223:, all runs scored by or against a team at home (per game) are divided by all runs scored on the road (per game). Parks with a Park Factor over 100 are those where more overall runs are scored when the team is at home than are scored when the team is away. While some variation can be attributable to fluctuations in offensive and defensive performance, PF accounts for the production of both teams in each park and, correspondingly, is very useful in trying to determine which ballparks are "hitter friendly" and which are "pitcher friendly". One criticism is that Park Factor does not account for differences in
215:
337:
54:
227:
between teams. An above-average pitching staff may distort their home stadium's Park Factor by making it seem more pitcher-friendly than it really is.
587:
592:
748:
582:
330:
703:
530:
520:
803:
733:
844:
323:
362:
235:
252:
247:
617:
572:
464:
42:
community, it has found more general usage in recent years. It is helpful in assessing how much a specific
758:
813:
793:
670:
497:
818:
454:
414:
281:
798:
718:
607:
788:
665:
640:
512:
372:
346:
310:
31:
632:
622:
557:
367:
354:
294:
778:
728:
645:
392:
387:
382:
713:
655:
429:
224:
540:
535:
525:
502:
469:
439:
693:
210:{\displaystyle PF=100*({{homeRS+homeRA \over homeG} \over {roadRS+roadRA \over roadG}})}
743:
545:
487:
444:
402:
377:
35:
838:
773:
723:
660:
602:
597:
567:
459:
449:
434:
424:
43:
768:
763:
685:
479:
409:
39:
238:
or any other statistic to further analyze the park factor of an individual park.
783:
675:
492:
419:
823:
738:
612:
550:
698:
577:
562:
753:
397:
231:
38:
in a team's home and road games. Most commonly used as a metric in the
220:
315:
650:
808:
230:
In place of Runs scored and allowed, the formula can easily use
319:
46:
contributes to the offensive production of a team or player.
311:
Park
Factors for all MLB Parks on MLB.com - Updated Daily
295:
Earned run average § Sabermetrics treatment of ERA
57:
684:
631:
511:
478:
353:
209:
253:Glossary of baseball (P) § pitcher's park
331:
248:Glossary of baseball (H) § hitter's park
8:
338:
324:
316:
140:
78:
76:
56:
271:"RS" = runs scored; "RA" = runs allowed.
264:
34:that indicates the difference between
7:
49:The formula most commonly used is:
749:Jaffe Wins Above Replacement Score
14:
704:Batting average on balls in play
204:
73:
1:
804:Value over replacement player
734:Fielding independent pitching
861:
809:Weighted on-base average
618:Strikeout-to-walk ratio
465:Walk-to-strikeout ratio
814:Wins Above Replacement
794:Out of zone plays made
671:Defensive indifference
498:Stolen base percentage
211:
819:Win probability added
455:On-base plus slugging
282:On-base plus slugging
212:
22:, also simply called
799:Ultimate zone rating
719:Defensive Runs Saved
55:
845:Baseball statistics
709:Batting park factor
641:Fielding percentage
373:Slugging percentage
347:Baseball statistics
20:Batting Park Factor
759:Power–speed number
531:Pitchers of record
368:On-base percentage
207:
32:baseball statistic
16:Baseball statistic
832:
831:
779:Secondary average
729:Extrapolated Runs
202:
200:
138:
852:
666:Fielder's choice
430:Game-winning RBI
340:
333:
326:
317:
298:
291:
285:
278:
272:
269:
216:
214:
213:
208:
203:
201:
199:
182:
141:
139:
137:
120:
79:
77:
860:
859:
855:
854:
853:
851:
850:
849:
835:
834:
833:
828:
680:
627:
526:Innings pitched
521:Win–loss record
507:
503:Caught stealing
474:
470:Walk percentage
363:Batting average
349:
344:
307:
302:
301:
292:
288:
279:
275:
270:
266:
261:
244:
183:
142:
121:
80:
53:
52:
17:
12:
11:
5:
858:
856:
848:
847:
837:
836:
830:
829:
827:
826:
821:
816:
811:
806:
801:
796:
791:
786:
781:
776:
771:
766:
761:
756:
751:
746:
744:Isolated Power
741:
736:
731:
726:
721:
716:
711:
706:
701:
696:
690:
688:
682:
681:
679:
678:
673:
668:
663:
658:
653:
648:
643:
637:
635:
629:
628:
626:
625:
620:
615:
610:
605:
600:
595:
590:
585:
580:
575:
570:
565:
560:
555:
554:
553:
543:
538:
533:
528:
523:
517:
515:
509:
508:
506:
505:
500:
495:
490:
484:
482:
476:
475:
473:
472:
467:
462:
457:
452:
447:
445:Sacrifice bunt
442:
437:
432:
427:
422:
417:
412:
407:
406:
405:
403:Extra-base hit
400:
395:
390:
385:
375:
370:
365:
359:
357:
351:
350:
345:
343:
342:
335:
328:
320:
314:
313:
306:
305:External links
303:
300:
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273:
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257:
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206:
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195:
192:
189:
186:
181:
178:
175:
172:
169:
166:
163:
160:
157:
154:
151:
148:
145:
136:
133:
130:
127:
124:
119:
116:
113:
110:
107:
104:
101:
98:
95:
92:
89:
86:
83:
75:
72:
69:
66:
63:
60:
15:
13:
10:
9:
6:
4:
3:
2:
857:
846:
843:
842:
840:
825:
822:
820:
817:
815:
812:
810:
807:
805:
802:
800:
797:
795:
792:
790:
787:
785:
782:
780:
777:
775:
774:Runs produced
772:
770:
767:
765:
762:
760:
757:
755:
752:
750:
747:
745:
742:
740:
737:
735:
732:
730:
727:
725:
724:Exit velocity
722:
720:
717:
715:
714:Catcher's ERA
712:
710:
707:
705:
702:
700:
697:
695:
694:Adjusted ERA+
692:
691:
689:
687:
683:
677:
674:
672:
669:
667:
664:
662:
661:Total chances
659:
657:
654:
652:
649:
647:
644:
642:
639:
638:
636:
634:
630:
624:
621:
619:
616:
614:
611:
609:
606:
604:
603:Complete game
601:
599:
598:Quality start
596:
594:
591:
589:
586:
584:
581:
579:
576:
574:
571:
569:
566:
564:
561:
559:
556:
552:
549:
548:
547:
544:
542:
539:
537:
534:
532:
529:
527:
524:
522:
519:
518:
516:
514:
510:
504:
501:
499:
496:
494:
491:
489:
486:
485:
483:
481:
477:
471:
468:
466:
463:
461:
460:Times on base
458:
456:
453:
451:
450:Sacrifice fly
448:
446:
443:
441:
438:
436:
433:
431:
428:
426:
423:
421:
418:
416:
413:
411:
408:
404:
401:
399:
396:
394:
391:
389:
386:
384:
381:
380:
379:
376:
374:
371:
369:
366:
364:
361:
360:
358:
356:
352:
348:
341:
336:
334:
329:
327:
322:
321:
318:
312:
309:
308:
304:
296:
290:
287:
283:
277:
274:
268:
265:
258:
254:
251:
249:
246:
245:
241:
239:
237:
233:
228:
226:
222:
217:
196:
193:
190:
187:
184:
179:
176:
173:
170:
167:
164:
161:
158:
155:
152:
149:
146:
143:
134:
131:
128:
125:
122:
117:
114:
111:
108:
105:
102:
99:
96:
93:
90:
87:
84:
81:
70:
67:
64:
61:
58:
50:
47:
45:
41:
37:
33:
29:
25:
21:
769:Runs created
764:Range factor
708:
686:Sabermetrics
573:Perfect game
480:Base running
410:Hits per run
289:
276:
267:
229:
218:
51:
48:
27:
23:
19:
18:
784:Speed Score
676:Passed ball
493:Stolen base
420:Total bases
40:sabermetric
36:runs scored
24:Park Factor
824:Win Shares
739:Game score
613:Wild pitch
415:Grand slam
259:References
699:Base runs
578:No-hitter
563:Strikeout
232:home runs
71:∗
839:Category
754:Pop time
633:Fielding
513:Pitching
398:Home run
242:See also
225:pitching
219:In this
44:ballpark
608:Shutout
355:Batting
221:formula
30:, is a
651:Putout
646:Assist
623:Maddux
551:Earned
393:Triple
388:Double
383:Single
284:(OPS).
656:Error
293:See:
280:See:
789:NERD
588:BB/9
583:WHIP
568:Walk
541:Hold
536:Save
440:Bunt
435:Walk
236:hits
593:K/9
558:ERA
546:Run
488:Run
425:RBI
378:Hit
68:100
28:BPF
26:or
841::
234:,
339:e
332:t
325:v
297:.
205:)
197:G
194:d
191:a
188:o
185:r
180:A
177:R
174:d
171:a
168:o
165:r
162:+
159:S
156:R
153:d
150:a
147:o
144:r
135:G
132:e
129:m
126:o
123:h
118:A
115:R
112:e
109:m
106:o
103:h
100:+
97:S
94:R
91:e
88:m
85:o
82:h
74:(
65:=
62:F
59:P
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