Boston Marathon logo
BOSTON MARATHON 2023

Justin White

Bib: 8550•M

CA

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 26622
Top 18%
Gender (Male)
#0 / 15176
Top 30%
Masters (Masters Men)
#0 / 9891
Top 15%
Division (M40-44)
#0 / 2241
Top 37%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
21:05
Rank: #4552
Start → 5K
21:05 | 6:47/mi
10K· 6.21 mi
42:46
Rank: #5679 (-1127)
5K → 10K
21:41 | 6:59/mi
15K· 9.32 mi
1:03:51
Rank: #5473 (+206)
10K → 15K
21:05 | 6:47/mi
20K· 12.43 mi
1:25:11
Rank: #5369 (+104)
15K → 20K
21:20 | 6:52/mi
Half· 13.11 mi
1:29:47
Rank: #5321 (+48)
20K → Half
4:36 | 6:45/mi
25K· 15.53 mi
1:46:33
Rank: #5271 (+50)
Half → 25K
16:46 | 6:55/mi
30K· 18.64 mi
2:08:25
Rank: #5076 (+195)
25K → 30K
21:52 | 7:02/mi
20M
2:17:57
Rank: #4970 (+106)
30K → 20M
9:32 | 7:01/mi
21M
2:25:16
Rank: #4851 (+119)
20M → 21M
7:19 | 7:19/mi
35K· 21.75 mi
2:30:09
Rank: #4745 (+106)
21M → 35K
4:53 | 6:32/mi
23M
2:38:47
Rank: #4618 (+127)
35K → 23M
8:38 | 6:54/mi
24M
2:45:44
Rank: #4593 (+25)
23M → 24M
6:57 | 6:57/mi
40K· 24.85 mi
2:52:09
Rank: #4646 (-53)
24M → 40K
6:25 | 7:30/mi
25.2M
2:55:06
Rank: #4686 (-40)
40K → 25.2M
2:57 | 8:33/mi
Finish· 26.22 mi
3:03:12
Rank: #4879 (-193)
25.2M → Finish
8:06 | 7:57/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
Time1:29:47
Pace6:51 /mi
2nd Half
Distance13.11 mi
Time1:33:25
Pace7:08 /mi
📊Positive Split: 4.0% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:46:1621:056:4721:05
6:47
-
10K
6.21 mi11:07:5742:466:5321:41
6:59
+0:12
15K
9.32 mi11:29:021:03:516:5121:05
6:47
-0:12
20K
12.43 mi11:50:221:25:116:5121:20
6:52
+0:05
Half
13.11 mi11:54:581:29:476:514:36
6:45
-0:07
25K
15.53 mi12:11:441:46:336:5216:46
6:55
+0:10
30K
18.64 mi12:33:362:08:256:5321:52
7:02
+0:07
20M
20.00 mi12:43:082:17:576:549:32
7:01
-0:01
21M
21.00 mi12:50:272:25:166:557:19
7:19
+0:18
35K
21.75 mi12:55:202:30:096:544:53
6:32
-0:47
23M
23.00 mi13:03:582:38:476:548:38
6:54
+0:22
24M
24.00 mi13:10:552:45:446:546:57
6:57
+0:03
40K
24.85 mi13:17:202:52:096:566:25
7:30
+0:33
25.2M
25.20 mi13:20:172:55:066:572:57
8:33
+1:03
Finish
26.22 mi13:28:233:03:127:008:06
7:57
-0:36

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

6:32 /mi

Average Pace

7:00 /mi

Slowest Pace

8:33 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

4:53

3% of race

Time at Steady Pace

2:33:32

84% of race

Time at Slower Pace

24:47

14% of race

Average Pace: 6:59 /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 mi10:46:1621:056:4721:05
6:47
#4552
10K
6.21 mi11:07:5742:466:5321:41
6:59
#5679
15K
9.32 mi11:29:021:03:516:5121:05
6:47
#5473
20K
12.43 mi11:50:221:25:116:5121:20
6:52
#5369
Half
13.11 mi11:54:581:29:476:514:36
6:45
#5321
25K
15.53 mi12:11:441:46:336:5216:46
6:55
#5271
30K
18.64 mi12:33:362:08:256:5321:52
7:02
#5076
20M
20.00 mi12:43:082:17:576:549:32
7:01
#4970
21M
21.00 mi12:50:272:25:166:557:19
7:19
#4851
35K
21.75 mi12:55:202:30:096:544:53
6:32
#4745
23M
23.00 mi13:03:582:38:476:548:38
6:54
#4618
24M
24.00 mi13:10:552:45:446:546:57
6:57
#4593
40K
24.85 mi13:17:202:52:096:566:25
7:30
#4646
25.2M
25.20 mi13:20:172:55:066:572:57
8:33
#4686
Finish
26.22 mi13:28:233:03:127:008:06
7:57
#4879
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM40-44Seg. OverallSeg. MalesSeg. M40-44
5K3.11 mi3.11 mi4552424642464976(Top 19%)4620(Top 30%)4620(Top 206%)
10K6.21 mi3.10 mi5679-11275222-9765222-9766666(Top 25%)5983(Top 39%)5983(Top 267%)
15K9.32 mi3.11 mi5473+2065054+1685054+1684976(Top 19%)4620(Top 30%)4620(Top 206%)
20K12.43 mi3.11 mi5369+1044968+864968+865065(Top 19%)4688(Top 31%)4688(Top 209%)
Half13.11 mi0.68 mi5321+484927+414927+414764(Top 18%)4426(Top 29%)4426(Top 198%)
25K15.53 mi2.42 mi5271+504882+454882+455053(Top 19%)4670(Top 31%)4670(Top 208%)
30K18.64 mi3.11 mi5076+1954707+1754707+1754596(Top 17%)4255(Top 28%)4255(Top 190%)
20M20.00 mi1.36 mi4970+1064611+964611+964133(Top 16%)3823(Top 25%)3823(Top 171%)
21M21.00 mi1.00 mi4851+1194507+1044507+1043717(Top 14%)3448(Top 23%)3448(Top 154%)
35K21.75 mi0.75 mi4745+1064414+934414+932618(Top 10%)2477(Top 16%)2477(Top 111%)
23M23.00 mi1.25 mi4618+1274297+1174297+1173219(Top 12%)2996(Top 20%)2996(Top 134%)
24M24.00 mi1.00 mi4593+254276+214276+214423(Top 17%)3998(Top 26%)3998(Top 178%)
40K24.85 mi0.85 mi4646-534317-414317-416710(Top 25%)5447(Top 36%)5447(Top 243%)
25.2M25.20 mi0.35 mi4686-404345-284345-289740(Top 37%)7126(Top 47%)7126(Top 318%)
Finish26.22 mi1.02 mi4879-1934495-1504495-15011687(Top 44%)8120(Top 54%)8120(Top 362%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 19%
×21stories
+97ft-345ft

Overall

4976

Males

4620

M40-44

4620

5K→10K

3.1 - 6.2 mi

Top 25%
×5stories
+79ft-138ft

Overall

6666

Males

5983

M40-44

5983

10K→15K

6.2 - 9.3 mi

Top 19%
×3stories
+67ft-78ft

Overall

4976

Males

4620

M40-44

4620

15K→20K

9.3 - 12.4 mi

Top 19%
×5stories
+106ft-86ft

Overall

5065

Males

4688

M40-44

4688

20K→Half

12.4 - 13.1 mi

Top 18%
×2stories
+19ft-37ft

Overall

4764

Males

4426

M40-44

4426

Half→25K

13.1 - 15.5 mi

Top 19%
×4stories
+66ft-88ft

Overall

5053

Males

4670

M40-44

4670

25K→30K

15.5 - 18.6 mi

Top 17%
×9stories
+181ft-148ft

Overall

4596

Males

4255

M40-44

4255

30K→20M

18.6 - 20.0 mi

Top 16%
×5stories
+64ft-50ft

Overall

4133

Males

3823

M40-44

3823

20M→21M

20.0 - 21.0 mi

Top 14%
×8stories
+106ft-24ft

Overall

3717

Males

3448

M40-44

3448

21M→35K

21.0 - 21.8 mi

Top 10%
×7stories
+17ft-86ft

Overall

2618

Males

2477

M40-44

2477

35K→23M

21.8 - 23.0 mi

Top 12%
×5stories
+23ft-63ft

Overall

3219

Males

2996

M40-44

2996

23M→24M

23.0 - 24.0 mi

Top 17%
×6stories
+12ft-82ft

Overall

4423

Males

3998

M40-44

3998

24M→40K

24.0 - 24.9 mi

Top 25%
×1story
+6ft-20ft

Overall

6710

Males

5447

M40-44

5447

40K→25.2M

24.9 - 25.2 mi

Top 37%
×1story
+13ft-16ft

Overall

9740

Males

7126

M40-44

7126

25.2M→Finish

25.2 - 26.2 mi

Top 44%
×2stories
+22ft-21ft

Overall

11687

Males

8120

M40-44

8120

Passing Analysis

Category:
Athletes Passed
1432
Passed By
1759
Net Change
-327
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#4552
5K → 10K181145-1127#4552#5679
10K → 15K24842+206#5679#5473
15K → 20K14844+104#5473#5369
20K → Half546+48#5369#5321
Half → 25K11161+50#5321#5271
25K → 30K23843+195#5271#5076
30K → 20M12721+106#5076#4970
20M → 21M13213+119#4970#4851
21M → 35K1115+106#4851#4745
35K → 23M14215+127#4745#4618
23M → 24M5530+25#4618#4593
24M → 40K2982-53#4593#4646
40K → 25.2M949-40#4646#4686
25.2M → Finish10203-193#4686#4879
TOTALS14321759-327
📊

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