Change Windows to 24-Hour Time Format

To switch Windows to a 24-hour clock, open Settings > Time & Language > Language & Region, click “Regional format,” then “Change formats,” and select “24-hour” under Short time and Long time. This changes the taskbar clock, lock screen, and calendar to military time, while leaving the underlying date and time data untouched.

Formula

The calculator works out your average pace and speed from a finish time and distance. Pace is the time taken per unit of distance, and speed is the distance covered per hour.

Pace (min/km) = Finish time (minutes) ÷ Distance (km)

Speed (km/h) = Distance (km) ÷ (Finish time (minutes) ÷ 60)

Variables:

• t – finish time in minutes (e.g., 50 min)
• d – distance in kilometers (e.g., 10 km)
• Pace – minutes per kilometer (min/km)
• Speed – kilometers per hour (km/h)

Worked Example

Using the default values: you run 10 km in 50 minutes.

1. Pace = 50 ÷ 10 = 5.00 min/km
2. Speed = 10 ÷ (50 ÷ 60) = 10 ÷ 0.8333 = 12.00 km/h

The calculator returns a pace of 5.00 min/km and a speed of 12.00 km/h.

Why Use This Calculator

Runners, cyclists, and walkers often want to know their average pace to plan training or compare performances. If you track a workout with a stopwatch and a known distance (e.g., a 5K or a treadmill session), this tool converts that raw data into the two standard metrics: pace and speed. Coaches use pace to set interval targets, while speed is useful for cycling or treadmill settings. The formula is straightforward, but doing it by hand for every session is tedious—this calculator gives instant results.

How to Read the Results

The first output, pace, is the headline answer. A lower pace means faster running (fewer minutes per kilometer). The second output, speed, is the inverse: higher speed means faster movement. For example, a pace of 5 min/km corresponds to 12 km/h. If you run a marathon (42.195 km) in 3 hours 30 minutes (210 minutes), your pace would be about 4:58 min/km and your speed about 12.06 km/h. Note that pace is usually expressed in minutes and seconds per kilometer, but this calculator shows decimal minutes (e.g., 5.00 min = 5 min 0 sec). To get seconds, multiply the decimal part by 60: 5.25 min = 5 min 15 sec.

Common Mistakes

• Mixing units: If your distance is in miles, convert to kilometers (1 mile = 1.60934 km) or use a miles-based calculator. The formula here assumes kilometers.
• Using hours instead of minutes: If you enter hours (e.g., 1.5 for 1 hour 30 min), the pace will be wrong. Convert to minutes first (1.5 h = 90 min).
• Rounding too early: For long distances, rounding the pace to one decimal can hide real differences. Keep two decimals for accuracy.
• Confusing pace and speed: Pace is time per distance, speed is distance per time. They are reciprocals (when using consistent units).

Limitations of the Formula

This formula assumes a constant pace throughout the activity. In real workouts, you may speed up or slow down, so the result is an average, not a split-by-split breakdown. It also ignores elevation changes, wind, and terrain, which affect actual effort. For intervals or hill repeats, you’d need a more detailed analysis. The formula is purely arithmetic and works for any distance and time, but it only gives you the average—not the story of how you got there.

Frequently Asked Questions

Can I use this for walking? Yes, the formula works for any activity where you cover a distance in a time. Walking pace is typically slower (e.g., 12 min/km), but the math is identical.

What if I know my speed but not my pace? You can invert the calculation: pace = 60 ÷ speed (in km/h). For example, 10 km/h gives a pace of 6 min/km.

How do I convert pace to minutes per mile? Multiply the pace in min/km by 1.60934. For instance, 5 min/km = 8.05 min/mile (about 8 min 3 sec).

Is a lower pace always better? In running, yes—lower pace means faster. But if you’re doing a recovery jog, a higher pace (slower) might be intentional. Context matters.

Why does the calculator show 5.00 instead of 5:00? The calculator outputs decimal minutes. To get minutes and seconds, multiply the fractional part by 60. 5.50 min = 5 min 30 sec.

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in t | Finish time | min | 50 | 0
in d | Distance | km | 10 | 0
out pace | Average pace | min/km | t / d | 2
out speed | Average speed | km/h | d / (t / 60) | 2