Pace Calculator

Pace: a Key Metric for Keeping Progress.

Pace, especially in running, is one of the most important progress metrics for all levels of experience. From beginners, training for their first 5K, to veteran marathon athletes. Simply put, pace refers to how long it takes you to travel a specific distance, usually expressed as minutes per kilometer (min/km) or minutes per mile (min/mi). For example, if you run 5 kilometers in 25 minutes, your average pace is 5:00 min/km. This number gives you a clearer picture of your running speed than time alone, helping you track improvement and plan workouts more effectively. By dividing your time by the number of kilometers or miles you traveled, the value is standardized and can be used for any distance and speed.

Of course, pace can also be a useful metric in other exercises such as walking, running, cycling or swimming. Knowing your average pace helps you predict your final time for that race you are training for. It may also function as an indicator for personal growth. Understanding your pace is essential for structured training. Instead of just going “fast” or “slow,” pace allows you to target specific training zones:

• Easy exercise: slower pace to build endurance and aid recovery.
• Moderate/Tempo exercise: a good pace to keep for regular training.
• Fast exercise: to build speed and efficiency.
• Race pace: the exact pace you aim to maintain during the big race day.

By controlling your pace, you reduce the risk of overtraining and improve consistency, which is key to long-term progress.

Formulas

Calculate pace from time and distance

The text uses kilometers instead of miles, but the same principle can be applied for miles

Distance = 10 kilometers

Time in hours = 1:05:12

Time in seconds = 1hour*60*60 + 5minutes*60 + 12seconds = 3912 seconds.

Time in minutes = 3912s / 60 = 65.2 minutes

Divide both numerator and denominator with 10 to get the minutes per kilometer

This results in 6.52 minutes per kilometer.

To convert the decimal to time-readable notation (mm:ss) the decimal is multiplied by 0.6: 0.52*0.6 = 0.312

The pace in mm:ss notation is 6:31 min/km.

Calculate pace from speed and vice versa

You may know your speed (12km/h) but not your pace (5min/km). For the sake of simplicity kilometers are used, but the same principle holds for miles. Speed and pace are each others reciprocal, also known as inverse. This is because speed = distance / time and pace = time / distance.

Example

Speed = 12km/h

1 hour = 60 minutes

12km/h = 12km/60min

Divide both numerator and denominator with 12 to get per how many minutes one kilometer is traveled = 1km/5min.

Pace is the reciprocal of speed and thus pace = 5min/km.

How to Improve Running Pace?

The pace is usually the metric to quantify performance, which is heavily influenced by fitness metrics such as your VO₂ max , lactate threshold and running economy (Sloth et al., 2013; Casado et al., 2021). These metrics can be improved with the right type of training.

Research shows that VO₂ max, the maximum oxygen uptake of your body at any given time, increases most effectively with high-intensity interval training (HIIT) (Sloth et al., 2013; Milanović, Sporiš & Weston, 2015). Endurance training also plays a role, but HIT seems to be the most efficient method to increase your VO₂ max. HIIT refers to any workout where you alternate short bursts of high effort (fast pace) with periods of rest or lower intensity (low pace).

Lactate, often called lactic acid, is a byproduct of breaking down glucose for energy, especially when oxygen supply cannot keep up with demand (Faude, Kindermann & Meyer, 2009; Vijay et al., 2024). Usually, lactate is cleared by the body, but at a certain point, the accumulation of this byproduct is too large which creates fatigue, forcing you to slow down. This inflection point is called the lactate threshold; the exercise intensity in which the lactate accumulates faster than it can be cleared or reused as energy.

Lactate thresholds can be increased with LT training (Vijay et al., 2024). LT training requires exercising for 0.5-2 hours at an intensity that is just above the lactate threshold. This requires a moderate pace which should feel comfortably intense.

Finally, running economy refers to the efficiency with which your body uses oxygen to maintain a specific running pace (Barnes & Kilding, 2015). It is measured in ml/kg/km, with lower values meaning less oxygen use, and thus a better economy. There are many ways to improve running economy. One meta-review with many citations points to training at near-maximal and even higher intensities for the greatest effect (Barnes & Kilding). They also state that the consumption of beetroot juice can be beneficial in improving running economy. Another, more recent meta-review of randomized controlled trials shows that especially high-intensity interval training is a great way to improve your running economy (Feng et al., 2025).