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Every park is measured against an average one. A park at 1.18× gives up that outcome 18% more often than average, and the card prints the same thing as +18%. A park at 0.92× gives it up 8% less often, and prints as −8%. An average park is 1.00×, or 0%.
Each number is per plate appearance, adjusted for who hit and pitched there, over up to three seasons of the park’s current layout, with this season counting most. A slugging home team does not make its own park look friendly, and a great rotation does not make it look tough.
Park factors reflect ballpark only — weather is shown separately and not included in these values.
HR — home run rate. XBH — extra-base hit rate (2B + 3B + HR). HIT — total hit rate (1B + 2B + 3B + HR).
Switch between All Hitters, vs Righties and vs Lefties. Each side is compared with the league average for hitters on that same side, so a park that helps left-handed hitters specifically — the short porch in right field at Yankee Stadium — shows up rather than being averaged away.
A team that moves its fences or plays in a new ballpark starts over from the change, so old seasons never blur the new shape. A new layout starts from a published estimate of the change, or from average when there is none, and its own games take over as they add up — by midseason they count for more. The line under each card says which seasons the numbers cover.
Tuesday · 1:00 PM
PHIAway
ATLPark factors
HR
0%
1.00×
XBH
-3%
0.97×
HIT
+2%
1.02×
How this park compares with an average one. 1.00× is average.
2024–2026 · 17,852 plate appearances
Tuesday · 4:00 PM
CWSAway
HOUPark factors
HR
+9%
1.09×
XBH
+2%
1.02×
HIT
-3%
0.97×
How this park compares with an average one. 1.00× is average.
2024–2026 · 17,843 plate appearances
Tuesday · 7:00 PM
BOSAway
NYYPark factors
HR
+15%
1.15×
XBH
+5%
1.05×
HIT
-3%
0.97×
How this park compares with an average one. 1.00× is average.
2024–2026 · 17,676 plate appearances
Tuesday · 9:00 PM
CHCAway
SDPark factors
HR
+2%
1.02×
XBH
-8%
0.92×
HIT
-6%
0.94×
How this park compares with an average one. 1.00× is average.
2024–2026 · 17,554 plate appearances
How each of the day’s ballparks treats home runs, extra-base hits and hits, with the weather for the game. Park effects are large and stable, and easy to forget once you are deep in a matchup.
HR, XBH and HIT compare the park with an average one, per plate appearance and adjusted for who hit and pitched there, over up to three seasons of its current layout, with this season counting most. +18% means that outcome happens 18% more often there; the smaller number says the same as a multiple, where 1.00× is average. Green favors hitters, red favors pitchers. A hard place to homer can still be a good place for doubles. Weather is not part of those numbers.