Pace Calculator: Time, Distance, Speed

This pace calculator works out your average running, cycling, or walking pace from a distance and a finish time. You enter how far you went and how long it took, and it returns your pace in minutes per kilometer, plus your average speed in kilometers per hour. It also lets you convert a target pace into a finish time for a given distance, so you can plan a workout or a race.

Formula

The calculator uses two basic relationships between time, distance, and pace (or speed).

Pace is the time it takes to cover one unit of distance. If you measure time in minutes and distance in kilometers, then:

pace (min/km) = total time (min) / distance (km)

For example, if you run 10 km in 50 minutes, your pace is 50 / 10 = 5.00 min/km (often written as 5:00 per km).

Speed is the distance covered per unit of time. In kilometers per hour:

speed (km/h) = distance (km) / (total time (min) / 60)

The division by 60 converts minutes into hours, because there are 60 minutes in an hour. For the same 10 km in 50 minutes, the speed is 10 / (50/60) = 10 / 0.8333 = 12.00 km/h.

Both formulas are just rearrangements of the same relationship: distance = speed × time. If you know any two of the three quantities (distance, time, pace/speed), you can find the third.

Worked Example

Suppose you enter the default values: finish time = 50 minutes, distance = 10 km.

1. Start with the finish time: 50 minutes.
2. Divide by the distance: 50 ÷ 10 = 5.
3. The pace is 5.00 min/km.
4. Now compute speed: divide the distance by the time in hours. Time in hours = 50 ÷ 60 = 0.8333 hours.
5. Speed = 10 ÷ 0.8333 = 12.00 km/h.

The calculator shows the pace as 5.00 min/km and the speed as 12.00 km/h, matching the steps above.

How to Use This Calculator

This calculator is most useful when you have a recorded distance and time and want to know your average pace or speed. Runners often use pace to set training intensities, cyclists use speed for the same purpose, and walkers may want to estimate how long a route will take.

To use it, enter any positive number for the finish time (in minutes) and any positive distance (in kilometers). The calculator will immediately show your average pace and speed. You can also use it backward: if you have a target pace, multiply that pace by the distance to get the finish time. For example, a 5:30 min/km pace over 10 km gives 55 minutes. The calculator does not do that conversion directly, but you can enter the target pace as the time and 1 km as the distance to see the pace, or simply do the multiplication yourself.

Common Mistakes

• Mixing units. The calculator works in minutes and kilometers. If you enter a time in hours (e.g., 1.5 for 1 hour 30 minutes), you will get a pace that is too small. Convert hours to minutes first: 1.5 hours = 90 minutes.
• Using miles instead of kilometers. If your distance is in miles, convert to kilometers (1 mile = 1.60934 km) before entering, or interpret the result as min/mile. The calculator does not know your units.
• Confusing pace and speed. A lower pace (e.g., 4 min/km) is faster than a higher pace (6 min/km), while a higher speed (15 km/h) is faster than a lower speed (10 km/h). They are inversely related.
• Forgetting that time is in minutes. If you enter 50 seconds instead of 50 minutes, the pace will be unrealistically low. Always convert seconds to minutes (divide by 60) before entering.

Tips

• For races, use the finish time and official distance to check your average pace. Most race results list pace, but you can verify it here.
• When training, use a target pace to plan a workout. For example, if you want to run 8 km at 5:00 min/km, your finish time should be 40 minutes. Enter 40 and 8 to see the pace.
• If you use a treadmill that shows speed in km/h, you can convert to pace by taking the reciprocal: pace (min/km) = 60 / speed (km/h). For 12 km/h, that is 5 min/km.
• For long distances, consider that your pace may vary due to terrain, wind, or fatigue. This calculator gives an average, not a detailed split.

Troubleshooting

If the calculator shows an error or a strange result, check the following:

• Zero or negative values. Both time and distance must be positive numbers. The calculator will reject zero or negative inputs, but if you see a “Cannot compute” message, it usually means one input is missing or invalid.
• Extremely large or small numbers. If you enter a time of 0.1 minutes (6 seconds) for a 10 km run, the pace will be 0.01 min/km, which is physically impossible. Double-check your units.
• Decimal separators. Use a period (.) for decimals, not a comma. If your locale uses commas, replace them with periods.
• Reversed inputs. If you accidentally swap time and distance, the pace will be absurd (e.g., 10 min/km becomes 0.1 min/km). Check which field has which value.

Frequently Asked Questions

What is a good running pace?

There is no single “good” pace; it depends on your fitness, age, and the distance. A recreational runner might do 6:00 min/km, while an elite runner might do 3:00 min/km. Use this calculator to find your own average and track improvements.

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

Multiply the pace in min/km by 1.60934. For example, 5:00 min/km is about 8:03 per mile. The calculator only works in km, so convert manually if needed.

Can I use this for cycling?

Yes. The math is the same. Enter your cycling distance and time, and you will get your average speed in km/h, which is a common metric for cyclists.

What if I only know my speed, not my pace?

You can convert speed to pace by dividing 60 by the speed. For example, 12 km/h gives 60/12 = 5 min/km. Or enter a time of 60 minutes and a distance equal to your speed (in km) to see the pace.

Does the calculator account for elevation gain?

No. It only uses flat distance and total time. Hills will make your pace slower for the same effort, but the calculator cannot know that.

Why is my pace shown as a decimal, not mm:ss?

The calculator outputs minutes per kilometer as a decimal (e.g., 5.50). To convert to minutes and seconds, multiply the decimal part by 60. For 5.50, that is 0.50 × 60 = 30 seconds, so 5:30 min/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