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Formula

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

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

Where:

• t = total finish time in minutes
• d = distance in kilometers

The first output (pace) is the headline result, as it directly answers the common question of how fast you are running per kilometer.

Worked Example

Using the default values from the calculator (50 minutes for 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

So a 50-minute 10K corresponds to a 5:00 min/km pace and a 12 km/h average speed.

When to Use This Calculator

Use this calculator whenever you have a race time or a training run time and want to know your average pace or speed. It is especially useful for:

• Planning race pace for a target finish time (e.g., sub-45 min 10K).
• Checking if you hit your intended easy or tempo pace during a workout.
• Comparing your performance across different distances.

Note that this calculator gives average pace, not accounting for elevation gain, stops, or uneven effort.

How to Read the Result

The pace result is shown in minutes per kilometer (or you can mentally convert to min/mile by multiplying by 1.609). Lower pace numbers mean faster running. Speed is shown in km/h; higher is faster. For most recreational runners, a 5:00 min/km pace is a moderate effort, while elite runners might hold 3:00 min/km for a 10K.

Common Mistakes

• Unit confusion: Mixing miles and kilometers. If your distance is in miles, convert to km (1 mile = 1.609 km) before using the formula.
• Time in decimal hours: Using 1.5 hours instead of 90 minutes. Always convert hours to minutes (multiply by 60).
• Rounding too early: Rounding the pace to 2 decimals is fine, but if you need exact speed, keep more precision in intermediate steps.

Limitations of the Formula

This is a simple average calculation. It does not account for:

• Terrain (hills, trails)
• Stops (traffic lights, water breaks)
• Wind or weather conditions
• Your heart rate or perceived effort

For training purposes, you might also want to track pace per lap or use a GPS watch that gives real-time pace.

Frequently Asked Questions

Is a 5:00 min/km pace good?

For a recreational runner, a 5:00 min/km pace (12 km/h) is a solid, respectable pace, roughly equivalent to a 50-minute 10K. It is faster than the average jogger but slower than competitive club runners.

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

Multiply the min/km value by 1.609. For example, 5:00 min/km × 1.609 = 8:03 min/mile. Conversely, divide min/mile by 1.609 to get min/km.

What is a good 10K time for a beginner?

For a beginner who has been running consistently for a few months, finishing a 10K in 60–70 minutes (6:00–7:00 min/km) is a common goal. More experienced beginners might aim for 50–60 minutes.

Can I use this calculator for marathon pace?

Yes, the formula works for any distance. Just enter the total time and distance. However, for a marathon, you might want to plan a slightly slower pace than your 10K pace due to fatigue.

Why does my GPS watch show a different pace?

GPS watches calculate pace based on instantaneous speed and may use a rolling average. They also account for elevation changes and can be affected by signal loss. The calculator here gives a simple average based on total time and distance, which is the most accurate for a race result.

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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