Half Marathon Pace Calculator
Ready to calculate
How it Works
01Pick Mode
Finish time → pace, or pace → finish time. Works both directions.
02Enter Target
Goal time (2:00, 1:45, sub-1:30) or target pace (8:00/mi, 5:00/km).
03Pace + Speed
Pace per mile, per km, speed in mph & km/h — all at once.
04Full Splits
Mile and km splits to race day, plus your goal level vs world record.
What is a Half Marathon Pace Calculator?
A half marathon pace calculator instantly converts between your finish time goal and the pace per mile (or per kilometer) you need to hold — plus full mile-by-mile and km-by-km splits. Half marathon distance is 13.1094 miles (21.0975 km), so even a few seconds per mile compound into minutes at the finish line.
Whether you are chasing sub-2:00 (9:09/mi), sub-1:45 (8:01/mi), sub-1:30 (6:52/mi), or sub-1:15 (5:43/mi), this calculator shows exactly where you need to be at every mile marker. It also flips the other direction — enter a pace, get the finish time.
Whether you are chasing sub-2:00 (9:09/mi), sub-1:45 (8:01/mi), sub-1:30 (6:52/mi), or sub-1:15 (5:43/mi), this calculator shows exactly where you need to be at every mile marker. It also flips the other direction — enter a pace, get the finish time.
How the Half Marathon Pace Calculator Works
Pick mode: Finish → Pace OR Pace → Finish. Toggle with one click.
Enter your target: Hours, minutes, seconds (goal time) — or pace per mile/km.
Get pace + speed: Pace per mile, per km, and speed in mph & km/h.
Full split table: Cumulative time at mile 1 through 13.1 and km 1 through 21.1 — race-day pacing built in.
Goal level: Nearest standard goal (sub-2, sub-1:30 etc.) + percent of world record.
Half Marathon Pace Formula
Pace per mile = Finish time (seconds) ÷ 13.1094
Pace per km = Finish time (seconds) ÷ 21.0975
Speed (mph) = 3,600 ÷ Pace per mile (seconds)
Finish time = Pace × 13.1094 (or × 21.0975 if pace is per km)
Common pace conversions: 6:00/mi ≈ 3:44/km, 8:00/mi ≈ 4:58/km, 9:09/mi ≈ 5:41/km (sub-2 pace).
Real-World Example
Example: Sub-2:00 Half Marathon Pace
Target: 2:00:00 finish time (7,200 seconds).
- Pace per mile = 7,200 ÷ 13.1094 = 549.3 sec = 9:09 min/mi
- Pace per km = 7,200 ÷ 21.0975 = 341.2 sec = 5:41 min/km
- Speed = 3,600 ÷ 549.3 = 6.55 mph ≈ 10.55 km/h
- Mile splits: 9:09 · 18:18 · 27:27 · 36:36 · 45:46 · 54:55 · 1:04:04 · 1:13:13 · 1:22:22 · 1:31:32 · 1:40:41 · 1:49:50 · 1:58:59 · finish 2:00:00
Who uses a half marathon pace calculator?
1
First-time half marathoners planning a target finish and pacing strategy.
2
Experienced runners chasing PRs — sub-2:00, sub-1:45, sub-1:30, sub-1:15.
3
Running coaches building mile-by-mile pace bands for athletes.
4
Race-day runners printing splits on a pace band or wrist sleeve.
5
Treadmill runners converting between mph, km/h, and min/mi to set the pace.
Half Marathon Pace Chart (Finish → Pace)
| Finish Time | Pace/Mile | Pace/KM | Level |
|---|---|---|---|
| 3:00:00 | 13:44 | 8:32 | Walk-run beginner |
| 2:30:00 | 11:27 | 7:07 | Beginner runner |
| 2:15:00 | 10:18 | 6:24 | Middle of pack |
| 2:00:00 | 9:09 | 5:41 | Sub-2 classic goal |
| 1:45:00 | 8:01 | 4:59 | Strong amateur |
| 1:30:00 | 6:52 | 4:16 | Sub-1:30 advanced |
| 1:15:00 | 5:43 | 3:33 | Competitive |
| 1:00:00 | 4:35 | 2:51 | Sub-elite / pro |
| 57:30 | 4:23 | 2:44 | World record (Kejelcha, 2024) |
Key Takeaways
This half marathon pace calculator is the fastest way to turn a finish-time goal into a race-day split plan — or to see what goal your current training pace actually puts you at. Enter your target and print the splits.
Half Marathon Pace FAQs
What pace do I need to run a sub-2 half marathon?
A sub-2:00 half marathon requires holding 9:09 per mile or 5:41 per km for the full 13.1 miles. This is roughly 6.55 mph on a treadmill. Sub-2 is the most common amateur goal — it represents a committed runner who trains 3-4x per week with at least one long run of 10+ miles.
What is a good half marathon time?
Depends on gender, age, and experience. General benchmarks: 2:30+ is a first-time finisher goal, 2:00 is the classic intermediate target, 1:45 is a strong amateur, 1:30 is advanced, 1:15 is competitive, and under 1:10 is sub-elite. Women's times typically run 10-15 minutes slower at the same training level.
How do I calculate my half marathon pace?
Divide your target finish time (in seconds) by 13.1094 to get pace per mile, or by 21.0975 to get pace per km. Or enter a target pace and multiply by 13.1094 to project your finish time. This calculator does both directions instantly with full split tables.
How many miles is a half marathon?
A half marathon is exactly 13.1094 miles, or 21.0975 km. Officially it is half of 42.195 km (the full marathon distance). On pace bands and race clocks, the 13.1-mile point is what finally gets you to the finish line after 21 km markers.
What pace is sub-1:30 half marathon?
Sub-1:30 requires 6:52 per mile or 4:16 per km for all 13.1 miles. Speed: 8.74 mph / 14.07 km/h. This is an advanced amateur goal requiring high weekly mileage (40+ mpw), structured speed work (tempo runs, intervals), and at least 6-12 months of consistent training.
How fast is a 1:15 half marathon?
A 1:15:00 half marathon requires 5:43 per mile / 3:33 per km — roughly 10.48 mph / 16.86 km/h. This is a competitive time — typically top 5-10% at major races. Usually only elite amateurs and sub-elite pros hit it.
Should I run even splits or negative splits?
Negative splits (running the second half slightly faster) is the safest strategy for most runners — start 5-10 seconds/mile slower than goal pace, then build. Even splits work if you are experienced. Positive splits (starting faster) almost always end in a crash — avoid.
How do I convert half marathon pace to treadmill speed?
Use pace per mile ÷ 60 to get miles per minute, then multiply by 60 for mph. Or: Speed (mph) = 60 ÷ pace in minutes per mile. For 9:09/mi: 60 ÷ 9.15 = 6.56 mph. This calculator shows speed in mph and km/h instantly so you can set the treadmill directly.
What is the world record for half marathon?
The men's world record is 57:30 set by Yomif Kejelcha (Ethiopia) in Valencia, October 2024 — that is 4:23 per mile or 2:44 per km. The women's world record is 1:02:52 by Letesenbet Gidey (Ethiopia) in 2021. Both hold the records under World Athletics-certified courses.
How far in advance should I do my last long run before a half marathon?
Most coaches recommend your last long run of 10-13 miles be 2-3 weeks before race day. The final week is a taper — 40-50% of normal mileage. Race-day plan should come from calculator-based splits, not a last-minute hero workout. Consistent pacing beats pushing too hard in the final week.
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Disclaimer
Pace estimates assume consistent splits. Real-race pace varies with terrain, weather, fueling, and pacing strategy. Treat these as targets, not guarantees.