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Formula

The calculator works out two related running metrics from the same two inputs. The average pace is the finish time divided by the distance:

pace = t / d

where t is the finish time in minutes and d is the distance in kilometers. The result is in minutes per kilometer. The average speed is the distance divided by the time in hours:

speed = d / (t / 60)

because t is in minutes, so t / 60 converts it to hours. The speed result is in kilometers per hour.

Worked Example

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

Step 1: Calculate the pace.

pace = 50 / 10 = 5.00 min/km

Step 2: Calculate the speed.

speed = 10 / (50 / 60) = 10 / 0.8333 = 12.00 km/h

So your average pace is 5 minutes per kilometer, and your average speed is 12 kilometers per hour.

Why This Matters

Pace and speed are two different ways of expressing the same effort. Pace tells you how long it takes to cover one unit of distance, which is how most runners think. Speed tells you how much distance you cover per unit of time, which is how cyclists and drivers think. Knowing both helps you compare efforts across different activities and understand your training data from apps or watches that may display one or the other.

For example, a 5 km run in 30 minutes gives a pace of 6 min/km and a speed of 10 km/h. A 21.1 km half marathon in 1 hour 45 minutes (105 minutes) gives a pace of 4.98 min/km and a speed of 12.06 km/h. The calculator handles any distance and time you enter.

How to Use the Calculator

Enter your finish time in minutes (use decimal for seconds, e.g., 45.5 for 45 minutes 30 seconds) and your distance in kilometers. The calculator instantly shows your average pace and speed. You can use it for any distance, from a 400 m track repeat (0.4 km) to a 100 km ultra, as long as the time is in minutes.

If you have a time like 1:23:45 (1 hour, 23 minutes, 45 seconds), convert it to minutes: 1 hour = 60 minutes, 45 seconds = 0.75 minutes, so total = 60 + 23 + 0.75 = 83.75 minutes. Enter 83.75 as the time.

Common Mistakes

The most common error is mixing units. If you enter distance in miles but the formula expects kilometers, the pace will be wrong. To convert miles to kilometers, multiply by 1.60934. For example, a 5-mile run is about 8.05 km. Another mistake is using seconds instead of minutes. If you enter 3000 seconds instead of 50 minutes, the pace will be 300 seconds per km, which is clearly wrong. Always convert to minutes first.

Rounding can also cause small errors. The calculator rounds to two decimal places for both outputs. For a more precise pace, use more decimals or keep the raw numbers. If you are training with a specific pace target, even 0.1 min/km difference matters over a long race.

Limitations of the Formula

This is a simple average calculation. It assumes you ran at a perfectly even effort. In reality, most runs have hills, stops, and varying speed, so your instantaneous pace fluctuates. The average pace is still useful for planning and comparison, but it does not tell you about your pacing strategy. Also, the formula does not account for elevation gain, temperature, or fatigue, which can make the same pace feel harder on different days.

For track workouts, you might want to know your pace per 400 m lap. Multiply the min/km pace by 0.4 to get minutes per lap. For example, 5 min/km pace is 2 minutes per 400 m lap.

When to Use This Calculator

Use it whenever you have a finish time and a distance and want to know your average pace or speed. This is common after a race, a training run, or a treadmill session. It is also useful for planning: if you want to run a 10 km in 45 minutes, you can enter 45 and 10 to see that you need a 4:30 min/km pace. Conversely, if you know your target pace, you can work backward to estimate a finish time, though this calculator does not do that directly.

For treadmill running, you may see speed in km/h and want to know the pace in min/km. Enter the distance you ran (e.g., 5 km) and the time you ran (e.g., 30 minutes) to get both.

Frequently Asked Questions

How do I convert my time from hours and minutes to minutes? Multiply the hours by 60 and add the minutes. For example, 1 hour 20 minutes = 1 × 60 + 20 = 80 minutes. If you have seconds, divide them by 60 and add to the minutes. 45 seconds = 0.75 minutes.

What is a good running pace for a beginner? A beginner might run at 7–9 min/km, while a recreational runner often runs 5–6 min/km. Competitive runners may run under 4 min/km. The best pace depends on your fitness, age, and the distance. Use this calculator to find your current average pace and then set a realistic goal.

Can I use this for walking or cycling? Yes, the formula works for any activity where you cover a distance in a time. For cycling, speed is usually more relevant, and the calculator gives you that in km/h. For walking, pace is often expressed in min/km, and the calculator works the same.

Why is my pace different on a treadmill vs. outdoors? Treadmills often display speed in km/h, not pace. To convert, use this calculator with the distance shown on the treadmill and the time you ran. Treadmills may also be slightly inaccurate, so your actual outdoor pace may differ.

How do I convert pace from min/km to min/mile? Multiply the min/km pace by 1.60934. For example, 5 min/km is 5 × 1.60934 = 8.05 min/mile. To convert speed from km/h to mph, divide by 1.60934. 12 km/h is 12 / 1.60934 = 7.46 mph.

What if I run a distance that is not a whole number? Enter the exact distance as a decimal. For example, a 5K race is 5.0 km, a 10K is 10.0 km, and a half marathon is 21.0975 km. The calculator accepts any positive number up to 100,000 km.

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in t | Finish time | min | 50 | 0
in d | Distance | km | 10 | 0 | 100000
out pace | Average pace | min/km | t / d | 2
out speed | Average speed | km/h | d / (t / 60) | 2