Free iPhone 4 Case Program: What It Was

Yes, Apple ran a free iPhone 4 case program in 2010 after widespread reports of dropped calls caused by the phone’s external antenna. The program offered every iPhone 4 owner a free case or a full refund if they preferred, and it ran from July 23 to September 30, 2010.

Formula

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

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

Where:

• Finish time – total time taken, in minutes (e.g., 50 minutes).
• Distance – the length of the run or ride, in kilometers (e.g., 10 km).
• Pace – how many minutes it takes to cover one kilometer; lower means faster.
• Speed – how many kilometers you cover in one hour; higher means faster.

Worked Example

Using the default values from the calculator (finish time = 50 minutes, distance = 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 it after any run, bike ride, or walk where you know the total time and distance. It’s handy for:

• Setting training paces – if you want to run a 10 km in under 50 minutes, you need a pace of 5:00 min/km.
• Comparing workouts – see if you’re getting faster by checking the pace trend.
• Planning events – estimate a finish time for a given distance if you know your typical pace.

How to Read the Result

The first output, pace, is the number most runners care about. A pace of 5.00 min/km means you take 5 minutes to cover each kilometer. The second output, speed, is the same information expressed as kilometers per hour – 12 km/h in the example. Both are correct; which one you use depends on your sport. Runners usually talk in pace, cyclists often talk in speed.

Common Mistakes and Unit Mix-Ups

• Using hours instead of minutes – if you enter 1.5 hours as 1.5, the calculator treats it as 1.5 minutes. Convert hours to minutes first (1.5 h = 90 min).
• Mixing miles and kilometers – the calculator assumes kilometers. If your distance is in miles, multiply by 1.60934 to get km, or your pace will look unrealistically fast.
• Forgetting to convert seconds – if your finish time is 50 minutes and 30 seconds, enter 50.5 minutes, not 50.30.

Limitations of the Formula

The formula assumes a steady pace throughout. It doesn’t account for hills, stops, or uneven effort. For a hilly run, your average pace will be slower than your flat-ground pace, and the calculator won’t tell you about that variation. It also only gives you the average – it can’t show splits or where you slowed down.

Frequently Asked Questions

What is a good pace for a beginner?

A beginner runner might aim for a pace of 6:30 to 7:30 min/km (about 8–9 km/h). That’s a comfortable conversational effort. As you train, you’ll likely get faster, but the “good� pace depends on age, fitness, and distance.

How do I convert my pace to miles per hour?

First get your speed in km/h from the calculator, then divide by 1.60934. For example, 12 km/h ÷ 1.60934 = 7.46 mph.

Can I use this for walking?

Yes. Walking pace is usually around 12–15 min/km (4–5 km/h). Enter your walking time and distance, and the calculator will give you your pace and speed.

Why is my pace different from my treadmill’s pace?

Treadmills often measure distance from belt rotation, which can differ from outdoor GPS. Also, outdoor runs have wind, turns, and elevation changes. So a treadmill pace may not match your outdoor pace exactly.

Does the calculator work for any distance?

Yes, as long as you enter the time and distance in the same units (minutes and kilometers). It works for 5 km, 10 km, half marathon, or any other distance.

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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