Mile/Hour to Kilometer/Hour Converter
Convert Mile/Hour (mph) to Kilometer/Hour (km/h) instantly. 1 mph = 1.609344 km/h.
Speed Converter
18 units available
1 mph = 1.609344 km/h
Formula:
km/h = mph × 1.609344With your value: 1 mph = 1.609344 km/h
How big is that?
Everyday references on a logarithmic scale, all expressed in mile/hour so you can sanity-check the result.
Other Mile/Hour to Kilometer/Hour conversions
Mile/Hour to Kilometer/Hour Conversion Table
| Mile/Hour (mph) | Kilometer/Hour (km/h) |
|---|---|
| 0.5 | 0.804672 |
| 1 | 1.609344 |
| 2 | 3.218688 |
| 5 | 8.04672 |
| 10 | 16.09344 |
| 15 | 24.14016 |
| 20 | 32.18688 |
| 25 | 40.2336 |
| 50 | 80.4672 |
| 100 | 160.9344 |
| 250 | 402.336 |
| 500 | 804.672 |
| 1000 | 1,609.344 |
Kilometer/Hour to Mile/Hour Conversion Table
| Kilometer/Hour (km/h) | Mile/Hour (mph) |
|---|---|
| 0.5 | 0.310686 |
| 1 | 0.621371 |
| 2 | 1.242742 |
| 5 | 3.106856 |
| 10 | 6.213712 |
| 15 | 9.320568 |
| 20 | 12.427424 |
| 25 | 15.53428 |
| 50 | 31.06856 |
| 100 | 62.137119 |
| 250 | 155.342798 |
| 500 | 310.685596 |
| 1000 | 621.371192 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
Mile/Hour (mph)
Speed
Derived quantity: a defined length divided by a defined time interval.
Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)
Bureau International des Poids et Mesures · Reviewed 2026-07-01
Kilometer/Hour (km/h)
Speed
Derived quantity: a defined length divided by a defined time interval.
Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)
Bureau International des Poids et Mesures · Reviewed 2026-07-01
How to Convert Mile/Hour to Kilometer/Hour
To convert from Mile/Hour (mph) to Kilometer/Hour (km/h), multiply the value by 1.609344.
Formula: km/h = mph × 1.609344
Reverse: mph = km/h × 0.6213711922
Step-by-Step Example
- Start with your value in Mile/Hour. For example: 5 mph
- Multiply by the conversion factor: 5 x 1.609344
- The result is: 8.04672 km/h
About Mile/Hour
Miles per hour is the standard unit of speed in the US and UK for vehicles and weather reporting.
Common uses: speed limits (US/UK), vehicle speed, baseball.
About Kilometer/Hour
Kilometers per hour is the most widely used unit of speed for vehicles in most countries.
Common uses: speed limits, vehicle speed, weather.
Frequently Asked Questions
How many Kilometer/Hour are in 1 Mile/Hour?
There are exactly 1.609344 Kilometer/Hour in 1 Mile/Hour. This means the conversion factor from Mile/Hour to Kilometer/Hour is 1.609344.
What is the formula to convert Mile/Hour to Kilometer/Hour?
The formula to convert Mile/Hour to Kilometer/Hour is: km/h = mph × 1.609344. For example, to convert 10 Mile/Hour to Kilometer/Hour, you would multiply 10 by 1.609344.
What is a Mile/Hour?
Miles per hour is the standard unit of speed in the US and UK for vehicles and weather reporting.
What is a Kilometer/Hour?
Kilometers per hour is the most widely used unit of speed for vehicles in most countries.
What are the common uses of Mile/Hour?
The Mile/Hour is commonly used in speed limits (US/UK), vehicle speed, baseball.
Related Speed Conversions
Cite this page
UnitConvertLab. (2026). Mile/Hour to Kilometer/Hour converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/mph-to-kmph