AP Curve Calculator: Pace & Speed From Time

This calculator works out your average pace (min/km) and average speed (km/h) from a finish time and distance. You enter the total time and the distance covered, and it returns your pace and speed for that effort.

Formula

The two formulas are simple divisions:

• Pace = total time (minutes) ÷ distance (km) → result in min/km
• Speed = distance (km) ÷ (total time (minutes) ÷ 60) → result in km/h

Where:

• t = total time in minutes (e.g., 50 min)
• d = distance in kilometres (e.g., 10 km)

Pace tells you how long one unit of distance takes; speed tells you how many units of distance you cover in one hour. They are reciprocals once you account for the 60-minute hour.

Worked Example

Using the default values (50 minutes for 10 km):

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

The calculator shows 5.00 min/km and 12.00 km/h. That matches a common recreational running pace.

When to Use This Calculator

Use it any time you have a total time and a distance and want a standardised comparison. Runners use pace to plan training sessions; cyclists and drivers more often use speed. The same math applies to walking, hiking, rowing, or any activity where you track time and distance.

It is also useful for race planning: if you know the distance and target pace, you can work backwards to estimate finish time (time = pace × distance).

How to Read the Result

A lower pace number means faster (fewer minutes per km). A higher speed number means faster (more km per hour). For example, 4:30 min/km is faster than 5:00 min/km, and 13.3 km/h is faster than 12.0 km/h.

Pace is usually written as minutes:seconds per km, but this calculator gives decimal minutes. To convert 5.50 min to 5:30, multiply the decimal part by 60: 0.50 × 60 = 30 seconds.

Common Mistakes and Unit Mix-Ups

• Using hours instead of minutes – if you enter 1.5 hours as 1.5, the result will be wrong. Convert hours to minutes first (1.5 h = 90 min).
• Mixing miles and kilometres – the calculator assumes km. If your distance is in miles, convert to km (1 mile ≈ 1.609 km) or use a miles-based version.
• Rounding too early – round only at the final step. For example, 50 ÷ 10 = 5.00 exactly, but 45 ÷ 10.5 = 4.2857…, which rounds to 4.29 min/km, not 4.28.
• Confusing pace and speed – a 5 min/km pace equals 12 km/h, not 5 km/h. They are different units.

Limits of the Formula

The formula assumes constant speed. Real-life efforts include hills, stops, and changes in intensity, so the average pace/speed is a summary, not a description of every moment. It also ignores factors like wind, terrain, or fatigue – it is pure arithmetic on total time and distance.

For interval training or uneven routes, the average may not reflect the effort required. Use it as a planning tool, not a precise performance measure.

Frequently Asked Questions

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

Multiply the min/km value by 1.609. For example, 5.00 min/km × 1.609 = 8.05 min/mile (about 8:03). To convert back, divide by 1.609.

What is a good running pace?

It depends on fitness, age, and distance. A 10 km time of 50 minutes (5:00 min/km) is a common recreational goal. Elite runners may hold 3:00 min/km for 10 km. There is no universal “good” – compare to your own history.

Can I use this for cycling or driving?

Yes. The math is identical. For cycling, you might prefer speed in km/h; for driving, you might use the same formula with hours converted to minutes.

Why does the calculator show decimal minutes instead of mm:ss?

Decimal minutes are easier for calculations. To get mm:ss, multiply the fractional part by 60. For instance, 4.75 min = 4 min + 0.75×60 = 4:45.

How do I calculate finish time from pace and distance?

Multiply pace (min/km) by distance (km). For 5:00 min/km over 10 km, that’s 5 × 10 = 50 minutes. This calculator does the reverse – it gives pace from time and distance.

What if I enter time in hours and minutes?

Convert everything to minutes first. For 1 hour 20 minutes, enter 80 (60+20). The calculator expects total minutes, not separate hours and minutes fields.

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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