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BOSTON MARATHON 2023

Erin Nachreiner Mackesey

WI

Bib: 14214 F

0:00
0:00
/ mi
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Overall
#0 / 26622
Top 33%
Gender (Female)
#0 / 11423
Top 13%
Division (F18-39)
#0 / 4884
Top 24%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
469 ft elev
5K· 3.11 mi
7:42/mi
23:56
↑ 97↓ 3451.5%
220 ft elev
10K· 6.21 mi
7:34/mi
47:28
↑ 79↓ 1380.4%
157 ft elev
15K· 9.32 mi
7:32/mi
1:10:52
↑ 67↓ 78
146 ft elev
20K· 12.43 mi
7:33/mi
1:34:18
↑ 106↓ 860.1%
165 ft elev
Half· 13.11 mi
7:34/mi
1:39:28
↑ 19↓ 370.5%
148 ft elev
25K· 15.53 mi
7:32/mi
1:57:45
↑ 66↓ 880.2%
127 ft elev
30K· 18.64 mi
7:46/mi
2:21:52
↑ 181↓ 1480.2%
138 ft elev
20M
7:36/mi
2:32:12
↑ 64↓ 500.2%
148 ft elev
21M
7:56/mi
2:40:08
↑ 106↓ 241.6%
227 ft elev
35K· 21.75 mi
7:16/mi
2:45:34
↑ 17↓ 861.7%
156 ft elev
23M
7:30/mi
2:54:57
↑ 23↓ 630.6%
116 ft elev
24M
7:15/mi
3:02:12
↓ 821.3%
34 ft elev
40K· 24.85 mi
7:14/mi
3:08:23
↓ 200.3%
20 ft elev
25.2M
7:44/mi
3:11:03
↑ 13↓ 160.2%
18 ft elev
Finish· 26.22 mi
7:03/mi
3:18:14
↑ 22↓ 21
17 ft elev
Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent

The Course

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Half Splits

1st Half· via Half⚖️ Balanced
Distance13.11 mi
Time1:39:28
Pace7:35 /mi
2nd Half⚖️ Balanced
Distance13.11 mi
Time1:38:46
Pace7:32 /mi
📊Even Split: Consistent pacing between halves

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:52:4823:567:4223:56
7:42
-
10K
6.21 mi11:16:2047:287:3823:32
7:34
-0:08
15K
9.32 mi11:39:441:10:527:3623:24
7:32
-0:02
20K
12.43 mi12:03:101:34:187:3523:26
7:33
+0:01
Half
13.11 mi12:08:201:39:287:355:10
7:34
+0:01
25K
15.53 mi12:26:371:57:457:3518:17
7:32
-0:02
30K
18.64 mi12:50:442:21:527:3724:07
7:46
+0:14
20M
20.00 mi13:01:042:32:127:3710:20
7:36
-0:10
21M
21.00 mi13:09:002:40:087:387:56
7:56
+0:20
35K
21.75 mi13:14:262:45:347:375:26
7:16
-0:40
23M
23.00 mi13:23:492:54:577:369:23
7:30
+0:14
24M
24.00 mi13:31:043:02:127:367:15
7:15
-0:15
40K
24.85 mi13:37:153:08:237:356:11
7:14
-0:01
25.2M
25.20 mi13:39:553:11:037:352:40
7:44
+0:30
Finish
26.22 mi13:47:063:18:147:347:11
7:03
-0:41

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

7:03 /mi

Average Pace

7:34 /mi

Slowest Pace

7:56 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:46:11

84% of race

Time at Steady Pace

32:03

16% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 7:34 /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 mi10:52:4823:567:4223:56
7:42
#11482
10K
6.21 mi11:16:2047:287:3823:32
7:34
#11250
15K
9.32 mi11:39:441:10:527:3623:24
7:32
#10952
20K
12.43 mi12:03:101:34:187:3523:26
7:33
#10600
Half
13.11 mi12:08:201:39:287:355:10
7:34
#10611
25K
15.53 mi12:26:371:57:457:3518:17
7:32
#10304
30K
18.64 mi12:50:442:21:527:3724:07
7:46
#10047
20M
20.00 mi13:01:042:32:127:3710:20
7:36
#9818
21M
21.00 mi13:09:002:40:087:387:56
7:56
#9644
35K
21.75 mi13:14:262:45:347:375:26
7:16
#9516
23M
23.00 mi13:23:492:54:577:369:23
7:30
#9264
24M
24.00 mi13:31:043:02:127:367:15
7:15
#9109
40K
24.85 mi13:37:153:08:237:356:11
7:14
#8922
25.2M
25.20 mi13:39:553:11:037:352:40
7:44
#8835
Finish
26.22 mi13:47:063:18:147:347:11
7:03
#8668
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi114822578257810438(Top 39%)2039(Top 18%)2039(Top 42%)
10K6.21 mi3.10 mi11250+2322465+1132465+11311092(Top 42%)2362(Top 21%)2362(Top 48%)
15K9.32 mi3.11 mi10952+2982308+1572308+15710438(Top 39%)2039(Top 18%)2039(Top 42%)
20K12.43 mi3.11 mi10600+3522124+1842124+1849660(Top 36%)1757(Top 15%)1757(Top 36%)
Half13.11 mi0.68 mi10611-112127-32127-310832(Top 41%)2261(Top 20%)2261(Top 46%)
25K15.53 mi2.42 mi10304+3071999+1281999+1289094(Top 34%)1587(Top 14%)1587(Top 32%)
30K18.64 mi3.11 mi10047+2571911+881911+889082(Top 34%)1732(Top 15%)1732(Top 35%)
20M20.00 mi1.36 mi9818+2291836+751836+757552(Top 28%)1240(Top 11%)1240(Top 25%)
21M21.00 mi1.00 mi9644+1741781+551781+556959(Top 26%)1119(Top 10%)1119(Top 23%)
35K21.75 mi0.75 mi9516+1281753+281753+286951(Top 26%)1092(Top 10%)1092(Top 22%)
23M23.00 mi1.25 mi9264+2521683+701683+706412(Top 24%)962(Top 8%)962(Top 20%)
24M24.00 mi1.00 mi9109+1551638+451638+456084(Top 23%)932(Top 8%)932(Top 19%)
40K24.85 mi0.85 mi8922+1871584+541584+545103(Top 19%)696(Top 6%)696(Top 14%)
25.2M25.20 mi0.35 mi8835+871562+221562+225148(Top 19%)793(Top 7%)793(Top 16%)
Finish26.22 mi1.02 mi8668+1671513+491513+495554(Top 21%)933(Top 8%)933(Top 19%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 39%
×21story building
+97ft-345ft

Overall

10438

Females

2039

F18-39

2039

5K→10K

3.1 - 6.2 mi

Top 42%
×5story building
+79ft-138ft

Overall

11092

Females

2362

F18-39

2362

10K→15K

6.2 - 9.3 mi

Top 39%
×3story building
+67ft-78ft

Overall

10438

Females

2039

F18-39

2039

15K→20K

9.3 - 12.4 mi

Top 36%
×5story building
+106ft-86ft

Overall

9660

Females

1757

F18-39

1757

20K→Half

12.4 - 13.1 mi

Top 41%
×2story building
+19ft-37ft

Overall

10832

Females

2261

F18-39

2261

Half→25K

13.1 - 15.5 mi

Top 34%
×4story building
+66ft-88ft

Overall

9094

Females

1587

F18-39

1587

25K→30K

15.5 - 18.6 mi

Top 34%
×9story building
+181ft-148ft

Overall

9082

Females

1732

F18-39

1732

30K→20M

18.6 - 20.0 mi

Top 28%
×5story building
+64ft-50ft

Overall

7552

Females

1240

F18-39

1240

20M→21M

20.0 - 21.0 mi

Top 26%
×8story building
+106ft-24ft

Overall

6959

Females

1119

F18-39

1119

21M→35K

21.0 - 21.8 mi

Top 26%
×7story building
+17ft-86ft

Overall

6951

Females

1092

F18-39

1092

35K→23M

21.8 - 23.0 mi

Top 24%
×5story building
+23ft-63ft

Overall

6412

Females

962

F18-39

962

23M→24M

23.0 - 24.0 mi

Top 23%
×6story building
+12ft-82ft

Overall

6084

Females

932

F18-39

932

24M→40K

24.0 - 24.9 mi

Top 19%
×1story
+6ft-20ft

Overall

5103

Females

696

F18-39

696

40K→25.2M

24.9 - 25.2 mi

Top 19%
×1story
+13ft-16ft

Overall

5148

Females

793

F18-39

793

25.2M→Finish

25.2 - 26.2 mi

Top 21%
×2story building
+22ft-21ft

Overall

5554

Females

933

F18-39

933

Passing Analysis

Category:
Athletes Passed
3241*
Passed By
427
Net Change
+2814
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#11482
5K → 10K419187+232#11482#11250
10K → 15K36668+298#11250#10952
15K → 20K38735+352#10952#10600
20K → Half2839-11#10600#10611
Half → 25K32417+307#10611#10304
25K → 30K301*44+257#10304#10047
30K → 20M234*5+229#10047#9818
20M → 21M18915+174#9818#9644
21M → 35K1313+128#9644#9516
35K → 23M2553+252#9516#9264
23M → 24M1583+155#9264#9109
24M → 40K1903+187#9109#8922
40K → 25.2M870+87#8922#8835
25.2M → Finish1725+167#8835#8668
TOTALS3241*427+2814

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

📊

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