Calculadora de Pace de Meia Maratona
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
tempo = pace × 21,0975 | pace_meta = meta / 21,0975
About this calculator
The Half Marathon Pace Calculator is a practical tool for runners who want to plan their performance over 21.0975 km. You can enter your average pace (minutes per kilometer) and get the estimated total time to complete the race. It also works the other way: set a target time and discover the pace to maintain. The formula is simple: total time (in minutes) equals pace multiplied by distance; for target pace, divide total time by distance.
This calculator is useful in many scenarios. For example, when training for a half marathon, you can test different paces and see how they affect the final result. Experienced runners use it to adjust race strategies, setting realistic paces based on previous training. Beginners also benefit by understanding the relationship between pace and time, avoiding starting too fast and struggling at the end.
When using the calculator, remember that pace is an average. In real races, factors like terrain, weather, hydration, and fatigue can cause your pace to vary. So, consider the result as a reference, not a guarantee. Adjust your pace according to the day's conditions and your physical preparation. A good practice is to train at paces close to the calculated one to increase confidence.
Another important caution: the calculator assumes you maintain a constant pace throughout the entire distance. In practice, this is difficult, especially in the first kilometers (when adrenaline is high) and the last ones (when fatigue sets in). Plan a race strategy, such as starting slightly slower and gradually speeding up, to optimize your performance.
Frequently asked questions
What is the exact distance of a half marathon?
A half marathon is 21.0975 kilometers, exactly half of a full marathon (42.195 km).
How do I calculate my ideal pace for a half marathon?
Set a target time for the race. Divide that time (in minutes) by 21.0975 to get the pace in minutes per kilometer. For example, for 1h45min (105 minutes), the pace is approximately 4:58/km.
Can I use this calculator for interval training?
No, it is designed for constant pace over a fixed distance. For interval training, use a specific calculator that accounts for rest periods.
Is the result from the calculator guaranteed?
No. The calculation is theoretical and does not consider variables like fatigue, hills, weather, or hydration. Use it as a reference and adjust your strategy during the race.
What is the difference between pace and speed?
Pace is the time per kilometer (e.g., 5:00/km). Speed is the distance per hour (e.g., 12 km/h). The calculator uses pace, which is more common among runners.