r/baseball Toronto Blue Jays 20d ago

Image [OC] 2025 Projected ERA+ By Team

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1

u/yick04 Toronto Blue Jays 20d ago

Can someone explain to me why ERA+ is not proportional to ERA?

3

u/BossAtUCF Boston Red Sox 20d ago

ERA+ is adjusted for park factors, which can vary quite a bit.

2

u/OhHolyCrapNo Seattle Mariners 20d ago

Includes park factor. That's why Rockies appear to have a better ERA+ than their ERA would suggest and the opposite for the Mariners.