Miles to Kilometers Converter (and Kilometers to Miles)

The exact miles to kilometers factor

One international mile is defined as exactly 1.609344 kilometers. The figure is exact because the mile is now defined from the meter: 5,280 feet, with each foot exactly 0.3048 meter. To convert miles to kilometers, multiply by 1.609344. To go from kilometers to miles, divide by 1.609344, or multiply by about 0.621371. No rounding appears in the factor itself, only in the answer you read off the screen. Short distances such as a 5K race or a 10 mile commute convert in the same way as long road trips, so you can use one method for running, driving and hiking maps.

Worked example: a marathon is 26.2 miles. Multiply 26.2 by 1.609344 and you get 42.165 kilometers, which matches the official 42.195 km course length once the exact 26 miles 385 yards is used. The tool shows the answer to two decimals at the top and three decimals in the detail rows, plus meters and feet so you can move between road signs and trail maps.

For quick mental math, add half and then a tenth: 10 miles is 10 + 5 + 1, or about 16 km, against the exact 16.09. Going from kilometers to miles, multiply by 0.6. Speed limits work the same way, since 60 mph is about 97 km/h. Driving abroad? The flight time calculator covers the air leg, and the inches to cm converter handles small lengths.

Runners, cyclists and drivers can scan this list to see the most common distances in both units at a glance. Reference table of common distances, plain HTML so it works without JavaScript.

Where these numbers come from

The formulas and default values in this calculator are based on:

• NIST SP 811 Appendix B8, conversion factors (nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8)
• NIST unit conversion guidance (nist.gov/pml/owm/metric-si/unit-conversion). Note: race distances in the table are rounded to three decimals

This is a planning estimate, not medical, legal or immigration advice. Fees, allowances, limits and entry rules change, so confirm the figures with your airline, cruise line, customs agency or the official government source before you book or travel, and follow their rules if they differ from this page.