How many miles are equal to 4 kilometers?

About ##2.5## miles

The exact conversion factor is:

##1color(white)(.)"mile" = 1.609344color(white)(.)"km"##

Since this is close to ##1.6 = 8/5## we can reckon that:

##4color(white)(.)"km" ~~ 5/8 * 4color(white)(.)"miles" = 2.5color(white)(.)"miles"##

If the ##4color(white)(.)"km"## figure were accurate then the miles figure would be closer to:

##4/1.609344 ~~ 2.4855color(white)(.)"miles"##