Work out square kilometre to square mile instantly with clear inputs, formula shown and shareable results.
Converting Square kilometres to Square miles is a single multiplication: one km² equals 0.38610216 mi², so the amount is multiplied by that factor. Switching the direction divides by the same factor instead. This factor is an exact definition, not a rounded approximation, so the conversion is precise at any scale.
Square kilometres → Square miles
mi² = km² × 0.38610216
Square miles → Square kilometres
km² = mi² ÷ 0.38610216
One km² is 0.38610216 mi². That figure is exact by definition.
Divide by 0.38610216 instead of multiplying — or just switch the direction selector, which does it for you.