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No, a truly free smartphone—one you own outright with no strings, no data plan, and no hidden fees—does not exist. What you can get are free phones through carrier contracts, government assistance programs, or trade-in deals, but each comes with conditions that cost you money or personal data in other ways. This article explains what “free� really means in the smartphone market, how the offers work, and what to watch out for.

Formula

The calculator above works out your average running pace and speed. The formula for pace is:

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

And for speed:

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

Where:

• t = finish time in minutes
• d = distance in kilometers
• pace = minutes per kilometer (min/km)
• speed = kilometers per hour (km/h)

Worked Example

Suppose you run 10 km in 50 minutes. Using the default values:

1. Pace = 50 ÷ 10 = 5.00 min/km
2. 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 Use This Calculator

Runners use pace to plan training and race strategies. Knowing your average pace helps you set realistic goals, compare workouts, and estimate finish times for other distances. Speed in km/h is useful if you prefer thinking in terms of how fast you’re moving rather than how long each kilometer takes.

How to Read the Results

A lower pace (min/km) means faster running. For example, 4:30 min/km is faster than 5:00 min/km. Speed works the opposite way—higher km/h means faster. Most running apps show pace in minutes per kilometer or minutes per mile, so choose the unit you’re comfortable with.

Common Mistakes

• Mixing units: If you enter distance in miles but time in minutes, the result will be minutes per mile, not per kilometer. Always convert to the same unit system.
• Using seconds incorrectly: If your finish time is 50 minutes and 30 seconds, convert the seconds to decimal minutes (30 ÷ 60 = 0.5) before entering. So you’d enter 50.5, not 50.
• Rounding too early: Rounding the pace to 5.0 and then using that to calculate speed can give a slightly different result than doing the full calculation. Keep extra decimal places during the math.

Limits of This Formula

This formula gives your average pace over the whole distance. It doesn’t account for hills, wind, stops, or changes in speed. If you run intervals or walk part of the way, your average pace won’t reflect your true running effort. Also, the formula assumes a constant speed, which is rarely true in real runs.

Frequently Asked Questions

What is a good running pace?

A “good� pace depends on your fitness, age, and experience. For a casual runner, 6:00–7:00 min/km is common. Competitive runners might do 4:00–5:00 min/km. The best way to gauge your pace is to compare it to your own past performances, not to others.

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

Multiply the pace in min/km by 1.609. For example, 5:00 min/km × 1.609 = 8:03 min/mile. You can also use the speed: 12 km/h ÷ 1.609 = 7.46 mph.

Can I use this calculator for walking?

Yes, the math works the same for walking. Just enter your walking time and distance. Typical walking pace is around 10–12 min/km, but it varies with age and fitness.

Why does my running app show a different pace?

Apps often use GPS distance, which can vary slightly from a measured course. They also calculate pace in real-time, sometimes using a rolling average. For accurate pacing, use a known distance and a stopwatch.

What is the difference between pace and speed?

Pace is the time it takes to cover one unit of distance (min/km). Speed is the distance covered in one unit of time (km/h). They are inverse measures—faster pace means lower number, faster speed means higher number.

Does heart rate affect pace?

Heart rate is a measure of effort, not pace. You can run at the same pace with different heart rates depending on fatigue, heat, or stress. Pace and heart rate are separate metrics, though both are useful for training.

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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