Run your half marathon at a pace you can hold for 13.1 miles, usually close to your 10K pace plus 15–35 seconds per mile.
A half marathon asks for steady work: hard enough to feel like you’re racing, calm enough to stay in control. The sweet spot is your “all-day strong” pace. When you pick it well, you finish the last 5K still pressing.
If you’ve been typing “how fast should i run my half marathon?” into search, you’re not alone. The tricky part is that speed depends on your current fitness, the course, the weather, and how you fuel. This guide gives you a clean way to set a target pace, plus a plan to hold it on race day.
Start With Your Goal Time And The Matching Pace
Your goal time sets your average pace. You’ll drift a little faster on downhills and a little slower on climbs or at aid stations, then you pull it back.
| Goal Time | Avg Pace Per Mile | Avg Pace Per Km |
|---|---|---|
| 1:20:00 | 6:06/mi | 3:48/km |
| 1:25:00 | 6:29/mi | 4:02/km |
| 1:30:00 | 6:52/mi | 4:16/km |
| 1:35:00 | 7:15/mi | 4:30/km |
| 1:40:00 | 7:38/mi | 4:44/km |
| 1:45:00 | 8:01/mi | 4:59/km |
| 1:50:00 | 8:24/mi | 5:13/km |
| 2:00:00 | 9:09/mi | 5:41/km |
| 2:10:00 | 9:55/mi | 6:10/km |
| 2:20:00 | 10:41/mi | 6:38/km |
| 2:30:00 | 11:27/mi | 7:07/km |
Use the table as a first pass. If your goal sits between rows, split the difference. If the paces feel far from your training runs, adjust the goal time instead of forcing the pace.
If your course has tight turns or gravel, expect slower splits and stay relaxed; effort matters more than pace.
How Fast Should I Run My Half Marathon? For Common Goal Times
The table above assumes the standard half marathon distance: 21.0975 km (13.1094 miles). World Athletics lists that distance on its Half Marathon discipline page. Your watch may read a bit longer from weaving and tangents, so aim for the pace, not the raw GPS distance.
Pick a goal you can back up with training. A “stretch” goal is fine, but it still needs evidence: a recent race, a solid long run, or repeatable workouts at the right effort.
Set Pace From A Recent 5K Or 10K
A recent 5K or 10K is the cleanest way to estimate half marathon pace. It captures your current speed, not the speed you had last year. If you don’t have a race, run a hard, even effort time trial on a flat route and treat it like a race.
Quick Conversions That Work For Most Runners
- From 10K pace: half marathon pace often lands around 15–35 seconds per mile slower than your 10K pace.
- From 5K pace: half marathon pace often lands around 45–75 seconds per mile slower than your 5K pace.
Two Numbers To Watch
Use average pace over 1 km or 1 mile laps; instant pace jumps around. If you track heart rate, watch for a steady rise at the same pace, a sign you started too hard.
Those ranges tighten as fitness rises and widen as fatigue resistance drops. If you fade hard in long runs, use the slower end. If you finish long runs with snap, use the faster end.
A Simple Check Using Breathing And Talk
At true half marathon effort, you can speak in short phrases, not full paragraphs. Your breathing is strong and steady. If you can chat easily, you’re undercooking it. If you can’t get out two or three words, you’re cooking too hot.
Use Training Runs To Confirm The Pace
Your race pace has to match what you can repeat in training. Two workouts tell the truth fast: a tempo run and a long run with a faster finish.
Tempo Run Marker
Try 20–40 minutes at a “comfortably hard” effort. Your half marathon pace is often close to the pace you can hold for that block without falling apart. If you can’t keep it steady, your race pace should be slower.
Long Run Finish Marker
On a long run of 10–12 miles, finish the last 2–4 miles at your planned race pace. If it feels like a brick wall, the pace is too ambitious. If it feels controlled, you’re in the zone.
Race Day Factors That Change Your Target
Even with a solid plan, the day can throw curveballs. You don’t need a fancy formula. You need a few simple adjustments that keep you from burning matches too early.
Heat And Humidity
Warm, sticky conditions raise effort at the same pace. If the heat index is high, slow down early and protect your finish. The National Weather Service publishes a Heat Index Chart that shows how temperature and humidity combine into “feels like.” Use it to decide if your goal pace needs a small haircut.
- If you feel overheated in the first 2 miles, back off 10–20 seconds per mile right away.
Hills And Wind
On hills, run by effort and let pace float. Push the crest, not the climb. In headwind, tuck behind another runner at a distance and keep cadence quick. On tailwind, don’t chase the clock; save that extra energy for the final miles.
Course Crowds And Tangents
Many races start packed. Don’t zigzag. Relax, hold your line, and let faster runners go. Every extra step adds up, so take clean corners and stay close to the shortest legal route.
A Pacing Plan For Mile 1 Through Mile 13
Your best shot is usually a slight negative split: start a hair slow, settle in, then squeeze the last 5K. It feels almost too easy early. That’s the point.
Miles 1–3: Settle, Don’t Show Off
Start 5–15 seconds per mile slower than goal pace. Let heart rate and breathing climb gradually. If you blast the first mile, you’ll pay for it at mile ten.
Miles 4–10: Lock In The Groove
Hold goal pace and keep it boring. Check your form: tall posture, relaxed shoulders, quick feet. Sip fluid as planned. Take gels on schedule if you use them in training.
Miles 11–13.1: Race With What You’ve Got Left
If you’re steady at mile 11, you can press. Add 3–8 seconds per mile faster, or keep the same pace and raise effort on small rises. If you’re wobbling, stay calm and keep moving; short strides beat a blow-up.
| What Happens | What To Do | Pace Change |
|---|---|---|
| Crowded first mile | Stay relaxed and hold your line | 5–15 sec/mi slower early |
| Long climb | Run by effort, shorten stride | Let pace drift slower |
| Downhill | Quick cadence, light feet | Free speed, no surge |
| Headwind stretch | Run tucked in, keep rhythm | Hold effort, pace may drop |
| Aid station | Grab, sip, keep moving | Small dip is fine |
| Side stitch | Exhale hard, ease 20–30 sec | Short reset, then return |
| Legs feel heavy at mile 10 | Focus on form and cadence | Stay near goal pace |
| Feeling strong at mile 11 | Press gradually, not all at once | 3–8 sec/mi faster |
Workouts That Teach Half Marathon Speed
You don’t get half marathon pace from random runs. You earn it by stacking workouts that build stamina, threshold strength, and fuel use. Keep them simple, then repeat them for a few weeks.
Tempo Blocks
- 3 x 10 minutes at tempo effort with 2 minutes easy jog
- 20–30 minutes steady tempo on a flat route
Tempo should feel firm but controlled. You finish tired, not trashed.
Half Marathon Pace Repeats
- 3 x 2 miles at planned race pace with 3 minutes easy jog
- 6 x 1 mile at race pace with 2 minutes easy jog
These teach rhythm. If you can’t hit the pace without straining, raise the recovery or slow the target.
Long Run With A Fast Finish
- 8 miles easy, then 3 miles at race pace
- 10 miles easy, then 2 miles a touch faster than race pace
This is where you learn to run strong on tired legs, which is the whole job of the race.
Fueling And Hydration Without Guesswork
Most runners race a half marathon for 70–150 minutes. That’s long enough to run low on carbs. Practice fuel in training so your stomach isn’t surprised on race day.
- If your runs last over 75–90 minutes, try one gel or chew serving during the run.
- Drink small sips at aid stations. Big gulps often lead to sloshing.
- Don’t try a new drink mix on race day.
Going out too fast makes fueling feel harder. When pace is under control, your gut usually behaves better.
Race Week Checklist That Protects Your Pace
Three Things To Do In The Final Seven Days
- Sleep well.
- Eat normal meals with a bit more carbs the last two days. No strange “loading” stunts.
- Do one short workout: 20–30 minutes easy with 4–6 short strides.
Race Morning Pacing Cues
- Warm up with easy jogging and drills, then stop before you sweat buckets.
- Start calm. Your watch may read fast in the first mile from GPS noise.
- Run the plan. If you feel great early, save that grin for mile 11.
Make Your Final Pace Call In Two Minutes
Before you commit, answer three questions: Can you hit this pace in training? Can you hold it when the course bites back? Can you finish the last 5K with a little push? If the answer is yes, you’ve got a smart target.
Still wondering “how fast should i run my half marathon?” Circle back to your recent 10K or tempo pace, then choose the slow end of the conversion range if conditions are rough.