One good thing has come from the stock market rout

The stock market has been getting slammed. As of Tuesday’s close, the S&P 500 was down 12.5% from its all-time high of 2,134, which it set on May 20.

But there’s some good news for investors with cash to allocate: valuations have gotten a lot more attractive.

The price/earnings (PE) ratio — the price of the S&P 500 divided by the earnings of those S&P 500 companies — is probably the most popular way to measure value in the stock market. And because prices have come down so much, so have those valuations.

“[T]he valuation correction does seem in place,” Citi’s Tobias Levkovich wrote.

In a new note to clients, Deutsche Bank’s David Bianco notes that “valuation is back to normal.” The PE based on trailing 12-month earnings is back to its long-run average. While the PE based on expected earnings for the next 12 months remains a hair above average, Bianco thinks it’s nevertheless attractive.

“We think the S&P finishes 2015 between 2100-2200, we reiterate our 2150 target and switch our tactical call from likely “Next 5%+” S&P price move to Up from Down since December,” Bianco said.

“The forward PE is 15X currently, lower than the implied PE of corporate bonds (inverse of yield) and barely above HY (which is barely at a discount),” FundStrat’s Tom Lee said on Tuesday. “[S]tocks are -0.6 standard deviation from long term average, or cheap.”

Barclays’ Jonathan Glionna also pounced on this.

“[T]he S&P 500 PE ratio fell to 15.5x, a level not seen since October of last year,” Glionna wrote on Tuesday. “As shown in our poster report titled Is 17x earnings expensive?, the S&P 500 total return for the next 12 months has averaged over 11% and 20% for PE ratios of 15x and 16x, respectively.”

To be clear, valuations don’t offer a lot of predictive power when it comes to next-12-month returns. Indeed, they tend to drift for long periods of time, which means that prices could keep falling making valuations even more attractive. But for the longer-term investor who’s willing and able to weather some volatility, the entry-point hasn’t looked this good in months.

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