Convert miles to kilometres

Formula: km = mi × 1.6093

mi to km quick reference table

Everyday mi values, converted

• 3.1 mi = 4.989 km — a 5K in miles.
• 26.2 mi = 42.1648 km — a marathon in miles.
• 60 mi = 96.5606 km — an hour of highway driving.

Where mi to km comes up

Length conversions come up in DIY and construction, screen and print sizing, running distances, and clothing or furniture measurements ordered from abroad. Mixed-unit plans are the usual reason a cut ends up wrong.

Doing mi to km in your head

Add half again plus a tenth, or use the 5:8 rule in reverse — 8 kilometres is about 5 miles. 10 miles becomes roughly 16 km.

Precision and rounding

One mile is exactly 1.6093 kilometres under the current definitions of both units, so the only judgement call is how many digits you keep. Two decimal places is already finer than most household scales and tape measures can read, while engineering and medical work usually keeps the full factor and rounds once at the end rather than at every step.