Custom Lipstick Printer: How It Works

Yes, a device called a custom lipstick printer can print personalized lipstick shades at home. You connect it to a smartphone app, pick or create a color, and the machine blends base ingredients to produce a small batch of lipstick in that exact shade. These devices are sold by a few beauty-tech companies and are meant for personal use, not commercial manufacturing.

Formula

The calculator works out your average pace and speed for a run or ride. The formula is:

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

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

Where:

• t = finish time in minutes (e.g., 50)
• d = distance in kilometers (e.g., 10)

The pace is the number of minutes it takes to cover one kilometer. The speed is the average kilometers covered per hour. Both are standard ways to measure running performance.

Worked Example

Using the default values of 50 minutes and 10 km:

1. Pace = 50 ÷ 10 = 5.0 min/km
2. Speed = 10 ÷ (50 ÷ 60) = 10 ÷ 0.8333 = 12.0 km/h

So a 50-minute, 10 km run gives an average pace of 5:00 per kilometer and an average speed of 12.0 km/h. The calculator shows these results rounded to two decimals.

When to Use This Calculator

Use this tool when you finish a run or bike ride and want to know your average pace or speed without doing the math yourself. It is especially handy for:

• Checking if you hit a target pace for a race.
• Comparing two workouts of different distances.
• Setting realistic goals for a future event.

Pace is common in running, while speed is more common in cycling. Both are useful for tracking improvement over time.

How to Read the Result

A lower pace (e.g., 4:30 min/km) means faster running. A higher speed (e.g., 15 km/h) also means faster movement. For example, a 5:00 min/km pace equals 12 km/h; a 6:00 min/km pace equals 10 km/h. The two numbers are inverses of each other, so when pace goes down, speed goes up.

If you run on a treadmill, the machine often shows speed in km/h or mph. Knowing your pace helps you set the treadmill to match your outdoor pace.

Common Mistakes

• Mixing units: If you enter distance in miles but time in minutes, the pace will be minutes per mile, not per km. Convert miles to km (1 mile = 1.60934 km) before entering.
• Forgetting to convert seconds: If your finish time is 50 minutes and 30 seconds, enter 50.5 minutes, not 50.30.
• Rounding too early: Round only the final result, not intermediate steps, to avoid small errors.

The calculator assumes a constant pace. If you run with varying speed (e.g., intervals), the result is still the average pace over the whole distance, which is useful but doesn’t show the variations.

Limits of the Formula

The formula gives an average. It doesn’t account for elevation gain, wind, or stops. Two runs with the same average pace can feel very different. For training purposes, use the average as a baseline, not the whole story.

Also, the calculator works with any distance unit as long as you are consistent. If you enter distance in miles, the pace will be minutes per mile, and speed will be miles per hour. The default is km, but you can change the numbers to match your measurement.

Frequently Asked Questions

What is a good running pace for a beginner?

A beginner might run at 7:00 to 8:00 min/km (about 8.5 to 7.5 km/h). This is a comfortable conversational pace. It varies by age, fitness, and experience. The best pace is one you can maintain without excessive strain.

How do I convert pace to speed?

Divide 60 by your pace in minutes per km. For example, a 5:00 min/km pace is 60 ÷ 5 = 12 km/h. If your pace is 6:30 (6.5 minutes), then 60 ÷ 6.5 = 9.23 km/h.

Why is pace more common than speed in running?

Pace is easier to use during a run because you can check your watch and know how many minutes per km you are running. Speed in km/h is less intuitive for most runners, especially on hilly routes where pace stays more stable in terms of effort.

Does the calculator work for walking?

Yes, the same formula applies. A typical walking pace is 12 to 15 minutes per km, which is 4 to 5 km/h.

How do I enter a time like 1 hour 10 minutes?

Convert to minutes: 1 hour = 60 minutes, plus 10 = 70 minutes. Enter 70 in the finish time field.

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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