KM/H to MPH Converter
Convert kilometres per hour to miles per hour: 1 km/h = 0.621371 mph. Exact factor, formula and a conversion chart.
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Result
- 1 km/h
- 0.621371 mph
- 1 mph
- 1.60934 km/h
How it's calculated
miles per hour = kilometres per hour × 0.621371
To convert km/h to mph, divide by 1.60934.
km/h in every unit
| metre per second | 0.277778 m/s |
| mile per hour | 0.621371 mph |
| knot | 0.539957 kn |
| foot per second | 0.911344 ft/s |
km/h to mph conversion chart
| kilometre per hour (km/h) | mile per hour (mph) |
|---|---|
| 1 km/h | 0.621371 mph |
| 2 km/h | 1.24274 mph |
| 3 km/h | 1.86411 mph |
| 4 km/h | 2.48548 mph |
| 5 km/h | 3.10686 mph |
| 6 km/h | 3.72823 mph |
| 7 km/h | 4.3496 mph |
| 8 km/h | 4.97097 mph |
| 9 km/h | 5.59234 mph |
| 10 km/h | 6.21371 mph |
| 12 km/h | 7.45645 mph |
| 15 km/h | 9.32057 mph |
| 20 km/h | 12.4274 mph |
| 25 km/h | 15.5343 mph |
| 50 km/h | 31.0686 mph |
| 100 km/h | 62.1371 mph |
How many miles per hour are in 1 kilometre per hour?
1 kilometre per hour = 0.621371 miles per hour. To convert kilometres per hour to miles per hour, divide by 1.60934. For example, 10 km/h = 6.21371 mph and 100 km/h = 62.1371 mph. Enter any value above for an exact result.
The Unit Converter changes a value from one unit to another across 11 kinds of measurement: length, weight, temperature, volume, area, speed, time, digital storage, energy, pressure and fuel economy. It covers metric units (centimetres, kilograms, litres), US and UK imperial units (inches, pounds, gallons) and everyday ones such as cups, stones, acres and kilowatt-hours.
Conversions use the official definitions — 1 inch is exactly 2.54 cm, 1 pound exactly 0.45359237 kg, 1 US gallon exactly 3.785411784 litres — and the page shows the factor, the formula, the value in every other unit and a chart of common values, so you can check or reuse the numbers.
When to use it
- Converting height and weight between metric and imperial (cm ↔ feet and inches, kg ↔ lbs).
- Cooking with recipes from another country (cups, tablespoons, ml, grams, ounces).
- Reading weather and oven temperatures in Celsius or Fahrenheit.
- Property sizes in square feet, square metres, acres and hectares.
- File sizes (MB ↔ GB), fuel economy (mpg ↔ L/100 km) and tyre pressure (psi ↔ bar).
Tips for better results
- US and UK gallons and pints differ by about 20% — check which one a recipe or car manual uses.
- Temperature is not a simple multiplication: use the formula shown (°F = °C × 9/5 + 32).
- Storage makers use 1 GB = 1,000 MB, while some operating systems show GiB (1,024 MiB) — both are listed.
How to use the Unit Converter
- Choose the measurement, such as length or temperature.
- Enter the value and pick the units to convert from and to.
- Read the result, the value in every other unit and the conversion chart below.
Frequently asked questions
How do I convert kilometres per hour to miles per hour?
To convert kilometres per hour to miles per hour, divide by 1.60934. For example, 10 km/h = 6.21371 mph.
How do I convert miles per hour back to kilometres per hour?
Press the swap button between the units. 1 mph = 1.60934 km/h.
Is the conversion exact?
Yes. It uses the official definitions of the units; results are only rounded to six significant digits for display.
Are the conversions exact?
Yes. Units are converted with their defined factors — for example 1 inch is exactly 2.54 cm and 1 pound is exactly 0.45359237 kg — and results are rounded to six significant digits only for display.
Are cups and gallons US or UK?
Cups, pints, quarts and gallons are US customary units unless marked UK. UK (imperial) gallons and pints are listed separately because they are about 20% larger.
How many centimetres are in an inch?
Exactly 2.54 cm. To convert inches to centimetres, multiply by 2.54; to convert centimetres to inches, divide by 2.54.
How do I convert kilograms to pounds?
Multiply by 2.20462 (1 kg = 2.20462 lb). To convert pounds to kilograms, multiply by 0.453592.