Half Marathon Pace Chart

21.0975 KM · 13.1094 MI

Half Marathon Pace Chart

Choose a goal. Get the exact pace, every split, and a race-day plan you can print or share.

Target finish time
Quick goals
Fine tune

Runs in your browser. No account. Works offline after first visit.

Target finish

HALF · 21.1K
1:45:00
Primary pace 4:59/km
Also 8:01/mi
Halfway
52:30
10K
49:46
Speed
12.1 km/h
Half marathon course markers A horizontal race line from the start through 5K, 10K, 15K, 20K, and the finish.

Displayed pace is rounded to the nearest second. Every split uses the exact pace.

YOUR RACE PLAN

Shape the effort, then carry it with you.

Pace profile

Even split

4:59/km
Pace profile across the half marathon An even pace of 4 minutes 59 seconds per kilometer from start to finish.
Start around 4:59/km and finish around 4:59/km. The curve is continuous; the plan never jumps suddenly at halfway.
  1. 5K24:53
  2. 10K49:46
  3. Halfway52:30
  4. 15K1:14:39
  5. 20K1:39:32
  6. Finish1:45:00

RACE SPLITS

Check the clock at the markers you will actually see.

Marker Segment Target pace Elapsed
5 km 24:53 4:59/km 24:53
10 km 24:53 4:59/km 49:46
15 km 24:53 4:59/km 1:14:39
20 km 24:53 4:59/km 1:39:32
Finish 5:28 4:59/km 1:45:00

QUICK REFERENCE

Half marathon finish time by pace

Choose any finish time to load it into the calculator. Every row uses the exact 21.0975 km distance.

Half marathon target times from 1:10 to 3:30 in five-minute steps
Finish Pace /km Pace /mile 5K 10K Halfway
3:19/km 5:20/mi 16:35 33:11 35:00
3:33/km 5:43/mi 17:46 35:33 37:30
3:48/km 6:06/mi 18:58 37:55 40:00
4:02/km 6:29/mi 20:09 40:17 42:30
4:16/km 6:52/mi 21:20 42:40 45:00
4:30/km 7:15/mi 22:31 45:02 47:30
4:44/km 7:38/mi 23:42 47:24 50:00
4:59/km 8:01/mi 24:53 49:46 52:30
5:13/km 8:23/mi 26:04 52:08 55:00
5:27/km 8:46/mi 27:15 54:31 57:30
5:41/km 9:09/mi 28:26 56:53 1:00:00
5:55/km 9:32/mi 29:37 59:15 1:02:30
6:10/km 9:55/mi 30:49 1:01:37 1:05:00
6:24/km 10:18/mi 32:00 1:03:59 1:07:30
6:38/km 10:41/mi 33:11 1:06:22 1:10:00
6:52/km 11:04/mi 34:22 1:08:44 1:12:30
7:07/km 11:27/mi 35:33 1:11:06 1:15:00
7:21/km 11:49/mi 36:44 1:13:28 1:17:30
7:35/km 12:12/mi 37:55 1:15:50 1:20:00
7:49/km 12:35/mi 39:06 1:18:12 1:22:30
8:03/km 12:58/mi 40:17 1:20:35 1:25:00
8:18/km 13:21/mi 41:28 1:22:57 1:27:30
8:32/km 13:44/mi 42:40 1:25:19 1:30:00
8:46/km 14:07/mi 43:51 1:27:41 1:32:30
9:00/km 14:30/mi 45:02 1:30:03 1:35:00
9:15/km 14:52/mi 46:13 1:32:26 1:37:30
9:29/km 15:15/mi 47:24 1:34:48 1:40:00
9:43/km 15:38/mi 48:35 1:37:10 1:42:30
9:57/km 16:01/mi 49:46 1:39:32 1:45:00

HOW IT WORKS

One target. Three useful outputs.

  1. 01

    Set the clock

    Enter a finish time or the pace you can hold. The calculator solves the other value using the full half marathon distance.

  2. 02

    Shape the race

    Stay even, or move a small share of time into the first half to create a continuous negative split.

  3. 03

    Take the plan

    Use kilometer or mile markers, then share, download, print the full chart, or make a narrow pace band.

Exact distance, exact finish

A half marathon is exactly 21.0975 kilometers, or about 13.1094 miles. The calculator keeps full precision internally, so rounded display pace never changes your finish target.

Distance reference: World Athletics

How the split curve works

Even pacing uses one constant pace. Negative or positive splits use a linear pace curve that satisfies both your chosen halfway clock share and your exact finish time.

What stop buffer means

A stop buffer reserves clock time for aid stations or brief pauses. It is distributed by distance for planning; your actual stops may happen at different points on the course.

Common pace-chart questions

What pace is a 2-hour half marathon?

A 2:00:00 half marathon requires an exact average of about 5:41 per kilometer or 9:09 per mile. Use the 2:00 quick goal above to generate every split.

Why does multiplying the displayed pace sometimes miss by a few seconds?

The displayed pace is rounded to a whole second. The split engine keeps the unrounded pace, so its finish time stays exact even when the visible pace is one second higher or lower.

Should I use even or negative splits?

Even splits are the simplest plan. A negative split starts slightly slower and finishes faster. Choose a profile you have practiced and adjust for the real course, conditions, and how you feel on race day.

Can I use this as a pace band?

Yes. Choose “Print pace band” to get a narrow layout with your target, primary pace, and key markers. Your browser can print it or save it as a PDF.

LEGAL

Privacy

Your pace calculations stay in your browser. This site does not require an account and does not send your goal time, pace, split strategy, or stop buffer to an application database.

Local data

The site may save your preferred unit in local storage. Shared URLs include the plan settings you choose so another browser can recreate the same chart. A service worker may cache the site’s own files for offline use.

Infrastructure data

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Analytics and advertising

At launch, the page does not load third-party analytics, advertising pixels, external fonts, or social widgets. This notice will be updated before that changes.

Contact

For privacy questions, use the domain name in your browser and address correspondence to the site operator through the contact method published with the site in the future.

Effective July 23, 2026.

LEGAL

Terms

Half Marathon Pace Chart is a free planning utility. By using it, you agree to use the output as general informational guidance rather than a guarantee of race performance.

No coaching or medical advice

The calculator performs time, distance, and pacing mathematics. It does not assess your health, fitness, course safety, weather, fueling, injury risk, or readiness to race. Consult qualified professionals where appropriate.

Verify race-day information

Course markers, timing systems, GPS devices, route certification, conditions, and aid-station locations can differ. Confirm the organizer’s official information and make decisions based on real conditions.

Availability and accuracy

The site is provided “as is” without warranties. Reasonable care is taken with the calculations, but uninterrupted availability and error-free operation are not guaranteed.

Acceptable use

Do not attempt to disrupt the service, bypass security controls, or use automated traffic in a way that harms availability for other users.

Effective July 23, 2026.

CALCULATION NOTES

Methodology

Distance constants

Half marathon = 21.0975 km
1 mile = 1.609344 km
Half marathon ≈ 13.1093787 miles

Even pace

Average pace equals available moving time divided by race distance. With no stop buffer, moving time and finish-clock time are the same.

Continuous split profile

The pace at distance x is modeled as p(x) = a + bx. The coefficients are chosen so the integral over the full course equals the target moving time and the integral through halfway matches the selected first-half clock share.

Stop buffer

Stop seconds are distributed in proportion to distance. Half of the buffer is therefore assigned before halfway and half after halfway. This keeps the selected half split and finish clock exact while revealing the faster moving pace required.

Rounding

Calculations retain fractional seconds. Display values round to the nearest second. The final split is pinned to the exact target to prevent visible accumulation drift.

STATIC RACE PLAN

Race view

Goal 1:45:00 Pace 4:59/km

Current marker

Start

Target elapsed

0:00

Next: 5K at 24:53

Static plan only — no GPS, live timing, or position tracking.