Kilometers per Hour to Miles per Hour
1 km/h = 0.621371 mph. Metric speed limits for US drivers. Change the value and the result updates as you type.
Result
- Result
- 62.137119 mph
- Formula
100 km/h × 0.621371 = 62.137119 mph
- All units
27.777778 m/s 100 km/h 62.137119 mph 53.99568 kn 91.134442 ft/s
Popular quick answers
How to use this tool
- Enter the speed as a number.
- Choose the unit you have on the left and the unit you want on the right.
- Read the result and the formula; press Copy to put the value on your clipboard.
- Use the table underneath to compare the same speed in every unit at once.
Good to know
- The international nautical mile (1,852 m) and the statute mile (1,609.344 m) are used.
Frequently asked questions
How do I convert mph to km/h?
Multiply miles per hour by 1.609344, because a mile is exactly 1,609.344 meters. So 60 mph is 96.56 km/h and 100 km/h is about 62.14 mph. A quick mental shortcut is to multiply mph by 1.6 or divide km/h by 1.6.
What is a knot?
One knot is one nautical mile per hour, and a nautical mile is 1,852 meters, so 1 knot is 1.852 km/h or about 1.151 mph. Ships, aircraft and weather reports use knots because a nautical mile matches one minute of latitude on a chart.
How do I convert m/s to km/h?
Multiply by 3.6, since there are 3,600 seconds in an hour and 1,000 meters in a kilometer. A 10 m/s wind is 36 km/h. To go from km/h back to m/s, divide by 3.6.
Why is 88 feet per second exactly 60 mph?
A mile is 5,280 feet and an hour is 3,600 seconds, so 60 mph is 60 × 5,280 ÷ 3,600 = 88 ft/s. Engineers and physics classes use feet per second for this reason, and the converter reproduces the exact value.
Results are estimates for general information. Double-check anything important with an official source.