npub18w…93yx3 on Nostr: Nifty. As they're pretty close to 0.6/1.6, I just add a half and a tenth to go km -> ...

Nifty. As they're pretty close to 0.6/1.6, I just add a half and a tenth to go km -> mi, and add that to the original value to go the other way mi -> km. Some prefer to divide by 5 then multiply by 3 (same 0.6 ratio) but I find 2 simple additions to be easier (for my brain).