Pace Calculator
Calculate running pace, average speed, finish times for 5K, 10K, half marathon, and marathon, and generate step-by-step split tables for any target distance.
| Split # | Distance | Split Time | Elapsed Time |
|---|---|---|---|
| 1 | 1 km | 05:00 | 05:00 |
| 2 | 2 km | 05:00 | 10:00 |
| 3 | 3 km | 05:00 | 15:00 |
| 4 | 4 km | 05:00 | 20:00 |
| 5 | 5 km | 05:00 | 25:00 |
| 6 | 6 km | 05:00 | 30:00 |
| 7 | 7 km | 05:00 | 35:00 |
| 8 | 8 km | 05:00 | 40:00 |
| 9 | 9 km | 05:00 | 45:00 |
| 10 | 10 km | 05:00 | 50:00 |
Avertissement : Cet outil est fourni à des fins de bien-être général et ne constitue pas un avis médical.
→ En savoir plus sur la vérification de nos formules dans notre Guide méthodologique.
Comment ça marche
Formule
Pace (min/km) = frac{Total Time (seconds)}{Distance (km) × 60}, Speed (km/h) = frac{Distance (km)}{Time (hours)} Exemple détaillé
Running 10 kilometers in 50 minutes results in an average pace of 5:00 /km (8:03 per mile) with an average running speed of 12.00 km/h.
Understanding Running Pace and Aerobic Performance
Whether training for your first 5K fun run, preparing to break the sub-4-hour marathon threshold, or pacing an interval workout on the track, mastering running pace is the foundation of endurance athletic development. Unlike cycling or driving where velocity is expressed in distance over time (km/h or mph), runners measure effort through pace: the time taken to cover one standard kilometer or mile.
Accurate pacing prevents starting too fast—the most common tactical mistake among marathoners and road racers.
Fundamental Mathematical Formulas
Pace and velocity are mathematical inverses:
1. Running Pace Formula
$$\text{Seconds Per Kilometer} = \frac{\text{Total Time Elapsed in Seconds}}{\text{Distance in Kilometers}}$$
$$\text{Pace (min:sec)} = \left\lfloor \frac{\text{Seconds/Km}}{60} \right\rfloor : (\text{Seconds/Km} \pmod{60})$$
2. Running Speed Formula
$$\text{Speed (km/h)} = \frac{\text{Distance (km)}}{\text{Time Elapsed (hours)}} = \frac{\text{Distance (km)}}{\text{Total Seconds}} \times 3600$$
$$\text{Speed (mph)} = \frac{\text{Speed (km/h)}}{1.609344}$$
Standard International Race Distances
Road racing bodies (World Athletics, USATF, AIMS) recognize standardized championship distances:
- 5K Road Race: $5.000\text{ km}$ ($3.107\text{ miles}$)
- 10K Road Race: $10.000\text{ km}$ ($6.214\text{ miles}$)
- Half Marathon: $21.0975\text{ km}$ ($13.109\text{ miles}$)
- Full Marathon: $42.195\text{ km}$ ($26.219\text{ miles}$)
Step-by-Step Worked Demonstration
Consider a runner aiming to complete a 10-kilometer road race in exactly $50\text{ minutes}$ ($3,000\text{ seconds}$):
-
Calculate Seconds Per Kilometer: $$\text{Pace} = \frac{3,000\text{ s}}{10\text{ km}} = 300\text{ seconds/km}$$
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Format in Minutes and Seconds: $$\lfloor 300 / 60 \rfloor = 5\text{ minutes}, \quad 300 \pmod{60} = 00\text{ seconds} \implies \mathbf{5:00\text{ /km}}$$
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Convert to Imperial Pace (min/mile): $$300 \times 1.609344 = 482.8\text{ seconds/mile}$$ $$\lfloor 482.8 / 60 \rfloor = 8\text{ minutes}, \quad 482.8 \pmod{60} \approx 03\text{ seconds} \implies \mathbf{8:03\text{ /mile}}$$
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Calculate Running Velocity: $$\text{Speed} = \frac{10\text{ km}}{50 / 60\text{ h}} = 10 \times 1.2 = \mathbf{12.00\text{ km/h}}\text{ (7.46 mph)}$$
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Extrapolated Finish Predictions:
- 5K: $5 \times 300\text{ s} = 1500\text{ s} \implies \mathbf{25:00}$
- Half Marathon: $21.0975 \times 300\text{ s} = 6329\text{ s} \implies \mathbf{01:45:29}$
- Marathon: $42.195 \times 300\text{ s} = 12658.5\text{ s} \implies \mathbf{03:30:59}$
Tactical Split Strategies
- Negative Splitting: Running the second half of your race 1% to 3% faster than the first half preserves muscle glycogen and optimizes cardiovascular cardiac output.
- Treadmill Calibration: Keep in mind that treadmill running lacks wind resistance. Setting treadmill incline to 1.0% approximates outdoor road energy expenditure.
To calculate the calories burned during your runs, explore our calorie burn calculator or establish your nutritional baseline using the calorie calculator.
Foire aux questions
What is the difference between pace and speed?
Speed measures distance covered per unit of time (e.g. kilometers per hour or miles per hour). Pace measures the exact time required to cover a fixed unit of distance (e.g. minutes and seconds per kilometer or per mile).
How do I convert min/km pace to min/mile?
One mile equals 1.609344 kilometers. Multiply your pace in seconds per kilometer by 1.609344 to obtain seconds per mile. For example, a 5:00/km pace (300 seconds) translates to 482.8 seconds, or approximately 8:03 per mile.
What is an even pacing strategy in long-distance running?
Even pacing means maintaining a constant time per kilometer throughout an entire race. Exercise physiology shows that even or slight negative splits (running the second half marginally faster) minimize glycogen depletion and reduce fatigue.
Can this calculator predict my marathon time accurately?
While simple linear extrapolation projects finish times assuming constant speed, real marathon performance depends on muscular endurance, hydration, course elevation, and carbohydrate fueling. Most runners experience a 5% to 8% pace fade past kilometer 30.
What is a good 5K running pace for beginners?
A comfortable recreational 5K time ranges between 30 and 40 minutes, which translates to a running pace between 6:00 and 8:00 minutes per kilometer.