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Check out Qalculate![1] for a program that does that and much more (though obviously not as much as WA).

I usually use Google for quick calculations but get annoyed when it only returns large results in scientific notation. WolframAlpha gives results in just about every conceivable way, e.g. "7 trillion" or "7 000 000 000 000" instead of 7e+12. Much nicer for someone like me who isn't used to scientific notation.

But Spotlight is just cmd-space away at all times. My only complaint is that I can't get results for date-based queries like "days since 17 Jan 2021" or "50 days from today" and I have to go to Google for those although I can at least just hit return after entering the query to have the result pop up in Safari.