The only metric to imperial conversion I remember is kilometers to miles since it’s pretty close to the golden ratio.
Even if you don’t remember that the golden ratio is 1.6 and a bit, you can approximate it by using successive terms of the Fibonacci sequence.
1, 1, 2, 3, 5, 8, 13 …
So 8 miles is about 13km (actually 12.87)
Tf did I do to you that I earned a call out like this? 😭