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A knot is a rate of speed used to determine how many nautical miles per hour something is travelling. This measurement is usually used to measure distances over the sea, and so it is helpful to convert knots to miles per hour, since this is a land rate most people better understand. The simplest way to convert knots to miles per hour is by multiplying the number of knots by 1.151.
Steps
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Understand the relationship between a statute mile and a nautical mile. A statute mile is what is typically used to measure long distances over land. A statute mile is equal to 5,280 feet. [1] X Research source A nautical mile is usually used to measure distances that are across open water or space. A nautical mile is equal to 6,076 feet.
- Knots are determined by how many nautical miles are being travelled per hour. 1 knot = 1 nautical mile per hour. [2] X Research source
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Multiply the knots by 6,076. This converts the rate in knots to feet per hour, since there are 6,076 feet in a nautical mile. [3] X Research source
- For example, if a boat is travelling at 17 knots, to find how many feet per hour, calculate .
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Divide the feet per hour rate by 5,280. Since there are 5,280 feet in a statute mile, to know how many miles per hour something is traveling, divide the number of feet per hour by 5,280. [4] X Research source
- For example, if a boat is travelling 103,292 feet per hour, to find out how many miles per hour it is travelling, you would calculate
So, a boat travelling at 17 knots is travelling about 19.56 miles per hour.
- For example, if a boat is travelling 103,292 feet per hour, to find out how many miles per hour it is travelling, you would calculate
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Understand the relationship between knots and miles per hour. Both are rates of speed. Something travelling at 1 knot is equal to travelling 1.151 miles per hour. [5] X Research source
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Set up the conversion formula. Since 1 knot = 1.151 miles per hour, the formula is , where equals the rate in knots, and equals the rate in miles per hour. [6] X Research source
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Plug the number of knots into the formula. Make sure you are substituting for the value. Multiply to find the number of miles per hour. [7] X Research source
- For example, if the wind is blowing at 20 knots, you would calculate as follows:
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So, if the wind blows at 20 knots, it is going about 23 miles per hour.
- For example, if the wind is blowing at 20 knots, you would calculate as follows:
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Multiply the miles per hour by 5,280, then divide by 6,076. This converts the rate to feet per hour, since there are 5,280 feet in a statute mile. Dividing by 6,076, the number of feet in a nautical mile, tells you how many knots something is travelling.
- For example, a boat might be travelling 20 mph.
- Converting to feet per hour: .
- Converting to knots: .
- So, a boat travelling 20 mph is travelling at about 17 knots.
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Multiply the miles per hour by 0.869. This is the conversion rate, since there are about 0.869 knots per mile. The product will tell you the rate in knots. [8] X Research source
- For example, the wind might be blowing at 25 miles per hour.
- Simply multiply, or use the formula , where equals the rate in miles per hour, and equals the rate in knots.
- So, wind blowing at 25 mph is blowing at about 22 knots.
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Try this sample problem. A red boat is travelling at 15 knots. A blue boat is travelling at 17 miles per hour. Which boat is travelling faster?
- To convert how fast the blue boat is travelling in mph to knots, multiply by the number of miles per hour by 0.869:
- The red boat is travelling at 15 knots; the blue boat is travelling a little less than 15 knots. So the red boat is travelling faster.
- To convert how fast the blue boat is travelling in mph to knots, multiply by the number of miles per hour by 0.869:
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References
- ↑ http://indianapublicmedia.org/amomentofscience/difference-mile-nautical-mile/
- ↑ https://www.grc.nasa.gov/www/k-12/WindTunnel/Activities/knots_vs_mph.html
- ↑ https://www.grc.nasa.gov/www/k-12/WindTunnel/Activities/knots_vs_mph.html
- ↑ https://www.grc.nasa.gov/www/k-12/WindTunnel/Activities/knots_vs_mph.html
- ↑ https://oceanservice.noaa.gov/facts/nautical-mile-knot.html
- ↑ https://www.omnicalculator.com/conversion/knots-to-mph
- ↑ https://www.omnicalculator.com/conversion/knots-to-mph
- ↑ https://www.advancedconverter.com/unit-conversions/speed-conversion/miles-per-hour-to-knot
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Knots are used to measure the rate of speed on the water. The simplest way to convert knots to miles per hour is to multiply the number of knots by 1.151. For example, if you're trying to convert 17 knots to miles per hour, you would multiply 17 by 1.151 and get 19.6. Therefore, 17 knots is equal to 19.6 miles per hour. To learn how to convert knots to feet per mile, read on!
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