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BOSTON MARATHON 2025

Tobias Karlsson

Bib: 31742•M

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Male)
#0 / 16105
Masters (Masters Men)
#0 / 10463
Division (M45-49)
#0 / 2386
Race Day Weather
50°/40°F
broken clouds

⏱️ 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
8:48/mi
27:21
↑ 97↓ 3451.5%
10K· 6.21 mi
8:01/mi
52:15
↑ 79↓ 1380.4%
15K· 9.32 mi
8:05/mi
1:17:21
↑ 67↓ 78
20K· 12.43 mi
8:25/mi
1:43:30
↑ 106↓ 860.1%
Half· 13.11 mi
8:27/mi
1:49:16
↑ 19↓ 370.5%
25K· 15.53 mi
8:44/mi
2:10:26
↑ 66↓ 880.2%
30K· 18.64 mi
9:40/mi
2:40:28
↑ 181↓ 1480.2%
20M
9:24/mi
2:53:15
↑ 64↓ 500.2%
21M
10:34/mi
3:03:49
↑ 106↓ 241.6%
35K· 21.75 mi
8:51/mi
3:10:26
↑ 17↓ 861.7%
23M
9:03/mi
3:21:46
↑ 23↓ 630.6%
24M
9:09/mi
3:30:55
↓ 821.3%
40K· 24.85 mi
9:20/mi
3:38:54
↓ 200.3%
25.2M
10:03/mi
3:42:22
↑ 13↓ 160.2%
Finish· 26.22 mi
8:43/mi
3:51:15
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:49:16
Pace8:20 /mi
2nd Half
Distance13.11 mi
Time2:01:59
Pace9:18 /mi
📊Positive Split: 11.6% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:50:1927:218:4827:21
8:48
-
10K
6.21 mi12:15:1352:158:2524:54
8:01
-0:47
15K
9.32 mi12:40:191:17:218:1825:06
8:05
+0:04
20K
12.43 mi13:06:281:43:308:2026:09
8:25
+0:20
Half
13.11 mi13:12:141:49:168:205:46
8:27
+0:02
25K
15.53 mi13:33:242:10:268:2421:10
8:44
+0:17
30K
18.64 mi14:03:262:40:288:3630:02
9:40
+0:56
20M
20.00 mi14:16:132:53:158:4012:47
9:24
-0:16
21M
21.00 mi14:26:473:03:498:4510:34
10:34
+1:10
35K
21.75 mi14:33:243:10:268:456:37
8:51
-1:43
23M
23.00 mi14:44:443:21:468:4611:20
9:03
+0:12
24M
24.00 mi14:53:533:30:558:479:09
9:09
+0:06
40K
24.85 mi15:01:523:38:548:487:59
9:20
+0:11
25.2M
25.20 mi15:05:203:42:228:493:28
10:03
+0:43
Finish
26.22 mi15:14:133:51:158:508:53
8:43
-1:20

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

8:01 /mi

Average Pace

8:50 /mi

Slowest Pace

10:34 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:21:55

35% of race

Time at Steady Pace

1:24:30

37% of race

Time at Slower Pace

1:04:50

28% of race

Average Pace: 8:49 /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 mi11:50:1927:218:4827:21
8:48
#21520
10K
6.21 mi12:15:1352:158:2524:54
8:01
#19284
15K
9.32 mi12:40:191:17:218:1825:06
8:05
#18387
20K
12.43 mi13:06:281:43:308:2026:09
8:25
#18177
Half
13.11 mi13:12:141:49:168:205:46
8:27
#18199
25K
15.53 mi13:33:242:10:268:2421:10
8:44
#18237
30K
18.64 mi14:03:262:40:288:3630:02
9:40
#18811
20M
20.00 mi14:16:132:53:158:4012:47
9:24
#18811
21M
21.00 mi14:26:473:03:498:4510:34
10:34
#18925
35K
21.75 mi14:33:243:10:268:456:37
8:51
#18860
23M
23.00 mi14:44:443:21:468:4611:20
9:03
#18712
24M
24.00 mi14:53:533:30:558:479:09
9:09
#18694
40K
24.85 mi15:01:523:38:548:487:59
9:20
#18649
25.2M
25.20 mi15:05:203:42:228:493:28
10:03
#18630
Finish
26.22 mi15:14:133:51:158:508:53
8:43
#18593
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM45-49Seg. OverallSeg. MalesSeg. M45-49
5K3.11 mi3.11 mi21520130861308616599(Top 58%)11056(Top 69%)11056(Top 463%)
10K6.21 mi3.10 mi19284+223612170+91612170+91616584(Top 58%)11066(Top 69%)11066(Top 464%)
15K9.32 mi3.11 mi18387+89711776+39411776+39416599(Top 58%)11056(Top 69%)11056(Top 463%)
20K12.43 mi3.11 mi18177+21011685+9111685+9117649(Top 62%)11464(Top 71%)11464(Top 480%)
Half13.11 mi0.68 mi18199-2211690-511690-518859(Top 66%)11984(Top 74%)11984(Top 502%)
25K15.53 mi2.42 mi18237-3811694-411694-418560(Top 65%)11771(Top 73%)11771(Top 493%)
30K18.64 mi3.11 mi18811-57411922-22811922-22820589(Top 72%)12551(Top 78%)12551(Top 526%)
20M20.00 mi1.36 mi1881111897+2511897+2518761(Top 66%)11568(Top 72%)11568(Top 485%)
21M21.00 mi1.00 mi18925-11411908-1111908-1120206(Top 71%)12128(Top 75%)12128(Top 508%)
35K21.75 mi0.75 mi18860+6511860+4811860+4817461(Top 61%)10811(Top 67%)10811(Top 453%)
23M23.00 mi1.25 mi18712+14811770+9011770+9016545(Top 58%)10313(Top 64%)10313(Top 432%)
24M24.00 mi1.00 mi18694+1811742+2811742+2818101(Top 64%)10969(Top 68%)10969(Top 460%)
40K24.85 mi0.85 mi18649+4511696+4611696+4618007(Top 63%)10833(Top 67%)10833(Top 454%)
25.2M25.20 mi0.35 mi18630+1911670+2611670+2617236(Top 61%)10477(Top 65%)10477(Top 439%)
Finish26.22 mi1.02 mi18593+3711644+2611644+2617566(Top 62%)10669(Top 66%)10669(Top 447%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 58%
×21story building
+97ft-345ft

Overall

16599

Males

11056

M45-49

11056

5K→10K

3.1 - 6.2 mi

Top 58%
×5story building
+79ft-138ft

Overall

16584

Males

11066

M45-49

11066

10K→15K

6.2 - 9.3 mi

Top 58%
×3story building
+67ft-78ft

Overall

16599

Males

11056

M45-49

11056

15K→20K

9.3 - 12.4 mi

Top 62%
×5story building
+106ft-86ft

Overall

17649

Males

11464

M45-49

11464

20K→Half

12.4 - 13.1 mi

Top 66%
×2story building
+19ft-37ft

Overall

18859

Males

11984

M45-49

11984

Half→25K

13.1 - 15.5 mi

Top 65%
×4story building
+66ft-88ft

Overall

18560

Males

11771

M45-49

11771

25K→30K

15.5 - 18.6 mi

Top 72%
×9story building
+181ft-148ft

Overall

20589

Males

12551

M45-49

12551

30K→20M

18.6 - 20.0 mi

Top 66%
×5story building
+64ft-50ft

Overall

18761

Males

11568

M45-49

11568

20M→21M

20.0 - 21.0 mi

Top 71%
×8story building
+106ft-24ft

Overall

20206

Males

12128

M45-49

12128

21M→35K

21.0 - 21.8 mi

Top 61%
×7story building
+17ft-86ft

Overall

17461

Males

10811

M45-49

10811

35K→23M

21.8 - 23.0 mi

Top 58%
×5story building
+23ft-63ft

Overall

16545

Males

10313

M45-49

10313

23M→24M

23.0 - 24.0 mi

Top 64%
×6story building
+12ft-82ft

Overall

18101

Males

10969

M45-49

10969

24M→40K

24.0 - 24.9 mi

Top 63%
×1story
+6ft-20ft

Overall

18007

Males

10833

M45-49

10833

40K→25.2M

24.9 - 25.2 mi

Top 61%
×1story
+13ft-16ft

Overall

17236

Males

10477

M45-49

10477

25.2M→Finish

25.2 - 26.2 mi

Top 62%
×2story building
+22ft-21ft

Overall

17566

Males

10669

M45-49

10669

Passing Analysis

Category:
Athletes Passed
4464
Passed By
1537
Net Change
+2927
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#21520
5K → 10K22404+2236#21520#19284
10K → 15K90811+897#19284#18387
15K → 20K28979+210#18387#18177
20K → Half3759-22#18177#18199
Half → 25K152190-38#18199#18237
25K → 30K105679-574#18237#18811
30K → 20M1011010#18811#18811
20M → 21M74188-114#18811#18925
21M → 35K8823+65#18925#18860
35K → 23M17729+148#18860#18712
23M → 24M7658+18#18712#18694
24M → 40K9247+45#18694#18649
40K → 25.2M4122+19#18649#18630
25.2M → Finish8447+37#18630#18593
TOTALS44641537+2927
📊

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