> So what does this have to do with kilometres to miles? Well, the ratio of km to mi is 1.609 to 1. Since 1.609 is so close to the golden ratio, you can use the Fibonacci numbers to convert between kilometres and miles! For example, 5 km is quite close to 3 miles (3.1 mi). 8 km is almost exactly 5 miles, 13 km is 8 miles, 21 km is 13 miles, etc! I think this is awesome.