Unit converter
Kilometers per hour to Miles per hour
Instant conversion in your browser — speed.
≈ 0.6214 mph
Tip: enter the values one by one — 40 30 55 20 — and you get the total and the average.
1 km/h = 0.6213711923 mph
Quick table Kilometers per hour → Miles per hour
| km/h | mph |
|---|---|
| 1 | 0.6213711923 |
| 5 | 3.106855961 |
| 10 | 6.213711923 |
| 25 | 15.53427981 |
| 50 | 31.06855961 |
| 100 | 62.13711923 |
| 500 | 310.6855961 |
| 1,000 | 621.3711923 |
All unit families
- Lengthmm · cm · m · km · in · ft · yd · miAlmost the whole world measures length in metres. The exceptions are narrow but stubborn: the United States uses feet and inches for everyday distances, and the United Kingdom still posts road signs in miles while selling timber in millimetres.
- Weight / Massmg · g · kg · t · oz · lb · stThe kilogram is the base unit, and until 2019 it was the last one still defined by a physical object: a platinum-iridium cylinder kept near Paris. It is now defined through the Planck constant, so it can be reproduced in any properly equipped laboratory.
- Temperature°C · °F · KTemperature is the one family here that is not a multiplication. Celsius and Fahrenheit have different zero points as well as different step sizes, so you need the formula: °F = °C × 9/5 + 32.
- Volumeml · l · m³ · gal · pt · fl oz · cupThis is the family where the same word means two different amounts. American and British measures share their names but not their sizes, and a recipe that ignores the difference will not work.
- Aream² · km² · ha · ft² · acAreas are where a linear conversion quietly goes wrong. One metre is 3.28 feet, but one square metre is 10.76 square feet — the factor is squared. Converting the sides and forgetting the square is the single most common mistake in this family.
- Times · min · h · d · wk · mo · yrSeconds, minutes, hours, days and weeks convert exactly. Months and years do not, and no converter can make them.
- Digital storagebit · B · KB · MB · GB · TBDigital storage has two conflicting definitions of the same prefixes, and almost every confusion about file sizes comes from that.
About this conversion
One km/h is 0.621371 mph, and the round trip is worth remembering the other way too: 161 km/h is 100 mph almost exactly (100.04). Between those, the values people look up are rarely round — a speedometer reads 24, a limit says 45, a train timetable claims 269. The table covers what actually gets searched rather than the powers of ten.
| km/h | mph |
|---|---|
| 12 km/h | 7.5 mph |
| 13 km/h | 8.1 mph |
| 24 km/h | 14.9 mph |
| 30 km/h | 18.6 mph |
| 45 km/h | 28.0 mph |
| 60 km/h | 37.3 mph |
| 80 km/h | 49.7 mph |
| 90 km/h | 55.9 mph |
| 120 km/h | 74.6 mph |
| 130 km/h | 80.8 mph |
| 160 km/h | 99.4 mph |
| 161 km/h | 100.0 mph |
| 170 km/h | 105.6 mph |
| 198 km/h | 123.0 mph |
| 200 km/h | 124.3 mph |
| 269 km/h | 167.1 mph |
| 300 km/h | 186.4 mph |
| 320 km/h | 198.8 mph |
Frequently asked questions
How do you convert kilometers per hour to miles per hour?
To go from km/h to mph: multiply by 0.6213711923 (1 km/h = 0.6213711923 mph). Example: 3 km/h = 1.864113577 mph. The converter above runs the math live as you type.
How much is 2 kilometers per hour in miles per hour?
2 km/h equals 1.242742385 mph. For other values, use the quick table or type your own number into the converter.
What is kilometers per hour (km/h)?
Kilometers per hour is the road-speed unit of most of the world: how many km you cover in one hour. Highway limits are typically 100-130 km/h; a sprinting human peaks around 37 km/h.
What is miles per hour (mph)?
Miles per hour is the speed unit of US and UK roads. A 70 mph motorway limit equals about 113 km/h; hurricanes are also classified by mph wind speeds.