MPH to KPH Converter

Multiply miles per hour by 1.60934 to get kilometers per hour. For example, 60 mph = 96.56 kph. Quick estimate: add 60% to the mph value. 1 kph = 0.621 mph.

Miles per Hour

mph

Kilometers per Hour

kph

Common Conversions

Key Takeaways

1 mph = 1.60934 kph. Multiply mph by 1.609 to convert to kph.
1 kph = 0.621371 mph. Divide kph by 1.609 to convert to mph.
Quick estimate: multiply mph by 1.6 or add 60% to the mph value.
Common speed limits: 30 mph = 48 kph, 55 mph = 89 kph, 65 mph = 105 kph, 70 mph = 113 kph.
Most countries use kph. Only the US, UK, and a few territories use mph.

How Do You Convert MPH to KPH?

Multiply the speed in miles per hour by 1.60934 to get kilometers per hour. The formula is: KPH = MPH × 1.60934. To convert in the other direction, divide kph by 1.60934 (or multiply by 0.621371). The conversion factor is the same as the miles-to-kilometers factor because both units measure the same thing: distance per unit of time.

Sam Okafor from Pinewood Falls rents cars frequently when traveling to Canada for real estate conferences. Canadian speed limit signs are in kph, so he does the mental math: a 100 kph sign means 62 mph — just slightly above the 60 mph he is used to on US highways. He keeps a quick reference card in his wallet: 50 kph = 31 mph (city), 80 kph = 50 mph (regional), 100 kph = 62 mph (highway), 110 kph = 68 mph (expressway).

Speed Limit Comparison Table

Common US speed limits converted to kph, and common metric speed limits converted to mph.

US Speed Limit (mph)	Equivalent (kph)	Typical Setting
15 mph	24 kph	School zone
25 mph	40 kph	Residential neighborhood
35 mph	56 kph	City street
45 mph	72 kph	Suburban road
55 mph	89 kph	Two-lane highway
65 mph	105 kph	Interstate highway
70 mph	113 kph	Rural interstate
75 mph	121 kph	Western US interstate
85 mph	137 kph	Texas State Highway 130 (highest US limit)

When Do You Need This Conversion?

Driving Abroad

When renting a car in Canada, Mexico, Europe, or most other countries, speed limit signs are in kph. Knowing the conversion prevents speeding tickets. A 130 kph sign on a French autoroute means 80.8 mph — faster than most US interstate limits. A 50 kph sign in a European city means 31 mph — slower than many US residential limits.

Sports and Athletics

Baseball pitch speeds are reported in mph in the US but kph in Japan and other countries. A 100 mph fastball is 160.9 kph. Coach Rivera at Pinewood Falls High tracks his pitchers' speeds and occasionally compares them to NPB (Japanese league) standards, where elite fastballs reach 160 kph (99.4 mph).

Weather Reports

Wind speeds in weather reports use different units depending on the country. US reports use mph, but international aviation and meteorology often use knots (1 knot = 1.852 kph = 1.151 mph). Hurricane categories are defined in mph in the US: Category 1 starts at 74 mph (119 kph).

Common Speed References

Reference	MPH	KPH
Walking speed	3.1 mph	5 kph
Jogging speed	6.2 mph	10 kph
Usain Bolt top speed	27.8 mph	44.7 kph
City speed limit	30 mph	48 kph
Highway speed	65 mph	105 kph
100 mph fastball	100 mph	161 kph
F1 race car top speed	230 mph	370 kph
Commercial jet	575 mph	925 kph
Speed of sound	767 mph	1,235 kph

This converter uses standard conversion factors. For specialized or regulatory applications, consult the relevant standards for your industry.

Frequently Asked Questions

How do I convert mph to kph?

Multiply miles per hour by 1.60934 to get kilometers per hour. For example, 60 mph = 60 × 1.60934 = 96.56 kph. For a quick estimate, multiply by 1.6 or add 60% to the mph value.

What is 100 kph in mph?

100 kph equals 62.14 mph. The 100 kph speed limit common in many countries is slightly faster than the 60 mph limit on many US highways.

Why does the US use mph instead of kph?

The US never fully adopted the metric system. While Congress passed the Metric Conversion Act in 1975, it was voluntary. The UK also uses mph despite being partially metric. Most other countries switched to kph as part of broader metrication efforts in the mid-20th century.

What is the speed of sound in mph and kph?

The speed of sound at sea level is approximately 767 mph or 1,235 kph (Mach 1). This varies with temperature and altitude. At cruising altitude, it is lower at about 660 mph (1,062 kph).

What countries use mph?

The United States, United Kingdom, and a handful of other countries and territories use miles per hour. These include the US Virgin Islands, Puerto Rico, Guam, and some Caribbean nations. The vast majority of countries use kilometers per hour.