How to Run a Sub-2 Half Marathon (and Sub-1:45 or Sub-1:30)
A sub-2 half marathon is the big goal for many runners after their first half. It means holding 5:41 per kilometer for 21.1 km, and the difference between making it and finishing in 2:03 usually comes down to pacing and fueling more than fitness. In this guide I explain when it is realistic to go for it, what paces to train at, what a typical week looks like and how to run the race so you don’t fall just short. At the end you will also find the paces for sub-1:45 and sub-1:30.
When a sub-2 half marathon is realistic
If you have already run a half marathon around 2:05 or 2:10, or have a 10K of about 54 minutes, the goal is within reach with 10 to 12 weeks of training. According to Peter Riegel‘s formula, a 2-hour half marathon is equivalent to a 10K of about 54 and a half minutes.
You can check where you stand with the race time predictor. If your 10K is above 57 minutes, focus on improving it first; the guide on how to run a sub-50 10K works as a base.
Your paces for a sub-2 half marathon
| Session type | Approximate pace |
|---|---|
| Easy run | 6:35 to 6:55 /km |
| Half marathon pace | 5:35 to 5:40 /km |
| Threshold or tempo | 5:30 to 5:35 /km |
| Intervals (1,000 to 2,000 m) | 5:05 to 5:15 /km |
To give yourself a margin, train your goal pace at 5:35-5:40 rather than exactly 5:41. If you want to fit the paces to your actual times, use the training pace calculator.
How to train for a sub-2 half marathon
A typical week
Four days a week is enough. For example: an easy run, a quality session, another easy run and the long run. As a reference, 30 to 40 km a week in your biggest weeks, with a lighter week every three or four.
Most of your volume is at an easy pace. If you find it hard to go slowly, the guide on how to train in zone 2 explains why it pays off.
The long run
Build it up gradually to 16 to 18 km, and in some of the last ones add a final block of 4 to 6 km at half marathon pace. That teaches you to hold the pace on tired legs, which is what happens after kilometer 15 on race day.
Quality sessions
Alternate two types. Threshold sessions, like 3 x 10 minutes at 5:30-5:35 with 2 easy minutes, improve your ability to hold that pace. Intervals, like 5 x 1,000 m at 5:05-5:10 with 2 minutes of jogging, make race pace feel easier. In the final weeks, a session of 2 x 5 km at half marathon pace with 3 minutes of recovery is a good test. There are more ideas in the 10K interval workouts.
Eating and drinking for a sub-2 half marathon
In a half marathon of almost two hours, fueling counts. A gel or sports drink around kilometer 8 or 10 helps you hold your pace in the final third. Work out how much you need with the race carb calculator and test it on your long runs. If gels upset your stomach, read the guide on how to train your gut.
Have breakfast about three hours before, rich in carbs. The details are in the guide on what to eat before a race.
How to race a sub-2 half marathon
GPS watches usually measure a bit more distance than the real course, because it is impossible to run the perfect line through every bend. So if your watch says 5:41, you are probably going slightly slower. Aim for 5:35-5:38 on your watch.
Start under control: the first 5 km between 28:00 and 28:30, without getting carried away. Go through 10K at around 56:30 and, if you feel good, push from kilometer 15. If there are 1:59 or 2:00 pacers, run with them, but don’t fight to stay glued to them at a crowded start. Pick a flat race in the race directory.
And cut your volume in the last two weeks. Arriving rested is worth more than any last-minute workout.
If your goal is sub-1:45 or sub-1:30
| Goal | Race pace | Equivalent 10K | Easy run | Threshold | Intervals |
|---|---|---|---|---|---|
| Sub-2:00 | 5:41 /km | ~54:20 | 6:35-6:55 | 5:30-5:35 | 5:05-5:15 |
| Sub-1:45 | 4:58 /km | ~47:30 | 5:55-6:15 | 4:50-4:55 | 4:25-4:35 |
| Sub-1:30 | 4:16 /km | ~40:45 | 5:15-5:35 | 4:10-4:15 | 3:45-3:55 |
A sub-1:45 usually needs 40 to 50 km a week, and a sub-1:30 between 55 and 70 km, with long runs of up to 20 or 22 km.
Conclusion
A sub-2 half marathon is realistic if you have a 10K of about 54 minutes or a half close to 2:05. Train four days with most kilometers easy, take your long run to 16-18 km with a race-pace finish, do threshold and interval work, take a gel halfway and start under control. And remember that your watch usually reads long, so run a couple of seconds under goal pace. Choose well, run better.
Frequently asked questions
What pace do I need for a sub-2 half marathon?
An average of 5:41 per kilometer, but because GPS usually measures a bit long, aim for 5:35-5:38 on your watch.
What 10K time do I need for a sub-2 half marathon?
A 10K of about 54 minutes is the usual equivalent. If you are well above that, improve your 10K first.
How many kilometers a week do I need for a sub-2 half marathon?
As a reference, 30 to 40 km a week in your biggest weeks, spread over four days.
Do I need gels for a sub-2 half marathon?
They help a lot. A gel or sports drink around kilometer 8 or 10 gives you energy for the final third, which is where a sub-2 is won or lost.
What should my longest run be?
Between 16 and 18 km, with a final block at race pace in some of the last long runs.
