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06 Numbers and Powers

Shopify Print Invoice: How to Print & Customize

Card No. 06·51308 · Updated · Standard formula, shown below

Average pace 5.00 min/km
Average speed
12.00 km/h
Result
Finish time
50 min
You entered
Distance
10 km
You entered
You enter
Finish time, Distance
You get
Average pace, Average speed
Rounding
2 dp

To print an invoice in Shopify, go to Orders, open the order you want, and click the printer icon in the top right to print the default invoice. For more control over layout and content, you’ll need to use a third-party invoice app or edit the order’s HTML template. This article explains the built-in method, how to customize it, and what to do when the default option isn’t enough.

Formula

The average pace is the total time divided by the distance:

Pace (min/km) = Finish Time (min) ÷ Distance (km)

Average speed is the distance divided by the time in hours:

Speed (km/h) = Distance (km) ÷ (Finish Time (min) ÷ 60)

Variables:

  • t – finish time in minutes (e.g., 50 min)
  • d – distance in kilometers (e.g., 10 km)
  • pace – minutes per kilometer
  • speed – kilometers per hour

Worked Example

Using the default values (t = 50 min, d = 10 km):

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

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

Why Use a Pace Calculator?

Runners, walkers, and cyclists use pace to plan workouts and races. Knowing your pace helps you set realistic goal times, choose the right training intensity, and avoid starting too fast in a race. For example, a 10 km race in 50 minutes means you need to hold 5:00 per kilometer. A pace calculator converts raw time and distance into a number you can actually use during the run.

How to Read the Results

The pace result is given in minutes per kilometer (or minutes per mile if you use miles). A lower number means faster. Speed is the inverse – higher is faster. Many runners think in pace, while cyclists often think in speed. Both are shown so you can use whichever you prefer. If you ran 5 km in 30 minutes, your pace is 6:00 per km and your speed is 10 km/h.

Common Mistakes

  • Mixing units – If you enter distance in miles but expect min/km, the result will be wrong. Convert miles to kilometers (multiply by 1.60934) or use a calculator that supports both.
  • Using seconds instead of minutes – If you enter 3000 seconds instead of 50 minutes, the pace will be 300 min/km. Always convert to minutes.
  • Rounding too early – Rounding the time to the nearest minute can change the pace by several seconds. Keep at least two decimals for accuracy.

Limits of This Formula

The formula assumes constant speed – it gives average pace, not the pace at any specific moment. Real runs have hills, stops, and changes in effort, so your actual split times will vary. The formula also doesn’t account for rest breaks or elevation. For interval training or hilly routes, use a GPS watch that records pace in real time.

When to Use This Calculator

Use it before a race to plan your target pace, after a run to see what you actually did, or during training to set intervals. For example, if you want to finish a half marathon (21.1 km) in 2 hours (120 minutes), enter 120 and 21.1 – the pace is 5.69 min/km (5:41 per km). This tells you what to hold on your watch.

Frequently Asked Questions

What is a good running pace? It depends on your fitness, age, and distance. A beginner might run 7:00 min/km, while a competitive runner might do 4:00 min/km. The pace calculator just tells you the math – what’s “good” is personal.

Should I use pace or speed? Most runners use pace (min/km) because it’s easier to check mid-run. Cyclists and some treadmill runners use speed (km/h). Both are valid – just pick one and be consistent.

How do I convert min/km to min/mile? Multiply the pace in min/km by 1.60934. For example, 5:00 min/km is about 8:03 per mile. Or use a converter that handles both units.

Does the calculator work for walking? Yes, the same formula works for walking, hiking, or any activity where you measure time and distance.

Why does my GPS watch show a different pace? GPS watches calculate pace based on your current speed, which fluctuates. The calculator gives an average over the whole distance, which is more accurate for planning.

Related

Formula used
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

Each line is one input (in, sel, list) or one result (out: label, unit, formula, decimals). How the calculators work

Method: the standard formula for this calculation, rounded as each result states. See how the calculators work or report an error.

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