Miles per hour to Kilometers per hour Converter

How to convert miles per hour to kilometers per hour

1. 1

   Take your value

   Start with your value in miles per hour.

2. 2

   Multiply by 1.60934

   Multiply the mile per hour value by 1.60934. This is the exact conversion factor from miles per hour to kilometers per hour.

3. 3

   Read the result

   The product is your value in kilometers per hour. For example, 5 mph × 1.60934 = 8.04672 km/h.

Conversion formula

The exact factor from miles per hour to kilometers per hour is 1.60934.

Kilometers per hour = Miles per hour × 1.60934

Miles per hour to Kilometers per hour conversion table

Fifty common reference values, hand-picked for skim utility. Use the calculator above for any value not listed.

Real-world reference

US Interstate speed limits are usually 65–75 mph. A 4-minute mile is exactly 15 mph. In kilometers per hour, that gives you: 1 mph = 1.60934 km/h, 10 mph = 16.0934 km/h, 100 mph = 160.934 km/h.

Frequently asked questions

How many kilometers per hour are in 1 mile per hour?

1 mile per hour equals 1.60934 kilometers per hour.

How do I convert miles per hour to kilometers per hour?

Multiply the mile per hour value by 1.60934. So x mph × 1.60934 = the equivalent in km/h.

What is 5 miles per hour in kilometers per hour?

5 miles per hour equals 8.04672 kilometers per hour.

What is 10 miles per hour in kilometers per hour?

10 miles per hour equals 16.0934 kilometers per hour.

What is 100 miles per hour in kilometers per hour?

100 miles per hour equals 160.934 kilometers per hour.

How do I convert back from kilometers per hour to miles per hour?

Multiply the kilometer per hour value by 0.621371. For example, 1 km/h = 0.621371 mph.

Is the mile per hour bigger than the kilometer per hour?

Yes. 1 mile per hour is larger than 1 kilometer per hour — specifically 1.60934 times larger.

Are these conversion factors exact?

Yes. Since the 1959 international yard and pound agreement, imperial/US units are defined exactly in terms of metric units, so the factor used here (1.60934) is exact within IEEE 754 double precision.

About the mile per hour and the kilometer per hour

Sources

• NIST Special Publication 811 — Guide for the Use of the International System of Units (SI)
• BIPM — SI Brochure (9th edition)
• Reverse: km/h to mph
• All speed converters