Mile Pace Calculator
Instantly convert between per-mile pace, per-km pace, and speed — with a per-400m track lap equivalent.
Toggle between mph and km/h depending on what your treadmill shows.
Pace
= 5:36 /km
Intermediate mile pace at 9:00 (5:36).
Speed (mph)
6.67mph
Speed (km/h)
10.73km/h
Per 400 m
2:14/400m
Quarter-mile splits
Even-paced splits at the four ¼-mile checkpoints.
| Quarter | Split time | Cumulative |
|---|---|---|
| 1 | 2:15 | 2:15 |
| 2 | 2:15 | 4:30 |
| 3 | 2:15 | 6:45 |
| 4 | 2:15 | 9:00 |
Instantly convert between per-mile pace, per-km pace, and speed (mph/km/h). Enter any one value to see the others — including a per-400m lap equivalent. Pace and speed are inverses of each other; this tool handles the arithmetic in both directions so you can plan a training session on a track, configure a treadmill in mph or km/h, or compare a race split against a goal time without juggling conversion factors. The conversion factor between miles and kilometers is fixed at 1.60934 — multiplying minutes per mile by 0.621371 yields minutes per kilometer.
pace_km = pace_mi × 0.621371 · speed_mph = 60 ÷ pace_mi_min- pace_mi
- = Pace in minutes per mile (decimal minutes)
- pace_km
- = Pace in minutes per kilometer
- speed_mph
- = Speed in miles per hour
- speed_kmh
- = Speed in kilometers per hour
- 0.621371
- = Kilometers per mile inverse (1 ÷ 1.60934)
Worked example — 9:00/mi
- pace_mi = 9.000 min/mi
- pace_km = 9.000 × 0.621371 = 5.592 min/km → 5:35/km
- speed_mph = 60 ÷ 9.000 = 6.67 mph
- speed_kmh = 60 ÷ 5.592 = 10.73 km/h
- per 400m = 5.592 × 0.4 = 2.237 min → 2:14
- = 9:00/mi = 5:35/km = 6.67 mph = 10.73 km/h = 2:14/400m
Formula F2 from site/03-globals.md §formulas. The mile-to-kilometer factor 1.60934 is the defined international mile (1609.344 m). Every conversion here is reversible: enter km pace, mph, or km/h to see the equivalents.
| min/mi | min/km | mph | km/h |
|---|---|---|---|
| 4:30 | 2:48 | 13.33 | 21.45 |
| 5:00 | 3:06 | 12.00 | 19.31 |
| 5:30 | 3:25 | 10.91 | 17.56 |
| 6:00 | 3:44 | 10.00 | 16.09 |
| 6:30 | 4:02 | 9.23 | 14.86 |
| 7:00 | 4:21 | 8.57 | 13.79 |
| 7:30 | 4:40 | 8.00 | 12.87 |
| 8:00 | 4:58 | 7.50 | 12.07 |
| 8:30 | 5:17 | 7.06 | 11.36 |
| 9:00 | 5:35 | 6.67 | 10.73 |
| 9:30 | 5:54 | 6.32 | 10.16 |
| 10:00 | 6:13 | 6.00 | 9.66 |
| 10:30 | 6:31 | 5.71 | 9.19 |
| 11:00 | 6:50 | 5.45 | 8.78 |
| 11:30 | 7:09 | 5.22 | 8.39 |
| 12:00 | 7:27 | 5.00 | 8.05 |
| 13:00 | 8:04 | 4.62 | 7.43 |
| 14:00 | 8:42 | 4.29 | 6.90 |
| 15:00 | 9:19 | 4.00 | 6.44 |
| 16:00 | 9:56 | 3.75 | 6.04 |
Pace and Speed: Two Sides of One Coin
Pace (min/mi or min/km)
- Time per unit of distance — lower is faster
- Standard on road races, club runs, most GPS watches
- Easier to pace splits: 5K at 9:00/mi → 5:35 × 5 = 27:55
- What pacers carry on race-day pulse bands
- Preferred idiom for training plans and run-leader callouts
Use pace when planning splits, writing a pace band, or reading a race clock.
Speed (mph or km/h)
- Distance per unit of time — higher is faster
- Native unit of treadmills, bike computers, gym consoles
- Easier for intensity comparison: 6.0 mph is clearly slower than 8.0 mph
- How most cardio equipment displays effort
- Useful for interval machines with fixed-speed buttons
Use speed when configuring a treadmill or comparing cardio machines.
From Pace to Treadmill Speed
Slow run — 5.0 mph
Equivalent to 12:00/mi (7:27/km). A conversational easy-run pace for most recreational runners and a common starting point on the first treadmill interval of the week.
Medium run — 6.5 mph
Equivalent to 9:14/mi (5:44/km). Roughly marathon pace for a sub-4-hour runner. Sustainable for 30–60 minutes with easy breathing.
Fast run — 8.0 mph
Equivalent to 7:30/mi (4:40/km). Tempo to 10K pace for an intermediate runner. Treadmill intervals in this range target threshold.
Track Lap Equivalents (400 m)
- 4:00/mi
- 1:00/lapWorld-class 5K to 10K race pace
- 5:00/mi
- 1:15/lapCompetitive high-school mile
- 6:00/mi
- 1:30/lapSub-16 5K pace
- 7:00/mi
- 1:44/lapSub-22 5K pace
- 8:00/mi
- 1:59/lapSub-25 5K pace
- 9:00/mi
- 2:14/lapSub-2:00 half marathon pace
- 10:00/mi
- 2:29/lapSub-4:22 marathon pace
- 12:00/mi
- 2:59/lapJog / run-walk transition zone
Explore More Running Tools
Pace Calculator (homepage)
The full pace-time-distance tool — any two inputs return the third.
Treadmill Pace Calculator
Treadmill belt speed, grade, and the pace the machine is actually running.
5K Pace Calculator
5K-specific pacing, splits, and realistic goal bands.
Running Pace Calculator
Any-distance pace, splits, and training-zone guidance.
Sources
- 1.Pace and Speed Conversion (F2) — Inverse kinematic identity — PaceSplit Methodology (accessed 2026-04-21)
- 2.International Mile (1609.344 m) — Weights and Measures Act — NIST (accessed 2026-04-21)
- 3.Track and Field — 400 m Standard Lap — World Athletics (IAAF) (accessed 2026-04-21)