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Yes, you can change the default account used for contacts on both Android and iPhone, though the exact steps differ by platform and manufacturer. This article explains how to switch your default contact account, what happens when you do, and how to avoid common pitfalls like duplicate contacts or lost sync.

Formula

The calculator works out your average pace and speed for a run, walk, or ride. Enter the total time taken (in minutes) and the distance covered (in kilometers). The calculator then divides time by distance to get pace, and distance by time (converted to hours) to get speed.

In symbols:

• Pace = T / D (minutes per kilometer)
• Speed = D / (T / 60) (kilometers per hour)

Where:

• T = total time in minutes
• D = distance in kilometers

Worked Example

Using the default values: T = 50 minutes, D = 10 km.

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

So the calculator returns a pace of 5.00 min/km and a speed of 12.00 km/h.

When to Use This Calculator

Use this tool when you want to know your average pace for training, race planning, or comparing workouts. It’s also handy for converting between pace and speed if you’re used to one unit but need the other. For example, a treadmill might show speed in km/h, but your running app logs pace in min/km.

How to Read the Result

A lower pace (min/km) means faster running. A higher speed (km/h) also means faster. The two are inversely related: if you increase speed, your pace drops. For instance, 5.00 min/km equals 12.00 km/h, while 6.00 min/km equals 10.00 km/h.

Common Mistakes

• Mixing units: If you enter distance in miles but time in minutes, the pace will be in min/mile, not min/km. Convert miles to kilometers (1 mile = 1.60934 km) before using the calculator.
• Using seconds: If you enter time in seconds instead of minutes, the pace will be wildly small. Convert seconds to minutes (divide by 60) first.
• Rounding too early: If you round intermediate values, the final result may be off. Keep full precision until the last step.

Limitations of the Formula

This formula gives average pace and speed over the whole distance. It does not account for elevation gain, stops, or variations in effort. For hilly routes, your average pace may be slower than your flat pace even with the same effort. Also, the calculator assumes constant speed; real workouts have surges and recoveries.

Frequently Asked Questions

How do I convert pace to speed?

Divide 60 by your pace (in minutes per kilometer) to get speed in km/h. For example, 5 min/km → 60 / 5 = 12 km/h. Conversely, divide 60 by speed to get pace: 12 km/h → 60 / 12 = 5 min/km.

What is a good average pace for a beginner?

It varies widely by age, fitness, and gender. A common beginner jogging pace is around 7–8 min/km (8.5–7.5 km/h). Walking is typically 10–12 min/km (5–6 km/h). Focus on effort rather than a specific number.

Does the calculator work for miles?

You can use it with miles if you treat the distance as miles and the pace as min/mile. However, the speed output will be in miles per hour. For km/h, convert miles to kilometers first.

Why is my pace slower on a treadmill?

Treadmills often display speed in km/h, and many people find they run slower on a treadmill due to lack of wind resistance and different biomechanics. Also, treadmill speed may not be perfectly calibrated. Use the calculator to convert your treadmill speed to pace and compare with outdoor runs.

How do I calculate pace for intervals?

For intervals, calculate pace separately for each rep using the same formula with the rep’s distance and time. Do not average the times and distances together unless you want overall average pace for the entire session.

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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