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BOSTON MARATHON 2025

Fabio Kaczynski

Bib: 8730•M

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Male)
#0 / 16105
Masters (Masters Men)
#0 / 10463
Division (M40-44)
#0 / 2247
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
21:15
Rank: #6644
Start → 5K
21:15 | 6:50/mi
10K· 6.21 mi
43:12
Rank: #7539 (-895)
5K → 10K
21:57 | 7:04/mi
15K· 9.32 mi
1:06:11
Rank: #8484 (-945)
10K → 15K
22:59 | 7:24/mi
20K· 12.43 mi
1:30:18
Rank: #9553 (-1069)
15K → 20K
24:07 | 7:46/mi
Half· 13.11 mi
1:35:34
Rank: #9777 (-224)
20K → Half
5:16 | 7:43/mi
25K· 15.53 mi
1:54:58
Rank: #10458 (-681)
Half → 25K
19:24 | 8:00/mi
30K· 18.64 mi
2:22:40
Rank: #11841 (-1383)
25K → 30K
27:42 | 8:55/mi
20M
2:35:22
Rank: #12463 (-622)
30K → 20M
12:42 | 9:21/mi
21M
2:46:18
Rank: #13238 (-775)
20M → 21M
10:56 | 10:56/mi
35K· 21.75 mi
2:53:12
Rank: #13505 (-267)
21M → 35K
6:54 | 9:13/mi
23M
3:05:50
Rank: #14177 (-672)
35K → 23M
12:38 | 10:05/mi
24M
3:15:50
Rank: #14613 (-436)
23M → 24M
10:00 | 10:00/mi
40K· 24.85 mi
3:24:31
Rank: #14942 (-329)
24M → 40K
8:41 | 10:09/mi
25.2M
3:28:23
Rank: #15098 (-156)
40K → 25.2M
3:52 | 11:13/mi
Finish· 26.22 mi
3:37:19
Rank: #15216 (-118)
25.2M → Finish
8:56 | 8:46/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:35:34
Pace7:17 /mi
2nd Half
Distance13.11 mi
Time2:01:45
Pace9:17 /mi
📊Positive Split: 27.4% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:46:2321:156:5021:15
6:50
-
10K
6.21 mi11:08:2043:126:5721:57
7:04
+0:14
15K
9.32 mi11:31:191:06:117:0622:59
7:24
+0:20
20K
12.43 mi11:55:261:30:187:1624:07
7:46
+0:22
Half
13.11 mi12:00:421:35:347:175:16
7:43
-0:03
25K
15.53 mi12:20:061:54:587:2419:24
8:00
+0:17
30K
18.64 mi12:47:482:22:407:3927:42
8:55
+0:55
20M
20.00 mi13:00:302:35:227:4612:42
9:21
+0:26
21M
21.00 mi13:11:262:46:187:5510:56
10:56
+1:35
35K
21.75 mi13:18:202:53:127:586:54
9:13
-1:43
23M
23.00 mi13:30:583:05:508:0512:38
10:05
+0:52
24M
24.00 mi13:40:583:15:508:1010:00
10:00
-0:05
40K
24.85 mi13:49:393:24:318:148:41
10:09
+0:09
25.2M
25.20 mi13:53:313:28:238:163:52
11:13
+1:04
Finish
26.22 mi14:02:273:37:198:188:56
8:46
-2:27

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

6:50 /mi

Average Pace

8:18 /mi

Slowest Pace

11:13 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:54:58

53% of race

Time at Steady Pace

56:14

26% of race

Time at Slower Pace

46:07

21% of race

Average Pace: 8:17 /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 mi10:46:2321:156:5021:15
6:50
#6644
10K
6.21 mi11:08:2043:126:5721:57
7:04
#7539
15K
9.32 mi11:31:191:06:117:0622:59
7:24
#8484
20K
12.43 mi11:55:261:30:187:1624:07
7:46
#9553
Half
13.11 mi12:00:421:35:347:175:16
7:43
#9777
25K
15.53 mi12:20:061:54:587:2419:24
8:00
#10458
30K
18.64 mi12:47:482:22:407:3927:42
8:55
#11841
20M
20.00 mi13:00:302:35:227:4612:42
9:21
#12463
21M
21.00 mi13:11:262:46:187:5510:56
10:56
#13238
35K
21.75 mi13:18:202:53:127:586:54
9:13
#13505
23M
23.00 mi13:30:583:05:508:0512:38
10:05
#14177
24M
24.00 mi13:40:583:15:508:1010:00
10:00
#14613
40K
24.85 mi13:49:393:24:318:148:41
10:09
#14942
25.2M
25.20 mi13:53:313:28:238:163:52
11:13
#15098
Finish
26.22 mi14:02:273:37:198:188:56
8:46
#15216
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM40-44Seg. OverallSeg. MalesSeg. M40-44
5K3.11 mi3.11 mi66446033603310854(Top 38%)8530(Top 53%)8530(Top 380%)
10K6.21 mi3.10 mi7539-8956683-6506683-6508392(Top 30%)7233(Top 45%)7233(Top 322%)
15K9.32 mi3.11 mi8484-9457277-5947277-59410854(Top 38%)8530(Top 53%)8530(Top 380%)
20K12.43 mi3.11 mi9553-10697862-5857862-58512959(Top 46%)9404(Top 58%)9404(Top 419%)
Half13.11 mi0.68 mi9777-2247985-1237985-12313528(Top 48%)9716(Top 60%)9716(Top 432%)
25K15.53 mi2.42 mi10458-6818318-3338318-33313901(Top 49%)9709(Top 60%)9709(Top 432%)
30K18.64 mi3.11 mi11841-13838894-5768894-57617229(Top 61%)11031(Top 68%)11031(Top 491%)
20M20.00 mi1.36 mi12463-6229145-2519145-25118483(Top 65%)11437(Top 71%)11437(Top 509%)
21M21.00 mi1.00 mi13238-7759461-3169461-31621199(Top 75%)12586(Top 78%)12586(Top 560%)
35K21.75 mi0.75 mi13505-2679553-929553-9219227(Top 68%)11603(Top 72%)11603(Top 516%)
23M23.00 mi1.25 mi14177-6729810-2579810-25720763(Top 73%)12272(Top 76%)12272(Top 546%)
24M24.00 mi1.00 mi14613-4369990-1809990-18021356(Top 75%)12514(Top 78%)12514(Top 557%)
40K24.85 mi0.85 mi14942-32910104-11410104-11420936(Top 74%)12246(Top 76%)12246(Top 545%)
25.2M25.20 mi0.35 mi15098-15610145-4110145-4121212(Top 75%)12374(Top 77%)12374(Top 551%)
Finish26.22 mi1.02 mi15216-11810173-2810173-2817846(Top 63%)10794(Top 67%)10794(Top 480%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 38%
×21stories
+97ft-345ft

Overall

10854

Males

8530

M40-44

8530

5K→10K

3.1 - 6.2 mi

Top 30%
×5stories
+79ft-138ft

Overall

8392

Males

7233

M40-44

7233

10K→15K

6.2 - 9.3 mi

Top 38%
×3stories
+67ft-78ft

Overall

10854

Males

8530

M40-44

8530

15K→20K

9.3 - 12.4 mi

Top 46%
×5stories
+106ft-86ft

Overall

12959

Males

9404

M40-44

9404

20K→Half

12.4 - 13.1 mi

Top 48%
×2stories
+19ft-37ft

Overall

13528

Males

9716

M40-44

9716

Half→25K

13.1 - 15.5 mi

Top 49%
×4stories
+66ft-88ft

Overall

13901

Males

9709

M40-44

9709

25K→30K

15.5 - 18.6 mi

Top 61%
×9stories
+181ft-148ft

Overall

17229

Males

11031

M40-44

11031

30K→20M

18.6 - 20.0 mi

Top 65%
×5stories
+64ft-50ft

Overall

18483

Males

11437

M40-44

11437

20M→21M

20.0 - 21.0 mi

Top 75%
×8stories
+106ft-24ft

Overall

21199

Males

12586

M40-44

12586

21M→35K

21.0 - 21.8 mi

Top 68%
×7stories
+17ft-86ft

Overall

19227

Males

11603

M40-44

11603

35K→23M

21.8 - 23.0 mi

Top 73%
×5stories
+23ft-63ft

Overall

20763

Males

12272

M40-44

12272

23M→24M

23.0 - 24.0 mi

Top 75%
×6stories
+12ft-82ft

Overall

21356

Males

12514

M40-44

12514

24M→40K

24.0 - 24.9 mi

Top 74%
×1story
+6ft-20ft

Overall

20936

Males

12246

M40-44

12246

40K→25.2M

24.9 - 25.2 mi

Top 75%
×1story
+13ft-16ft

Overall

21212

Males

12374

M40-44

12374

25.2M→Finish

25.2 - 26.2 mi

Top 63%
×2stories
+22ft-21ft

Overall

17846

Males

10794

M40-44

10794

Passing Analysis

Category:
Athletes Passed
327
Passed By
8896
Net Change
-8572
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#6644
5K → 10K26921-895#6644#7539
10K → 15K22967-945#7539#8484
15K → 20K341103-1069#8484#9553
20K → Half0224-224#9553#9777
Half → 25K50729-681#9777#10458
25K → 30K361418-1383#10458#11841
30K → 20M30652-622#11841#12463
20M → 21M10785-775#12463#13238
21M → 35K18285-267#13238#13505
35K → 23M25697-672#13505#14177
23M → 24M12448-436#14177#14613
24M → 40K17346-329#14613#14942
40K → 25.2M12168-156#14942#15098
25.2M → Finish35153-118#15098#15216
TOTALS3278896-8572
📊

Passing Visuals

Category:
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🔥Passing Intensity

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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