Question about calculating ERA from Cardinals pitching lines

[Austin_Gledson]

I was checking some Cardinals pitching stats and ran into a problem while trying to verify the ERA myself.

Some pitching lines show innings like **5.1 IP** or **6.2 IP**. These are not normal decimal numbers. **5.1 IP means 5 innings and 1 out, or 5⅓ innings, while 6.2 IP means 6 innings and 2 outs, or 6⅔ innings.**

Treating them as regular decimals can produce an incorrect ERA. I’ve been double-checking a few pitching lines with https://eracalculators.com/ , but I want to make sure I’m handling the innings conversion correctly.

When you calculate or verify a Cardinals pitcher’s ERA from a box score, do you convert the innings into total outs or fractional innings first, or do you usually rely on the ERA already listed in the stats?

[Bob Reed]

Let’s take a concrete example.
Liam Doyle’s last 10 starts in AA, he allowed 8 earned runs in 50.2 innings. To compute the ERA, take 8, divide the 8 by 50.667 (50 and 2/3 IP), then multiply by 9. That leaves the ERA as 1.42, I trust you’ll find.

[Brian Walton]

He knows the answer. He is trying to direct traffic to his site. Blocked.

[Author]

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