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Formula

The calculator works out your average pace and speed from a finish time and a distance. The formulas are:

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

Where:

• Finish time (t) is in minutes (e.g., 50 minutes).
• Distance (d) is in kilometers (e.g., 10 km).
• Pace is the number of minutes it takes to cover one kilometer.
• Speed is the number of kilometers you cover in one hour.

Worked Example

Using the default values from the calculator: you finish a 10 km run in 50 minutes.

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

The calculator shows an average pace of 5.00 min/km and an average speed of 12.00 km/h.

When to Use This Calculator

This tool is handy for runners, cyclists, or walkers who have a GPS watch or a phone app that gives total time and distance, but not pace or speed. Instead of doing mental math during a workout, you can enter the numbers afterward to see your performance. It also works for any activity where you cover a known distance in a known time, like a 5 km walk or a 25 km bike ride.

How to Read the Result

The pace tells you how fast you are moving in minutes per kilometer. A lower pace means you are faster. For example, 4:30 min/km is faster than 5:00 min/km. The speed gives you the same information in kilometers per hour, which is what many car speedometers use. If you are used to miles, you can convert: 1 km ≈ 0.621 miles. So a 5:00 min/km pace is roughly 8:03 min/mile.

Common Mistakes

• Mixing units: If you enter distance in miles but time in minutes, the pace comes out in min/mile, not min/km. Always use the same unit system.
• Forgetting to convert seconds: If your time is 50 minutes and 30 seconds, you must enter 50.5 minutes, not 50.30. The calculator expects minutes as a decimal.
• Rounding too early: If you round the pace to 5.0 min/km and then try to compute speed, you may get a slightly different number. Use the full precision in your own calculations.

Limits of the Formula

This formula gives an average pace and speed over the whole distance. It does not account for elevation changes, stops, or variations in effort. If you run a hilly course, your average pace will be slower than on a flat course even if you feel you worked just as hard. The formula also assumes a constant speed, which is rarely true in real workouts. For interval training or uneven terrain, you may want to look at per-segment data from your GPS device.

Frequently Asked Questions

How do I convert min/km to min/mile?

Multiply the pace in min/km by 1.609. For example, 5.00 min/km × 1.609 = 8.045 min/mile, which is about 8:03 per mile.

What if I only know my speed in km/h?

To get pace in min/km, divide 60 by the speed. For instance, 12 km/h → 60 ÷ 12 = 5.00 min/km.

Can I use this for swimming or rowing?

Yes, as long as you measure distance in the same unit (km) and time in minutes. For swimming, you might use meters instead; just convert the distance to km first (e.g., 1500 m = 1.5 km).

Why does the calculator show pace with two decimals?

Two decimals give a more precise number than whole minutes. A pace of 5.03 min/km is about 5 minutes and 2 seconds per km, which is useful for training plans.

Is a lower pace always better?

Yes, for covering a fixed distance, a lower pace means you finish faster. However, in training, running some sessions at a slower pace is beneficial for endurance and recovery.

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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