Calculadora de Pace de Maratona
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
tempo = pace × 42,195 | pace_meta = meta / 42,195
About this calculator
The Marathon Pace Calculator is a practical tool for runners who want to estimate total race time based on average pace per kilometer. Simply enter your pace (minutes per km) and the calculator multiplies it by the official distance of 42.195 km, giving you the predicted time to complete the marathon. It helps with race strategy planning, setting realistic goals, and adjusting pace during training.
How it works: the formula is time = pace × 42.195. For example, if your pace is 5 min/km, the estimated time is 5 × 42.195 = 210.975 minutes, or about 3 hours and 31 minutes. The calculator also allows the reverse: given a target time, it calculates the required pace using pace_target = target / 42.195. This helps runners set clear objectives.
When to use? Mainly during marathon preparation to simulate different pace scenarios. Beginners can check if a pace is feasible, while experienced runners fine-tune race strategies. It is also useful for coaches planning pace-based workouts. The calculator is free and requires no registration, accessible to everyone.
Important caveats: the pace entered must be realistic and aligned with your fitness. The calculator does not account for factors like course elevation, weather conditions, or accumulated fatigue. Use it as a reference but adjust based on your experience from previous races. For more accurate calculations, consider an average pace you can sustain for 42 km.
Frequently asked questions
How do I calculate the average pace of a marathon I already ran?
Divide the total race time (in minutes) by 42.195. For example, if you finished in 3h30 (210 minutes), your average pace was 210 / 42.195 ≈ 4.98 min/km (approximately 5 min/km).
Does the calculator consider water breaks or bathroom stops?
No. The calculation assumes you maintain a constant pace throughout the race. Include stops manually in the total time or adjust the pace to a slightly higher value.
Can I use the calculator for half marathons or other distances?
Yes, but replace the distance. For half marathon (21.0975 km), use time = pace × 21.0975. The calculator is specific to marathons, but the principle is the same.
What is the difference between pace and speed?
Pace is the time to cover 1 km (min/km), while speed is distance per hour (km/h). The calculator uses pace, which is more common among runners.