Rotate an object so one side is straight?

I’m trying to rotate an object so that the top of it is “straight”. How can I do this exactly (vs just eye-balling it)?

This is in the macOS app.

I would make a straight box and then use the Align tool
on that face to align it to the box

I use this technique a lot for getting objects back onto the ground plane.

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Align tool is a good option as @Shaun mentioned. Only thing I want to add you don’t need another object to align to, you can use sketch or even plane for that.

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I did not realise that you could do that, thanks. I guess I’ve been stuck in my ways since before those planes became clickable. That’ll save me some time.