How can I explain focal length to someone who isn’t into photography?

Context

So my friends and family are curious about how far my lens can reach. I usually explain with focal length and show them a few pictures.

Question

Is there any easier way to explain what 300mm can get to someone that’s not into photography? Is there a formula that states that I can fill the frame of a subject at X meter height and Y meter distance away with effective focal length Zmm?

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