runners tend to think in pace because it maps directly to training zones and race strategy: your target race pace, your easy run pace, and your interval pace are all expressed in minutes per unit. Knowing your pace unlocks a lot of useful planning. If you run 5 km in 28 minutes, your pace is 5:36 per km. Multiply that pace by 42.195 km and you get a marathon estimate of around 3 hours 57 minutes. That is a rough projection assuming constant effort, but it gives you a starting point for goal-setting and race planning. This calculator works in both kilometers and miles. It shows your pace, your equivalent speed in km/h, and projected finish times for the four most common race distances.

• Setting a race goal: If you want to run a sub-2-hour half marathon, you need a pace under 5:41/km. Enter 21.1 km and 120 minutes to confirm, then use that target pace to structure your training runs.
• Tracking training progress: Log your regular 5 km time each week and enter it here. Watching the pace number drop over months gives you concrete evidence of fitness improvements that a raw time does not convey as clearly.
• Comparing runs on different distances: A 30-minute 5 km and a 65-minute 10 km are at different paces. Entering both lets you see whether your fitness held up over the longer effort or whether you started too fast.
• Planning a long run: If you have two hours for a long run and want to finish comfortably, enter your easy-effort pace and 120 minutes to find out how far you will go. Or enter a target distance and time to confirm the required pace is within your current ability.

• Entering distance in one unit but expecting the other: If you run 5 miles but enter 5 in km mode, the pace will be off by a factor of 1.6. Double-check the unit selector before reading the result.
• Assuming race estimates are exact: The projected finish times assume you hold exactly the same pace for the full race distance. In practice, fatigue, terrain, and weather affect longer distances. Use the projection as a planning benchmark, not a guaranteed result.
• Confusing pace with speed: A lower pace number is faster (5:00/km is faster than 6:00/km). A higher speed number is faster (12 km/h is faster than 10 km/h). They move in opposite directions, which causes confusion when comparing runs.
• Using a GPS-rounded distance: GPS watches can under- or over-measure distance by 1-3% depending on signal quality. A measured track (400 m) or a certified road course gives a more accurate distance for calculating pace.

1. 1Enter the distance you ran and the time it took in minutes.
2. 2Select whether your distance is in kilometers or miles.
3. 3The calculator divides time by distance to get your pace in minutes per unit.
4. 4It formats the pace as MM:SS (for example, 5:30 means 5 minutes and 30 seconds per kilometer).
5. 5It calculates your speed in km/h by converting the time to hours and dividing.
6. 6It multiplies your pace by each race distance to show estimated finish times for the 5K, 10K, half marathon, and marathon.

• Use easy-run pace to build aerobic base: Most distance runners do 80% of their weekly mileage at easy pace (about 60-70% of max heart rate). Enter a recent easy run to see what that pace is, then use it as a ceiling for most of your training.
• Add 10-20 seconds per km for unfamiliar terrain: Trail runs, hilly courses, and windy conditions slow your effective pace without feeling slower. When projecting a race finish time on a hilly course, add 10-20 seconds to your flat-ground pace per km.
• Check your long-run pace against your race pace: A healthy long-run pace is typically 45-90 seconds slower per km than your 10K race pace. If the gap is smaller, you may be running long runs too fast and not recovering fully between sessions.
• Convert your treadmill speed to outdoor pace: Treadmills display speed in km/h (or mph). Enter that speed equivalent into this calculator as distance=speed and time=60 minutes to find the corresponding pace per km. A 10 km/h treadmill setting equals a 6:00/km pace.