Original Apple iPhone Concept: Design Origins

The original Apple iPhone concept refers to the pre-2007 design and engineering work inside Apple that turned a tablet-sized multitouch project into the pocket phone that launched on January 9, 2007. The core concept was not a single sketch but a series of prototypes and interface decisions, most notably the shift from a physical keyboard to a fully touch-driven screen. This article explains what those early concepts actually were, how they evolved, and what parts of them survived into the shipping iPhone.

Formula

The calculator above works out your average pace and speed for a run, walk, or ride. The formulas are:

Pace = Finish time (minutes) ÷ Distance (km)

Speed = Distance (km) ÷ (Finish time (minutes) ÷ 60)

Where:

• Finish time (t) – total time from start to finish, in minutes.
• Distance (d) – total distance covered, in kilometers.
• Pace – minutes per kilometer (min/km). A lower number means faster running.
• Speed – kilometers per hour (km/h). A higher number means faster movement.

Both results are related: pace is the inverse of speed, just expressed in different units. If you know one, you can convert to the other, but this calculator gives you both directly from your time and distance.

Worked Example

Using the default values from the calculator above: finish time = 50 minutes, distance = 10 km.

1. Calculate pace: 50 minutes ÷ 10 km = 5.0 min/km
2. Calculate speed: 10 km ÷ (50 ÷ 60) = 10 km ÷ 0.8333 hours = 12.0 km/h

So with the defaults, your average pace is 5:00 min/km and your average speed is 12.0 km/h. That is a realistic time for a moderately fast recreational runner covering 10 km.

When to Use This Pace Calculator

Use this calculator any time you want a quick, accurate read on your training effort without pulling out a separate pace chart. Common situations include:

• After a training run, to log your average pace and speed.
• Before a race, to check whether a target finish time is realistic for your current fitness.
• When planning a route, to estimate how long a given distance will take at a known pace.
• For interval workouts, to verify you are holding the intended pace per repeat.

It works for any distance-based activity – running, walking, cycling, hiking, or rowing – as long as you measure distance in kilometers and time in minutes.

How to Read the Results

The first output, pace, is what most runners care about. A pace of 5:00 min/km means you cover one kilometer every five minutes. The second output, speed, is the same effort expressed as kilometers per hour (12.0 km/h).

For comparison, typical recreational running paces range from about 6:00 to 8:00 min/km (7.5–10 km/h). Elite runners may hold under 3:00 min/km (20+ km/h) for short distances. Walking pace is usually between 10:00 and 12:00 min/km (5–6 km/h).

One common mistake is confusing pace with speed. A lower pace number (fewer minutes per km) means faster running, while a higher speed number also means faster running. They move in opposite directions, so always double-check which one you are looking at.

Common Mistakes and Unit Mix-Ups

The most frequent error is entering time in hours instead of minutes. If you run for 1 hour 15 minutes, enter 75, not 1.15. The calculator expects minutes only.

Another common mistake is mixing distance units. If you measure your route in miles, convert to kilometers first (1 mile = 1.60934 km) or the pace will be wrong. For example, a 5-mile run is 8.05 km, not 5 km.

Rounding errors also appear when you round pace to two decimals. A pace of 5.33 min/km is not the same as 5:33 per km – the decimal fraction of a minute must be converted to seconds (0.33 min = 20 seconds). This calculator gives pace in decimal minutes, so for a precise pace in minutes and seconds, multiply the decimal part by 60.

Limitations of the Formula

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

• Elevation gain or loss – a hilly route will feel harder than the same distance on flat ground.
• Stops or pauses – if you stop for water or traffic lights, the time you enter should be moving time, not total elapsed time, unless you want to include stops.
• Wind, terrain, or surface – trail running vs. road running changes effort significantly.
• Heart rate or power – pace alone doesn’t tell you how hard you worked.

For training purposes, average pace is a useful metric, but it should be paired with perceived effort or heart rate for a fuller picture.

Frequently Asked Questions

What is a good running pace for a beginner?

Most beginners run between 7:00 and 9:00 min/km (roughly 6.7–8.6 km/h). The key is to run at a conversational effort – you should be able to speak in short sentences. Over time, your comfortable pace will naturally get faster as your aerobic fitness improves.

How do I convert my pace from min/km to min/mile?

Multiply the pace in min/km by 1.60934. For example, 5:00 min/km becomes 8:03 per mile (5 × 1.60934 = 8.0467 minutes, or about 8:03). To go the other way, divide min/mile by 1.60934.

Does this calculator work for cycling?

Yes. Enter your total cycling time in minutes and distance in kilometers. The calculator will give your average speed in km/h, which is the standard metric for cycling. Pace in min/km is less common for cyclists, but it is still valid if you want it.

What is the difference between average pace and instantaneous pace?

Average pace is your total time divided by total distance for the whole workout. Instantaneous pace is your pace at a single moment, like what a GPS watch shows when you speed up or slow down. This calculator gives average pace only.

Should I use moving time or total time?

It depends on your goal. For training logs, most runners use moving time to see true running effort. For race results, total time (including water stops) is the official number. Decide which you want before entering data, and be consistent.

How accurate is the speed calculation?

It is mathematically exact given the time and distance you enter. The accuracy of the result depends entirely on how accurately you measure time and distance. GPS watches are typically within 1–2% for distance, so your calculated speed will be similarly accurate.

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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