Miles per hour to Kilometers per hour Converter

How many kilometers per hour in 1 mph?

1 mph = 1.609344 km/h. The other way round: 1 km/h = 0.6213711922 mph. Miles per hour is the speed unit on road signs in the US and the UK; 1 mph is exactly 1.609344 km/h. Kilometres per hour is the road speed unit in nearly every country; 1 km/h is exactly 1/3.6 m/s.

Miles per hour to kilometers per hour conversion table

1 mph = 1.6093 km/h · 2 mph = 3.2187 km/h · 3 mph = 4.828 km/h · 4 mph = 6.4374 km/h · 5 mph = 8.0467 km/h · 6 mph = 9.6561 km/h · 7 mph = 11.2654 km/h · 8 mph = 12.8748 km/h · 9 mph = 14.4841 km/h · 10 mph = 16.0934 km/h · 12 mph = 19.3121 km/h · 15 mph = 24.1402 km/h · 20 mph = 32.1869 km/h · 25 mph = 40.2336 km/h · 30 mph = 48.2803 km/h · 40 mph = 64.3738 km/h · 50 mph = 80.4672 km/h · 75 mph = 120.7008 km/h · 100 mph = 160.9344 km/h · 1,000 mph = 1,609.344 km/h

How to convert miles per hour to kilometers per hour

Multiply the value by 1.609344. Example: 37 mph = 59.5457 km/h.

Unit Converter

• cm → in
• in → cm
• ft → m
• m → ft
• ft → cm
• cm → ft
• kg → lb
• lb → kg
• °C → °F
• °F → °C
• km → mi
• mi → km
• L → gal
• gal → L
• ml → fl oz
• fl oz → ml
• g → oz
• oz → g
• m² → ft²
• ft² → m²
• mph → km/h
• km/h → mph
• MB → GB
• GB → MB
• GB → TB
• TB → GB
• st → kg
• kg → st
• mm → in
• in → mm
• yd → m
• m → yd
• ac → ha
• ha → ac
• kcal → kJ
• kJ → kcal
• bar → psi
• psi → bar

How to use

1. 1Pick a category — length, weight, temperature, volume, area, speed, data, time, pressure or energy.
2. 2Choose the “from” and “to” units, or press swap to reverse them.
3. 3Type a value in either field — the other side updates as you type.
4. 4Adjust the decimal precision and check the conversion table for common values.

Exact conversion factors

Many imperial units are defined exactly in metric terms: 1 inch = 2.54 cm, 1 foot = 0.3048 m, 1 mile = 1.609344 km, 1 pound = 0.45359237 kg and 1 US gallon = 3.785411784 litres. The converter uses these definitions, so results are as precise as the decimals you choose to show. The formula is displayed in words — for example “multiply by 2.54” — so you can repeat the calculation by hand.

Temperature is different

Celsius, Fahrenheit and Kelvin do not share a zero point, so temperature cannot be converted with a single factor. °F = °C × 9/5 + 32 and °C = (°F − 32) × 5/9; Kelvin is Celsius + 273.15. That is why 0 °C is 32 °F, while a 10-degree change in Celsius is an 18-degree change in Fahrenheit.

US vs UK units and data sizes

A US gallon (3.785 L) is smaller than an imperial UK gallon (4.546 L), and US fluid ounces differ slightly from UK ones — check which system your recipe or spec uses. For data sizes, storage makers use decimal units (1 GB = 1,000 MB), while operating systems often count in binary units (1 GiB = 1,024 MiB), which is why a new drive shows less capacity than the label.

Frequently asked questions

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