Miles to Kilometers Converter

Directions and road signs in mile-based countries often give short distances as fractions: an exit in a quarter mile, a turn in half a mile. You can type the fraction just as the sign shows it, such as 1/4, or its decimal, 0.25. Then multiply the kilometer answer by 1,000 to picture it in meters:

Mixed distances go in with a space between the whole miles and the fraction: 1 1/2 converts to 2.414 km. Leave out the word "mile" and any hyphen, as in 1-1/2, since the field can't read those and shows a note instead of a result.

Running and cycling plans written in miles need converting if your watch or app is set to kilometers. Convert the weekly totals, not just the long run, so the whole plan stays in proportion. A 25-mile week becomes 40.2336 km, which you would log as 40.2.

Pace converts in the opposite direction from distance. A minute-per-mile pace becomes a shorter minute-per-kilometer pace, so you divide by 1.609344 rather than multiply. A 9:00 per mile pace is 540 seconds ÷ 1.609344 = 335.5 seconds, or about 5:36 per km. Entering 9 into this converter would give 14.4841, which is the distance in kilometers of 9 miles, not a pace.

Multiplying by 1.6 is the familiar estimate and is 0.58% low. You can almost erase that error with one extra step: multiply by 1.6, then add 1% of the original miles. That is the same as multiplying by 1.61, which is only 0.04% high.

• 40 miles: 64 + 0.4 = 64.4 km (exact 64.3738)
• 250 miles: 400 + 2.5 = 402.5 km (exact 402.34)
• 26 miles: 41.6 + 0.26 = 41.86 km (exact 41.8429)

On a 250-mile drive the plain 1.6 shortcut is 2.3 km short; the adjusted version is about 160 m long.