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BOSTON MARATHON 2023

Tzu Wen Chang

Bib: 11847•M

0:00
0:00
/ mi
Masters
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Overall
#0 / 26622
Top 35%
Gender (Male)
#0 / 15176
Top 49%
Masters (Masters Men)
#0 / 9891
Top 38%
Division (M50-54)
#0 / 2052
Top 36%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent
Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
5K· 3.11 mi
7:30/mi
23:17
↑ 97↓ 3451.5%
10K· 6.21 mi
7:11/mi
45:36
↑ 79↓ 1380.4%
15K· 9.32 mi
7:14/mi
1:08:04
↑ 67↓ 78
20K· 12.43 mi
7:24/mi
1:31:04
↑ 106↓ 860.1%
Half· 13.11 mi
7:23/mi
1:36:06
↑ 19↓ 370.5%
25K· 15.53 mi
7:32/mi
1:54:23
↑ 66↓ 880.2%
30K· 18.64 mi
7:51/mi
2:18:45
↑ 181↓ 1480.2%
20M
7:33/mi
2:29:01
↑ 64↓ 500.2%
21M
8:53/mi
2:37:54
↑ 106↓ 241.6%
35K· 21.75 mi
7:53/mi
2:43:48
↑ 17↓ 861.7%
23M
7:46/mi
2:53:32
↑ 23↓ 630.6%
24M
8:02/mi
3:01:34
↓ 821.3%
40K· 24.85 mi
8:26/mi
3:08:47
↓ 200.3%
25.2M
9:08/mi
3:11:56
↑ 13↓ 160.2%
Finish· 26.22 mi
8:11/mi
3:20:16
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:36:06
Pace7:20 /mi
2nd Half
Distance13.11 mi
Time1:44:10
Pace7:57 /mi
📊Positive Split: 8.4% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:49:5923:177:3023:17
7:30
-
10K
6.21 mi11:12:1845:367:2022:19
7:11
-0:19
15K
9.32 mi11:34:461:08:047:1822:28
7:14
+0:03
20K
12.43 mi11:57:461:31:047:2023:00
7:24
+0:10
Half
13.11 mi12:02:481:36:067:205:02
7:23
-0:01
25K
15.53 mi12:21:051:54:237:2218:17
7:32
+0:09
30K
18.64 mi12:45:272:18:457:2724:22
7:51
+0:19
20M
20.00 mi12:55:432:29:017:2710:16
7:33
-0:18
21M
21.00 mi13:04:362:37:547:318:53
8:53
+1:20
35K
21.75 mi13:10:302:43:487:325:54
7:53
-1:00
23M
23.00 mi13:20:142:53:327:339:44
7:46
-0:07
24M
24.00 mi13:28:163:01:347:348:02
8:02
+0:16
40K
24.85 mi13:35:293:08:477:367:13
8:26
+0:24
25.2M
25.20 mi13:38:383:11:567:373:09
9:08
+0:42
Finish
26.22 mi13:46:583:20:167:398:20
8:11
-0:57

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

7:11 /mi

Average Pace

7:39 /mi

Slowest Pace

9:08 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:12:49

36% of race

Time at Steady Pace

1:39:52

50% of race

Time at Slower Pace

27:35

14% of race

Average Pace: 7:38 /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 mi10:49:5923:177:3023:17
7:30
#9564
10K
6.21 mi11:12:1845:367:2022:19
7:11
#8714
15K
9.32 mi11:34:461:08:047:1822:28
7:14
#8483
20K
12.43 mi11:57:461:31:047:2023:00
7:24
#8448
Half
13.11 mi12:02:481:36:067:205:02
7:23
#8489
25K
15.53 mi12:21:051:54:237:2218:17
7:32
#8538
30K
18.64 mi12:45:272:18:457:2724:22
7:51
#8699
20M
20.00 mi12:55:432:29:017:2710:16
7:33
#8556
21M
21.00 mi13:04:362:37:547:318:53
8:53
#8802
35K
21.75 mi13:10:302:43:487:325:54
7:53
#8874
23M
23.00 mi13:20:142:53:327:339:44
7:46
#8817
24M
24.00 mi13:28:163:01:347:348:02
8:02
#8901
40K
24.85 mi13:35:293:08:477:367:13
8:26
#9046
25.2M
25.20 mi13:38:383:11:567:373:09
9:08
#9099
Finish
26.22 mi13:46:583:20:167:398:20
8:11
#9264
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM50-54Seg. OverallSeg. MalesSeg. M50-54
5K3.11 mi3.11 mi9564790679068014(Top 30%)6932(Top 46%)6932(Top 338%)
10K6.21 mi3.10 mi8714+8507410+4967410+4967978(Top 30%)6925(Top 46%)6925(Top 337%)
15K9.32 mi3.11 mi8483+2317258+1527258+1528014(Top 30%)6932(Top 46%)6932(Top 338%)
20K12.43 mi3.11 mi8448+357222+367222+368534(Top 32%)7218(Top 48%)7218(Top 352%)
Half13.11 mi0.68 mi8489-417248-267248-269197(Top 35%)7632(Top 50%)7632(Top 372%)
25K15.53 mi2.42 mi8538-497252-47252-49074(Top 34%)7483(Top 49%)7483(Top 365%)
30K18.64 mi3.11 mi8699-1617319-677319-679671(Top 36%)7651(Top 50%)7651(Top 373%)
20M20.00 mi1.36 mi8556+1437209+1107209+1107184(Top 27%)6101(Top 40%)6101(Top 297%)
21M21.00 mi1.00 mi8802-2467349-1407349-14012719(Top 48%)8894(Top 59%)8894(Top 433%)
35K21.75 mi0.75 mi8874-727375-267375-2611237(Top 42%)8219(Top 54%)8219(Top 401%)
23M23.00 mi1.25 mi8817+577309+667309+668218(Top 31%)6536(Top 43%)6536(Top 319%)
24M24.00 mi1.00 mi8901-847331-227331-2211434(Top 43%)8110(Top 53%)8110(Top 395%)
40K24.85 mi0.85 mi9046-1457407-767407-7612933(Top 49%)8739(Top 58%)8739(Top 426%)
25.2M25.20 mi0.35 mi9099-537425-187425-1813182(Top 50%)8823(Top 58%)8823(Top 430%)
Finish26.22 mi1.02 mi9264-1657490-657490-6513241(Top 50%)8886(Top 59%)8886(Top 433%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 30%
×21story building
+97ft-345ft

Overall

8014

Males

6932

M50-54

6932

5K→10K

3.1 - 6.2 mi

Top 30%
×5story building
+79ft-138ft

Overall

7978

Males

6925

M50-54

6925

10K→15K

6.2 - 9.3 mi

Top 30%
×3story building
+67ft-78ft

Overall

8014

Males

6932

M50-54

6932

15K→20K

9.3 - 12.4 mi

Top 32%
×5story building
+106ft-86ft

Overall

8534

Males

7218

M50-54

7218

20K→Half

12.4 - 13.1 mi

Top 35%
×2story building
+19ft-37ft

Overall

9197

Males

7632

M50-54

7632

Half→25K

13.1 - 15.5 mi

Top 34%
×4story building
+66ft-88ft

Overall

9074

Males

7483

M50-54

7483

25K→30K

15.5 - 18.6 mi

Top 36%
×9story building
+181ft-148ft

Overall

9671

Males

7651

M50-54

7651

30K→20M

18.6 - 20.0 mi

Top 27%
×5story building
+64ft-50ft

Overall

7184

Males

6101

M50-54

6101

20M→21M

20.0 - 21.0 mi

Top 48%
×8story building
+106ft-24ft

Overall

12719

Males

8894

M50-54

8894

21M→35K

21.0 - 21.8 mi

Top 42%
×7story building
+17ft-86ft

Overall

11237

Males

8219

M50-54

8219

35K→23M

21.8 - 23.0 mi

Top 31%
×5story building
+23ft-63ft

Overall

8218

Males

6536

M50-54

6536

23M→24M

23.0 - 24.0 mi

Top 43%
×6story building
+12ft-82ft

Overall

11434

Males

8110

M50-54

8110

24M→40K

24.0 - 24.9 mi

Top 49%
×1story
+6ft-20ft

Overall

12933

Males

8739

M50-54

8739

40K→25.2M

24.9 - 25.2 mi

Top 50%
×1story
+13ft-16ft

Overall

13182

Males

8823

M50-54

8823

25.2M→Finish

25.2 - 26.2 mi

Top 50%
×2story building
+22ft-21ft

Overall

13241

Males

8886

M50-54

8886

Passing Analysis

Category:
Athletes Passed
1930
Passed By
1630
Net Change
+300
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#9564
5K → 10K89141+850#9564#8714
10K → 15K27544+231#8714#8483
15K → 20K150115+35#8483#8448
20K → Half748-41#8448#8489
Half → 25K78127-49#8489#8538
25K → 30K123284-161#8538#8699
30K → 20M15310+143#8699#8556
20M → 21M27273-246#8556#8802
21M → 35K2799-72#8802#8874
35K → 23M10447+57#8874#8817
23M → 24M44128-84#8817#8901
24M → 40K20165-145#8901#9046
40K → 25.2M1164-53#9046#9099
25.2M → Finish20185-165#9099#9264
TOTALS19301630+300
📊

Passing Visuals

Category:
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🔄Passing Circle

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🌊Position Flow

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🏃Race Lanes

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Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing