# Convert 221 kilometers per hour to miles per hour

How many miles per hour are 221 kilometers per hour?

kilometers per hour (km/h)
221 kilometers per hour = 137.323 miles per hour

## Precise decimal and fraction answers

The conversion in miles per hour rounded to six significant decimal places is 221 km/h = 137.323033 mph. The precise fraction answer is 137 115/356 mph.

### Decimal Precision

Conversion from one to ten decimal places

• 221 km/h = 137.3 mph
• 221 km/h = 137.32 mph
• 221 km/h = 137.323 mph
• 221 km/h = 137.3230 mph
• 221 km/h = 137.32303 mph
• 221 km/h = 137.323033 mph
• 221 km/h = 137.3230335 mph
• 221 km/h = 137.32303348 mph
• 221 km/h = 137.323033484 mph
• 221 km/h = 137.3230334845 mph

## How many miles per hour is a kilometer per hour?

A kilometer per hour is slower than a mile per hour. 0.621 miles per hour is the same velocity as one kilometer per hour. A kilometer per hour is 62.14% the velocity a mile per hour. An object moving at a mile per hour is 60.93% faster than an object traveling at one kilometer per hour.

## Kilometers per hour to miles per hour conversion factor and formulas

Formula

The conversion factor between kilometers per hour and miles per hour is 1.609. This represents the ratio of kilometers per hour per one mile per hour. To calculate the value in miles per hour, we can either divide by the conversion factor or multiply by its inverse.

### Division

To convert from kilometers per hour to miles per hour, divide kilometers per hour by 1.609.
The formula is expressed as:
km/h ÷ 1.609 = mph

### Multiplication

Alternatively we can multiply by the inverse conversion factor to get the same result.
The inverse of 1.609 is 1/1.609 or 0.621. To convert from kilometers per hour to miles per hour, multiply kilometers per hour by 0.621.
The formula is expressed as:
km/h × 0.621 = mph

To convert 221 kilometers per hour to miles per hour, divide 221 kilometers per hour by 1.609.
221 km/h ÷ 1.609 = 137.323 mph

## How fast are 221 kilometers per hour?

Real world scale examples to visualize the velocity of 221 kilometers per hour / 137.323 miles per hour

• 1.96 times the typical automobile speed on a highway (70 mph)
• 69% of the typical speed of modern high speed train (200 mph)
• 25% of the typical cruising speed of a passenger jet (560 mph)

Converting kilometers per hour to miles per hour is a conversion between units from separate unit systems - kilometers per hour are metric (SI) defined units while miles per hour are US Customary / UK Imperial .

SI Unit

Within the SI (metric) system of measurement, a kilometer per hour (km/h) is the distance traveled in one hour as measured in kilometers (1,000 meters). It is commonly used as measurement of velocity over geographic distances. Kilometers per hour are commonly used to measure vehicle speed and speed limits. The official SI symbol is km/h, however kph and km/hr are also used.

Customary/Imperial Unit

Miles per hour is a velocity measurement within the US/UK Imperial systems. It is defined as the number of miles traveled in one hour. MPH is frequently used for measurement and regulation of vehicle speed limits in the US, UK and many British dependencies. The common symbols for miles per hour are mph, MPH or mi/hr.

## Reverse this conversion

Convert from miles per hour to kilometers per hour instead.

## 221 kilometers per hour to other speed units

### Metric

• 221 km/h = 221 km/h

### Imperial/U.S.

• 221 km/h = 137.323 mph
• 221 km/h = 119.33 kn

## References and Citations

1. International Bureau of Weights and Measures (BIPM) The International System of Units (SI)
2. National Institute of Standards and Technology (NIST) General Tables of Units of Measurement

## Decimal conversions for 221 km/h to mph

km/h mph
221.01 km/h 137.329 mph
221.02 km/h 137.335 mph
221.03 km/h 137.342 mph
221.04 km/h 137.348 mph
221.05 km/h 137.354 mph
221.06 km/h 137.36 mph
221.07 km/h 137.367 mph
221.08 km/h 137.373 mph
221.09 km/h 137.379 mph
221.1 km/h 137.385 mph
221.11 km/h 137.391 mph
221.12 km/h 137.398 mph
221.13 km/h 137.404 mph
221.14 km/h 137.41 mph
221.15 km/h 137.416 mph
221.16 km/h 137.422 mph
221.17 km/h 137.429 mph
221.18 km/h 137.435 mph
221.19 km/h 137.441 mph
221.2 km/h 137.447 mph
221.21 km/h 137.454 mph
221.22 km/h 137.46 mph
221.23 km/h 137.466 mph
221.24 km/h 137.472 mph
221.25 km/h 137.478 mph
221.26 km/h 137.485 mph
221.27 km/h 137.491 mph
221.28 km/h 137.497 mph
221.29 km/h 137.503 mph
221.3 km/h 137.509 mph
221.31 km/h 137.516 mph
221.32 km/h 137.522 mph
221.33 km/h 137.528 mph
221.34 km/h 137.534 mph
221.35 km/h 137.541 mph
221.36 km/h 137.547 mph
221.37 km/h 137.553 mph
221.38 km/h 137.559 mph
221.39 km/h 137.565 mph
221.4 km/h 137.572 mph
221.41 km/h 137.578 mph
221.42 km/h 137.584 mph
221.43 km/h 137.59 mph
221.44 km/h 137.596 mph
221.45 km/h 137.603 mph
221.46 km/h 137.609 mph
221.47 km/h 137.615 mph
221.48 km/h 137.621 mph
221.49 km/h 137.628 mph
221.5 km/h 137.634 mph
km/h mph
221.51 km/h 137.64 mph
221.52 km/h 137.646 mph
221.53 km/h 137.652 mph
221.54 km/h 137.659 mph
221.55 km/h 137.665 mph
221.56 km/h 137.671 mph
221.57 km/h 137.677 mph
221.58 km/h 137.683 mph
221.59 km/h 137.69 mph
221.6 km/h 137.696 mph
221.61 km/h 137.702 mph
221.62 km/h 137.708 mph
221.63 km/h 137.714 mph
221.64 km/h 137.721 mph
221.65 km/h 137.727 mph
221.66 km/h 137.733 mph
221.67 km/h 137.739 mph
221.68 km/h 137.746 mph
221.69 km/h 137.752 mph
221.7 km/h 137.758 mph
221.71 km/h 137.764 mph
221.72 km/h 137.77 mph
221.73 km/h 137.777 mph
221.74 km/h 137.783 mph
221.75 km/h 137.789 mph
221.76 km/h 137.795 mph
221.77 km/h 137.801 mph
221.78 km/h 137.808 mph
221.79 km/h 137.814 mph
221.8 km/h 137.82 mph
221.81 km/h 137.826 mph
221.82 km/h 137.833 mph
221.83 km/h 137.839 mph
221.84 km/h 137.845 mph
221.85 km/h 137.851 mph
221.86 km/h 137.857 mph
221.87 km/h 137.864 mph
221.88 km/h 137.87 mph
221.89 km/h 137.876 mph
221.9 km/h 137.882 mph
221.91 km/h 137.888 mph
221.92 km/h 137.895 mph
221.93 km/h 137.901 mph
221.94 km/h 137.907 mph
221.95 km/h 137.913 mph
221.96 km/h 137.92 mph
221.97 km/h 137.926 mph
221.98 km/h 137.932 mph
221.99 km/h 137.938 mph