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Formula

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

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

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

Where:

• Finish time is the total time taken, in minutes.
• Distance is the total distance covered, in kilometers.
• Pace is the time taken to cover one kilometer, in minutes per kilometer.
• Speed is the average velocity, in kilometers per hour.

Worked Example

Using the default values from the calculator: finish time = 50 minutes, distance = 10 km.

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 displays the same results: a pace of 5.00 min/km and a speed of 12.00 km/h.

When to Use This Calculator

Use this tool for any activity where you measure distance and time—running, cycling, walking, or rowing. It’s particularly useful for:

• Planning a training pace for a race.
• Comparing your speed across different routes or sessions.
• Converting a target pace into a finish time for a known distance.

For example, if you want to run a 10 km race in under 50 minutes, you need a pace faster than 5.00 min/km. The calculator shows that a 50-minute finish gives exactly 5.00 min/km, so you’d need to aim slightly faster.

How to Read the Results

The first output, pace, is the number most runners care about. A lower pace means faster running. The second output, speed, is more common in cycling or driving contexts. Both are derived from the same inputs, so they always agree—if you run faster, your pace drops and your speed rises.

Pace is usually expressed in minutes per kilometer (or minutes per mile), while speed is in kilometers per hour (or miles per hour). Some devices show pace as “5:00� meaning 5 minutes and 0 seconds per kilometer. This calculator gives decimal minutes, so 5.50 min/km equals 5 minutes and 30 seconds per kilometer.

Common Mistakes and Unit Mix-ups

The most frequent error is mixing units. If you enter a distance in miles but the calculator expects kilometers, your pace will be wrong. Similarly, if you enter a finish time in hours instead of minutes, the result will be off by a factor of 60. Always check:

• Distance is in kilometers (or convert miles to km by multiplying by 1.60934).
• Time is in minutes (or convert hours to minutes by multiplying by 60).
• For pace in min/mile, use distance in miles and time in minutes.

Another common issue is rounding too early. If you round your pace to 5.0 min/km and then multiply by the distance, you might get a finish time that differs from your actual input. Use the full precision until the final step.

Limitations of the Formula

This calculator assumes a constant pace throughout the activity. Real-world efforts vary—you might run faster downhill, slower uphill, or sprint at the end. The average pace is still useful, but it won’t tell you about pacing strategy. It also ignores rest stops, so if you pause your watch, the time should exclude those breaks.

For very short distances (like 100 m) or very long ones (like a marathon), the formula still works, but the inputs need to be accurate. A one-second error in a 50-meter sprint changes the pace significantly, while the same error in a marathon is negligible.

Frequently Asked Questions

How do I convert my pace from min/km to min/mile?
Multiply the pace in min/km by 1.60934. For example, 5.00 min/km becomes 8.05 min/mile. Alternatively, use the calculator with distance in miles and time in minutes.

What is a good running pace for a beginner?
A common beginner pace is around 6:30 to 7:30 min/km (10:30 to 12:00 min/mile). This varies greatly with age, fitness, and terrain. The calculator helps you find your current average pace, not a target.

Can I use this for cycling or swimming?
Yes, as long as you measure distance and time. For cycling, speed in km/h is more intuitive. For swimming, pace is often expressed per 100 m, so you’d divide the total pace by the number of 100 m segments.

Why does my GPS watch show a different pace?
GPS watches often show “current pace� based on the last few seconds, which fluctuates. They also account for elevation gain and loss. Your average pace over the whole run, as calculated here, is the most reliable measure of your overall speed.

How do I calculate finish time from a target pace?
Multiply your target pace (in min/km) by the race distance (in km). For example, a 5:30 min/km pace over 10 km gives 55 minutes. Then add any extra seconds per km to get the total time.

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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