# Convert 21 kilometers per hour to knots

How many knots are 21 kilometers per hour?

kilometers per hour (km/h)
21 kilometers per hour = 11.339 knots

## Precise decimal and fraction answers

The conversion in knots rounded to six significant decimal places is 21 km/h = 11.339093 kn. The precise fraction answer is 11 157/463 kn.

### Decimal Precision

Conversion from one to ten decimal places

• 21 km/h = 11.3 kn
• 21 km/h = 11.34 kn
• 21 km/h = 11.339 kn
• 21 km/h = 11.3391 kn
• 21 km/h = 11.33909 kn
• 21 km/h = 11.339093 kn
• 21 km/h = 11.3390929 kn
• 21 km/h = 11.33909287 kn
• 21 km/h = 11.339092873 kn
• 21 km/h = 11.3390928726 kn

## How many knots is a kilometer per hour?

A kilometer per hour is slower than a knot. 0.54 knots is the same velocity as one kilometer per hour. A kilometer per hour is 54.00% the velocity a knot. An object moving at a knot is 85.2% faster than an object traveling at one kilometer per hour.

## Kilometers per hour to knots conversion factor and formulas

Formula

The conversion factor between kilometers per hour and knots is 1.852. This represents the ratio of kilometers per hour per one knot. To calculate the value in knots, we can either divide by the conversion factor or multiply by its inverse.

### Division

To convert from kilometers per hour to knots, divide kilometers per hour by 1.852.
The formula is expressed as:
km/h ÷ 1.852 = kn

### Multiplication

Alternatively we can multiply by the inverse conversion factor to get the same result.
The inverse of 1.852 is 1/1.852 or 0.54. To convert from kilometers per hour to knots, multiply kilometers per hour by 0.54.
The formula is expressed as:
km/h × 0.54 = kn

To convert 21 kilometers per hour to knots, divide 21 kilometers per hour by 1.852.
21 km/h ÷ 1.852 = 11.339 kn

## How fast are 21 kilometers per hour?

Real world scale examples to visualize the velocity of 21 kilometers per hour / 11.339 knots

• 1.09 times the comfortable bicycling speed (12 mph)
• 35% of the typical speed of a racehorse (37 mph)
• 19% of the typical automobile speed on a highway (70 mph)

Converting kilometers per hour to knots is a conversion between units from separate unit systems - kilometers per hour are metric (SI) defined units while knots 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

Knots are a measure of speed over long geographic distances most often associated with the maritime and aviation communities. A knot is a measurement of distance traveled in nautical miles in one hour. The origins of the knot derive from practice of mariners throwing a wooden chip log attached to a line off the stern of a ship. As the ship traveled forward, the line spooled out and the number of physical knots on the line where counted over a 30 second period to determine boat speed. The symbol for knots is either kn or kt.

## Reverse this conversion

Convert from knots to kilometers per hour instead.

## 21 kilometers per hour to other speed units

### Metric

• 21 km/h = 21 km/h

### Imperial/U.S.

• 21 km/h = 13.049 mph
• 21 km/h = 11.339 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 21 km/h to kn

km/h kn
21.01 km/h 11.344 kn
21.02 km/h 11.35 kn
21.03 km/h 11.355 kn
21.04 km/h 11.361 kn
21.05 km/h 11.366 kn
21.06 km/h 11.371 kn
21.07 km/h 11.377 kn
21.08 km/h 11.382 kn
21.09 km/h 11.388 kn
21.1 km/h 11.393 kn
21.11 km/h 11.398 kn
21.12 km/h 11.404 kn
21.13 km/h 11.409 kn
21.14 km/h 11.415 kn
21.15 km/h 11.42 kn
21.16 km/h 11.425 kn
21.17 km/h 11.431 kn
21.18 km/h 11.436 kn
21.19 km/h 11.442 kn
21.2 km/h 11.447 kn
21.21 km/h 11.452 kn
21.22 km/h 11.458 kn
21.23 km/h 11.463 kn
21.24 km/h 11.469 kn
21.25 km/h 11.474 kn
21.26 km/h 11.479 kn
21.27 km/h 11.485 kn
21.28 km/h 11.49 kn
21.29 km/h 11.496 kn
21.3 km/h 11.501 kn
21.31 km/h 11.506 kn
21.32 km/h 11.512 kn
21.33 km/h 11.517 kn
21.34 km/h 11.523 kn
21.35 km/h 11.528 kn
21.36 km/h 11.533 kn
21.37 km/h 11.539 kn
21.38 km/h 11.544 kn
21.39 km/h 11.55 kn
21.4 km/h 11.555 kn
21.41 km/h 11.56 kn
21.42 km/h 11.566 kn
21.43 km/h 11.571 kn
21.44 km/h 11.577 kn
21.45 km/h 11.582 kn
21.46 km/h 11.587 kn
21.47 km/h 11.593 kn
21.48 km/h 11.598 kn
21.49 km/h 11.604 kn
21.5 km/h 11.609 kn
km/h kn
21.51 km/h 11.614 kn
21.52 km/h 11.62 kn
21.53 km/h 11.625 kn
21.54 km/h 11.631 kn
21.55 km/h 11.636 kn
21.56 km/h 11.641 kn
21.57 km/h 11.647 kn
21.58 km/h 11.652 kn
21.59 km/h 11.658 kn
21.6 km/h 11.663 kn
21.61 km/h 11.668 kn
21.62 km/h 11.674 kn
21.63 km/h 11.679 kn
21.64 km/h 11.685 kn
21.65 km/h 11.69 kn
21.66 km/h 11.695 kn
21.67 km/h 11.701 kn
21.68 km/h 11.706 kn
21.69 km/h 11.712 kn
21.7 km/h 11.717 kn
21.71 km/h 11.722 kn
21.72 km/h 11.728 kn
21.73 km/h 11.733 kn
21.74 km/h 11.739 kn
21.75 km/h 11.744 kn
21.76 km/h 11.749 kn
21.77 km/h 11.755 kn
21.78 km/h 11.76 kn
21.79 km/h 11.766 kn
21.8 km/h 11.771 kn
21.81 km/h 11.776 kn
21.82 km/h 11.782 kn
21.83 km/h 11.787 kn
21.84 km/h 11.793 kn
21.85 km/h 11.798 kn
21.86 km/h 11.803 kn
21.87 km/h 11.809 kn
21.88 km/h 11.814 kn
21.89 km/h 11.82 kn
21.9 km/h 11.825 kn
21.91 km/h 11.83 kn
21.92 km/h 11.836 kn
21.93 km/h 11.841 kn
21.94 km/h 11.847 kn
21.95 km/h 11.852 kn
21.96 km/h 11.857 kn
21.97 km/h 11.863 kn
21.98 km/h 11.868 kn
21.99 km/h 11.874 kn