Hot tech stocks Facebook (FB) - Get Facebook, Inc. Class A Report , Apple (AAPL) - Get Apple Inc. (AAPL) Report and Alphabet (GOOGL) - Get Alphabet Inc. Class A Report are all cheap relative to analysts' 2018-19 earnings expectations, Jim Cramer says.

"I do believe they represent the kind of high-growth stocks we need to own long term," Cramer said in a private conference call with members of his Action Alerts PLUS club for investors.

Cramer said the trio -- whose trailing price-to-earnings ratios all exceed the S&P 500's average -- actually cost less than consumer blue chips Clorox (CLX) - Get Clorox Company Report , Kimberly Clark (KMG) and Procter & Gamble (PG) - Get Procter & Gamble Company Report when looking at 2018-19 earnings estimates.

Clorox cleaned up in the latest quarter.

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"Apple is cheap on 2017 earnings, [and] all three are cheaper than any of the big consumer-package-good stocks that are regarded as safe stocks," he said. "All three also could be big winners when it comes to [proposed U.S. tax-law changes covering] repatriation -- taking net cash back."

Cramer owns FB, AAPL and GOOGL in his charitable trust.

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