Running Pace Calculator
Calculate pace, speed, and race finish times
Enter your pace per mile or kilometer and instantly see your speed in mph/kph plus predicted finish times for 5K, 10K, half marathon, and marathon distances.
Most common answer: An 8:30/mile pace equals 5:17/km, 7.06 mph, and predicts finish times of 26:24 (5K), 52:48 (10K), 1:51:26 (half marathon), and 3:42:51 (marathon).
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- Easy runs should be 1-2 min/mile slower than race pace
- Do 80% of training at easy pace, 20% at tempo/interval pace
- Tempo runs should feel "comfortably hard" -- you can speak in short phrases
- For race day, start slightly slower than target pace and build
Running Pace Calculator
How to Use This Calculator
Enter your pace in minutes and seconds per mile or per kilometer. The calculator converts between pace and speed and estimates finish times for four common race distances.
Understanding Running Pace
Running pace is the time to cover one mile or one kilometer. Most runners use pace rather than speed because it is easier to track during a run using split times.
Race Distance Reference
| Race | Distance | Miles |
|---|---|---|
| 5K | 5,000 meters | 3.107 miles |
| 10K | 10,000 meters | 6.214 miles |
| Half Marathon | 21,097.5 meters | 13.109 miles |
| Marathon | 42,195 meters | 26.219 miles |
Pace Benchmarks
| Level | Pace/Mile | Marathon Time |
|---|---|---|
| Beginner | 10:00–12:00 | 4:22–5:15 |
| Intermediate | 8:00–10:00 | 3:30–4:22 |
| Advanced | 6:30–8:00 | 2:50–3:30 |
| Elite | Under 5:00 | Under 2:10 |
Sources
- Daniels, J. Daniels’ Running Formula, 3rd Ed.
- World Athletics — Official race distances and records
Medical disclaimer: Consult a physician before starting a running program.
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- Water Intake Calculator — Stay hydrated
- BMI Calculator — Check body mass index
よくある質問
A good beginner pace is 10:00-12:00 per mile (6:13-7:27 per km). The key indicator is being able to hold a conversation while running. If you can not talk comfortably, slow down. Most beginner programs (like Couch to 5K) start with walk-run intervals. As fitness improves over 8-12 weeks, pace naturally decreases. Do not compare your pace to others.
Speed (mph) = 60 / pace (in minutes). For example, an 8:00/mile pace = 60/8 = 7.5 mph. Speed (kph) = 60 / pace per km. For 5:00/km pace = 60/5 = 12 kph. Conversely, pace per mile = 60 / speed (mph). At 6.0 mph, your pace is 10:00/mile.
To finish a marathon in under 4 hours, you need an average pace of 9:09 per mile (5:41 per km). This equals 5.05 mph. Since most runners slow in the second half, you should be comfortable running 8:45-9:00/mile pace in training long runs. A 4-hour marathon is a common goal for intermediate runners and requires consistent training over 16-20 weeks.
Four proven methods: 1) Increase weekly mileage gradually (no more than 10% per week). 2) Add one speed workout per week (intervals or tempo runs). 3) Include one long run per week. 4) Maintain consistency over months. Most improvement comes from easy running volume, not speed work. The 80/20 rule: 80% of runs should be at easy pace, 20% at harder paces.
Pace is your speed per unit distance (e.g., 8:30/mile). A split is the actual time for a specific segment of a race. For example, your first mile split might be 8:15 and your second mile split 8:45, giving an average pace of 8:30/mile. Negative splits (running the second half faster) are generally the best race strategy.
Altitude: Expect 3-5% slower pace above 5,000 feet, increasing to 10-15% above 8,000 feet due to reduced oxygen. Full acclimatization takes 2-3 weeks. Heat: Expect 1-3% slower pace per 10 degrees F above 60 degrees F. At 80 degrees F, a 30-second per mile slowdown is normal. Humidity compounds the effect. Adjust expectations accordingly.
Average 5K finish time in the US is about 28-35 minutes. Good times by experience level: Beginner: 30-40 minutes (10:00-13:00/mile). Intermediate: 22-28 minutes (7:00-9:00/mile). Advanced: 18-22 minutes (5:48-7:00/mile). Elite: Under 15:00 for men, under 17:00 for women. Your personal best is what matters most.
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