Boston Marathon logo
BOSTON MARATHON 2023

Brian Carlsen

Bib: 9983•M

MN

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 26622
Top 40%
Gender (Male)
#0 / 15176
Masters (Masters Men)
#0 / 9891
Top 45%
Division (M50-54)
#0 / 2052
Top 46%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
21:18
Rank: #5199
Start → 5K
21:18 | 6:51/mi
10K· 6.21 mi
42:53
Rank: #5837 (-638)
5K → 10K
21:35 | 6:57/mi
15K· 9.32 mi
1:04:51
Rank: #6247 (-410)
10K → 15K
21:58 | 7:04/mi
20K· 12.43 mi
1:27:18
Rank: #6491 (-244)
15K → 20K
22:27 | 7:14/mi
Half· 13.11 mi
1:32:14
Rank: #6565 (-74)
20K → Half
4:56 | 7:14/mi
25K· 15.53 mi
1:49:39
Rank: #6548 (+17)
Half → 25K
17:25 | 7:11/mi
30K· 18.64 mi
2:13:42
Rank: #6828 (-280)
25K → 30K
24:03 | 7:44/mi
20M
2:25:48
Rank: #7378 (-550)
30K → 20M
12:06 | 8:54/mi
21M
2:35:26
Rank: #7873 (-495)
20M → 21M
9:38 | 9:38/mi
35K· 21.75 mi
2:41:56
Rank: #8214 (-341)
21M → 35K
6:30 | 8:41/mi
23M
2:53:44
Rank: #8881 (-667)
35K → 23M
11:48 | 9:25/mi
24M
3:03:14
Rank: #9438 (-557)
23M → 24M
9:30 | 9:30/mi
40K· 24.85 mi
3:11:58
Rank: #10025 (-587)
24M → 40K
8:44 | 10:13/mi
25.2M
3:15:35
Rank: #10214 (-189)
40K → 25.2M
3:37 | 10:29/mi
Finish· 26.22 mi
3:25:19
Rank: #10766 (-552)
25.2M → Finish
9:44 | 9:33/mi

The Course

Is this your race?

Claim it — unlock a deeper AI report on this race, free

A personalized Race Performance Report that goes beyond this page — emailed to you, built from your real splits.

Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:32:14
Pace7:02 /mi
2nd Half
Distance13.11 mi
Time1:53:05
Pace8:38 /mi
📊Positive Split: 22.6% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:46:3721:186:5121:18
6:51
-
10K
6.21 mi11:08:1242:536:5421:35
6:57
+0:06
15K
9.32 mi11:30:101:04:516:5721:58
7:04
+0:07
20K
12.43 mi11:52:371:27:187:0122:27
7:14
+0:10
Half
13.11 mi11:57:331:32:147:024:56
7:14
0:00
25K
15.53 mi12:14:581:49:397:0417:25
7:11
-0:03
30K
18.64 mi12:39:012:13:427:1024:03
7:44
+0:33
20M
20.00 mi12:51:072:25:487:1712:06
8:54
+1:10
21M
21.00 mi13:00:452:35:267:249:38
9:38
+0:44
35K
21.75 mi13:07:152:41:567:276:30
8:41
-0:57
23M
23.00 mi13:19:032:53:447:3311:48
9:25
+0:44
24M
24.00 mi13:28:333:03:147:389:30
9:30
+0:05
40K
24.85 mi13:37:173:11:587:438:44
10:13
+0:43
25.2M
25.20 mi13:40:543:15:357:463:37
10:29
+0:16
Finish
26.22 mi13:50:383:25:197:509:44
9:33
-0:56

Checkpoints & Pacing

📈Pace Line

Pace Progression

Track your pace changes throughout the race. Dot colors mark your quickest to easiest segments, relative to your own pace.

Fastest Pace

6:51 /mi

Average Pace

7:50 /mi

Slowest Pace

10:29 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:13:42

65% of race

Time at Steady Pace

18:36

9% of race

Time at Slower Pace

53:01

26% of race

Average Pace: 7:50 /mi

Loading chart...
Faster pace (< avg)
Steady pace (≈ avg)
Slower pace (> avg)

🎨Heatmap

Pace Heatmap

Where you sped up and eased off relative to your own pace across the race. Colors are relative to your own range, not to other runners.

Loading...
0mi6.6mi13.1mi19.7mi26.2mi
Pace:
Faster
Steady
Slower

Click or hover over segments to see details

✨Sparklines

Checkpoint Splits with Pace Trends

Overall Pace Trend

CheckpointDistanceTime of DayTimeAvg PaceSegmentPaceTrendRank
5K
3.11 mi10:46:3721:186:5121:18
6:51
#5199
10K
6.21 mi11:08:1242:536:5421:35
6:57
#5837
15K
9.32 mi11:30:101:04:516:5721:58
7:04
#6247
20K
12.43 mi11:52:371:27:187:0122:27
7:14
#6491
Half
13.11 mi11:57:331:32:147:024:56
7:14
#6565
25K
15.53 mi12:14:581:49:397:0417:25
7:11
#6548
30K
18.64 mi12:39:012:13:427:1024:03
7:44
#6828
20M
20.00 mi12:51:072:25:487:1712:06
8:54
#7378
21M
21.00 mi13:00:452:35:267:249:38
9:38
#7873
35K
21.75 mi13:07:152:41:567:276:30
8:41
#8214
23M
23.00 mi13:19:032:53:447:3311:48
9:25
#8881
24M
24.00 mi13:28:333:03:147:389:30
9:30
#9438
40K
24.85 mi13:37:173:11:587:438:44
10:13
#10025
25.2M
25.20 mi13:40:543:15:357:463:37
10:29
#10214
Finish
26.22 mi13:50:383:25:197:509:44
9:33
#10766
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM50-54Seg. OverallSeg. MalesSeg. M50-54
5K3.11 mi3.11 mi5199482248226975(Top 26%)6231(Top 41%)6231(Top 304%)
10K6.21 mi3.10 mi5837-6385354-5325354-5326465(Top 24%)5827(Top 38%)5827(Top 284%)
15K9.32 mi3.11 mi6247-4105671-3175671-3176975(Top 26%)6231(Top 41%)6231(Top 304%)
20K12.43 mi3.11 mi6491-2445856-1855856-1857268(Top 27%)6401(Top 42%)6401(Top 312%)
Half13.11 mi0.68 mi6565-745910-545910-548102(Top 30%)6974(Top 46%)6974(Top 340%)
25K15.53 mi2.42 mi6548+175890+205890+206594(Top 25%)5864(Top 39%)5864(Top 286%)
30K18.64 mi3.11 mi6828-2806087-1976087-1978940(Top 34%)7250(Top 48%)7250(Top 353%)
20M20.00 mi1.36 mi7378-5506462-3756462-37516004(Top 60%)10402(Top 69%)10402(Top 507%)
21M21.00 mi1.00 mi7873-4956768-3066768-30616550(Top 62%)10581(Top 70%)10581(Top 516%)
35K21.75 mi0.75 mi8214-3416959-1916959-19116314(Top 61%)10400(Top 69%)10400(Top 507%)
23M23.00 mi1.25 mi8881-6677349-3907349-39018004(Top 68%)11110(Top 73%)11110(Top 541%)
24M24.00 mi1.00 mi9438-5577653-3047653-30419183(Top 72%)11604(Top 76%)11604(Top 565%)
40K24.85 mi0.85 mi10025-5877941-2887941-28820499(Top 77%)12138(Top 80%)12138(Top 592%)
25.2M25.20 mi0.35 mi10214-1898035-948035-9418988(Top 71%)11444(Top 75%)11444(Top 558%)
Finish26.22 mi1.02 mi10766-5528271-2368271-23620283(Top 76%)12087(Top 80%)12087(Top 589%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 26%
×21stories
+97ft-345ft

Overall

6975

Males

6231

M50-54

6231

5K→10K

3.1 - 6.2 mi

Top 24%
×5stories
+79ft-138ft

Overall

6465

Males

5827

M50-54

5827

10K→15K

6.2 - 9.3 mi

Top 26%
×3stories
+67ft-78ft

Overall

6975

Males

6231

M50-54

6231

15K→20K

9.3 - 12.4 mi

Top 27%
×5stories
+106ft-86ft

Overall

7268

Males

6401

M50-54

6401

20K→Half

12.4 - 13.1 mi

Top 30%
×2stories
+19ft-37ft

Overall

8102

Males

6974

M50-54

6974

Half→25K

13.1 - 15.5 mi

Top 25%
×4stories
+66ft-88ft

Overall

6594

Males

5864

M50-54

5864

25K→30K

15.5 - 18.6 mi

Top 34%
×9stories
+181ft-148ft

Overall

8940

Males

7250

M50-54

7250

30K→20M

18.6 - 20.0 mi

Top 60%
×5stories
+64ft-50ft

Overall

16004

Males

10402

M50-54

10402

20M→21M

20.0 - 21.0 mi

Top 62%
×8stories
+106ft-24ft

Overall

16550

Males

10581

M50-54

10581

21M→35K

21.0 - 21.8 mi

Top 61%
×7stories
+17ft-86ft

Overall

16314

Males

10400

M50-54

10400

35K→23M

21.8 - 23.0 mi

Top 68%
×5stories
+23ft-63ft

Overall

18004

Males

11110

M50-54

11110

23M→24M

23.0 - 24.0 mi

Top 72%
×6stories
+12ft-82ft

Overall

19183

Males

11604

M50-54

11604

24M→40K

24.0 - 24.9 mi

Top 77%
×1story
+6ft-20ft

Overall

20499

Males

12138

M50-54

12138

40K→25.2M

24.9 - 25.2 mi

Top 71%
×1story
+13ft-16ft

Overall

18988

Males

11444

M50-54

11444

25.2M→Finish

25.2 - 26.2 mi

Top 76%
×2stories
+22ft-21ft

Overall

20283

Males

12087

M50-54

12087

Passing Analysis

Category:
Athletes Passed
283*
Passed By
5848
Net Change
-5567
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#5199
5K → 10K41679-638#5199#5837
10K → 15K24434-410#5837#6247
15K → 20K37281-244#6247#6491
20K → Half276-74#6491#6565
Half → 25K8164+17#6565#6548
25K → 30K47327-280#6548#6828
30K → 20M4554-550#6828#7378
20M → 21M5500-495#7378#7873
21M → 35K6347-341#7873#8214
35K → 23M6673-667#8214#8881
23M → 24M9566-557#8881#9438
24M → 40K5590-587#9438#10025
40K → 25.2M4*193-189#10025#10214
25.2M → Finish12564-552#10214#10766
TOTALS283*5848-5567

* Includes athletes who did not complete a segment (DNF/DNQ).

📊

Passing Visuals

Category:
Loading...

🔥Passing Intensity

Loading...

🔄Passing Circle

Loading...

🌊Position Flow

Loading...

🏃Race Lanes

Loading...

Upload your GPX file

Supports Garmin, Apple Watch, Polar, Suunto, COROS, Strava, and other apps

.gpx files up to 10MB

Export Track Data

Download your race performance as a GPX or TCX file to import into Strava, Garmin Connect, or other fitness apps.

Questions or issues regarding timing data?

If you notice any discrepancies in your timing data or have questions about your results, our support team can help.

Contact Race Support
Share Feedback

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing