Half Marathon Pace for 1 Hour 50 Minutes — 5:13 per km (8:23 per mile)
Half marathon pace for 1 hour 50 minutes — the answer is 5:13 per kilometre (8:23 per mile). Hold that pace from the start to the finish of the half marathon and you will cross the line in 1 hour 50 minutes. This page shows the exact arithmetic, the splits that keep you on target, what that pace feels like, and how to train for it.
There is exactly one pace that produces this finish time at this distance, because pace is time divided by distance and nothing else. The interesting questions are all around that number: how hard it feels, how evenly you can hold it, and what training makes it yours. The rest of this page answers those.
The half marathon is 21.0975 km — long enough that pacing discipline and fueling decide the result, short enough that a well-trained runner can race it hard from start to finish. Most runners' half marathon pace sits well below their 10K pace, and the gap between the two is a direct measure of aerobic endurance.
Work out your own pace
Use the half marathon pace calculator to check any target time at this distance — enter your goal and it returns the pace per kilometre and per mile, plus the splits. The general pace calculator does the same for any distance, and converts between pace, speed, and finish time. Pace itself is an exact calculation, so the tools agree with the figures on this page to the second.
The formula, shown and cited
Pace per kilometre = finish time ÷ distance (km)
Pace per mile = finish time ÷ distance (miles)
The distance used here is the official standard: the half marathon is 21.0975 km (13.11 miles), following the World Athletics standard distances — the marathon is 42.195 km and the half marathon 21.0975 km, and the shorter track distances are exact metric distances. One mile is 1.609344 km, which is why the per-mile pace is always slower numerically than the per-kilometre pace.
Working it through for this page:
1:50:00 ÷ 21.0975 km = 312.8 seconds per km = 5:13 per km
1:50:00 ÷ 13.11 miles = 503.5 seconds per mile = 8:23 per mile
Your average speed for the whole effort is 11.51 km/h (7.15 mph). Speed and pace are the same information expressed two ways — runners talk in pace because it maps directly onto splits and watch readings, while speed is what cyclists and the physics use. Neither is an estimate: given the distance and the time, both are exact.
Your splits for 1 hour 50 minutes
Even pacing at 5:13 per km gives these 5 km splits (with the final partial split at the finish):
| Distance | Cumulative time |
|---|---|
| 5 km | 26:04 |
| 10 km | 52:08 |
| 15 km | 1:18:12 |
| 20 km | 1:44:17 |
| 21.098 km | 1:50:00 |
Splits are the practical half of pacing. A watch showing 5:13 per kilometre tells you nothing unless you know the cumulative time you should see at each marker, and the table above is that checklist. The classic error at every distance is starting 10 to 15 seconds per kilometre too fast in the first quarter and paying for it twice over in the second half — even pacing, or a very slight negative split (second half a touch faster than the first), is the fastest way to hit a target time for almost every runner.
Start at target pace from the first kilometre — the opening kilometres should feel almost too easy, and the first 5 km split is the one most runners get wrong. Take water at the early stations even if you do not feel thirsty, and if you are racing for a time, take a gel at around 45 to 60 minutes. Hold the pace through 15 km, then race the last 6 km: if you have paced well, the final stretch is where the time is made, not where it is lost.
What 5:13 per km means
This is a strong club pace — it takes regular training and a solid aerobic base to hold it for the full distance. In training terms, your easy running should sit around 6:28 per km (roughly 60 to 90 seconds per km slower than this target), your tempo running around 5:33 per km, and your interval work faster than target pace in short repetitions with full recoveries. Those three gears are the whole of a training week: easy volume builds the aerobic base, tempo work lifts the speed you can sustain, and intervals lift the ceiling.
| Training zone | Pace per km | Pace per mile |
|---|---|---|
| Easy | 6:28 | 10:24 |
| Steady | 5:58 | 9:36 |
| Tempo | 5:33 | 8:56 |
| Interval | 4:58 | 7:59 |
As a cross-check, the Riegel formula (Riegel, 1981: predicted time = known time × (new distance ÷ known distance)^1.06) translates this performance to other distances, assuming equal fitness and similar conditions: about 23:55 for 5K, 49:51 for 10K, and 3:49:21 for a marathon. Treat those as estimates, not promises — Riegel is least reliable when the jump in distance is large, and it says nothing about whether you have done the long runs this distance actually requires.
| Distance | Riegel prediction |
|---|---|
| 5K | 23:55 |
| 10K | 49:51 |
| marathon | 3:49:21 |
How to train for this target
Build the week around one long run, one quality session, and easy days. The long run should reach 18 to 21 km at easy pace, with the last three long runs including 20 to 30 minutes at target pace so the effort feels familiar. The quality session alternates weekly between tempo running — 20 minutes continuous at tempo pace — and intervals such as 5 × 1 km at target pace with 90 seconds of jogging recovery. Add two or three easy runs of 30 to 45 minutes between the hard days, and keep at least one full rest day a week. Increase total weekly volume by no more than about 10% a week, and cut volume by 30 to 40% in the final week before the race (the taper). Strength work twice a week — squats, lunges, calf raises, core — supports the running without replacing it.
On race day, eat a familiar breakfast two to three hours beforehand, sip water rather than gulping it, and start at 5:13 per km from the first step. For efforts over 75 minutes, practise taking on carbohydrate during the long runs — roughly 30 to 60 g per hour — because the gut needs training just like the legs. And remember the safety frame for everything on this site: training targets are estimates, not medical advice, and daily intakes below 1,200 kcal (women) or 1,500 kcal (men) need medical supervision.
What the pace does NOT tell you
Pace is exact, but it is not the whole story. The same pace feels very different on a flat road, a hilly course, a hot day, or into a headwind — heat alone can add 10 to 30 seconds per kilometre, and hills more. Course measurement also matters: a GPS watch typically reads 1 to 2% long on a twisty course, so a watch pace can look slower than the official chip time suggests. Trust the course markers and the table above over the watch when they disagree.
Pace also says nothing about how you got there. Two runners can hold 5:13 per km with very different heart rates, cadences, and fuel needs, and the Riegel equivalents above assume equal fitness across distances — a sprinter's 5K does not predict their marathon, and a marathoner's 800 m is a poor guide to their 5K. Finally, a target time is a goal, not a verdict: missing it by a minute after a well-run race is a training signal, not a failure, and the right response is to look at the splits, find where it slipped, and adjust the next block.
Related pages
- Pace hub
- Half Marathon Pace for 1 Hour 45 Minutes — 4:59 per km (8:01 per mile)
- Marathon Pace for 3 Hours — 4:16 per km (6:52 per mile)
Frequently asked questions
What pace do I need for the half marathon in 1 hour 50 minutes?
5:13 per kilometre, which is 8:23 per mile. That is the exact figure: 1:50:00 divided by 21.0975 km. Hold it evenly and you finish in 1 hour 50 minutes; the splits table above shows the cumulative time to expect at each marker.
Is 5:13 per km fast?
It is a strong club pace. For context, easy running for a runner targeting this time would be around 6:28 per km, and tempo running around 5:33 per km. Whether it feels fast depends on your current fitness — compare it with your recent race paces rather than with anyone else's.
What should my 5K time be if I can run the half marathon in 1 hour 50 minutes?
The Riegel formula predicts about 23:55 for 5K from this performance, and about 49:51 for 10K. Those are estimates assuming equal fitness and similar conditions; the further the distance from your known result, the less reliable the prediction.
How do I pace the half marathon so I hit 1 hour 50 minutes?
Run even splits at 5:13 per km, using the cumulative times in the table above at each marker. Do not start faster — the first kilometre should feel almost too easy. If you are a few seconds slow at halfway, correct by a few seconds per kilometre, not with a sudden surge.
What training do I need to run 5:13 per km for the half marathon?
A week with one long run, one tempo or interval session, easy runs between, and one rest day, built over 8 to 12 weeks with volume rising by about 10% a week. Include 20 to 30 minutes at target pace inside the long run in the final weeks, and taper in the last week.
What should I eat and drink during a 1 hour 50 minutes half marathon?
Take water at the early stations even if you do not feel thirsty, and a gel at around 45 to 60 minutes — roughly 30 to 60 g of carbohydrate per hour once you pass 75 minutes, which a 1 hour 50 minutes half marathon just reaches. Practise the exact products on your long runs, because a gel you have never tried is a risk, not a boost.
Estimates only, not medical advice. Minimum safe intakes: 1,200 kcal/day women, 1,500 kcal/day men — consult a healthcare professional before a very-low-calorie diet.