Knots to Miles Per Hour Converter (kn to mph)

How to convert knots to miles per hour

To convert knots to miles per hour, multiply the number of knots by 1.151.

Example: 20 kn = 23.016 mph.

Boats and aircraft measure speed in knots — nautical miles per hour.

Common kn to mph conversions

5 kn = 5.754 mph
10 kn = 11.508 mph
15 kn = 17.262 mph
20 kn = 23.016 mph
25 kn = 28.769 mph
30 kn = 34.523 mph
40 kn = 46.031 mph
100 kn = 115.08 mph
500 kn = 575.39 mph

Knots to Miles Per Hour conversion chart

kn	mph
0.25 kn	0.28769 mph
0.5 kn	0.57539 mph
0.75 kn	0.86308 mph
1 kn	1.151 mph
1.5 kn	1.726 mph
2 kn	2.302 mph
2.5 kn	2.877 mph
3 kn	3.452 mph
3.5 kn	4.028 mph
4 kn	4.603 mph
4.5 kn	5.179 mph
5 kn	5.754 mph
6 kn	6.905 mph
7 kn	8.055 mph
8 kn	9.206 mph
9 kn	10.357 mph
10 kn	11.508 mph
11 kn	12.659 mph
12 kn	13.809 mph
13 kn	14.96 mph
14 kn	16.111 mph
15 kn	17.262 mph
16 kn	18.412 mph
18 kn	20.714 mph
20 kn	23.016 mph
24 kn	27.619 mph
25 kn	28.769 mph
30 kn	34.523 mph
32 kn	36.825 mph
35 kn	40.277 mph
40 kn	46.031 mph
45 kn	51.785 mph
50 kn	57.539 mph
55 kn	63.293 mph
60 kn	69.047 mph
64 kn	73.65 mph
65 kn	74.801 mph
70 kn	80.555 mph
75 kn	86.308 mph
80 kn	92.062 mph
85 kn	97.816 mph
90 kn	103.57 mph
100 kn	115.08 mph
110 kn	126.59 mph
120 kn	138.09 mph
125 kn	143.85 mph
128 kn	147.3 mph
150 kn	172.62 mph
175 kn	201.39 mph
180 kn	207.14 mph
200 kn	230.16 mph
220 kn	253.17 mph
250 kn	287.69 mph
300 kn	345.23 mph
400 kn	460.31 mph
500 kn	575.39 mph
750 kn	863.08 mph
1,000 kn	1,150.8 mph

Metric vs. U.S. customary units

The United States uses U.S. customary units — inches, feet, miles, pounds, gallons and degrees Fahrenheit — for most everyday purposes. Canada officially adopted the metric system in the 1970s, so road signs, weather forecasts, gas pumps and food labels use kilometers, degrees Celsius, liters and grams. In practice many Canadians still use feet and inches for height, pounds for body weight and square feet for homes, which is why conversions come up constantly on both sides of the border.

Exact conversion factors

Since 1959 the inch, foot, yard, mile and pound have been defined in metric terms, so these conversions are exact, not approximations:

1 inch = 2.54 cm exactly, so 1 foot = 30.48 cm and 1 mile = 1.609344 km.
1 pound = 0.45359237 kg exactly; 1 ounce = 28.349523125 g.
1 U.S. gallon = 3.785411784 liters. The imperial gallon used in the U.K. is larger: 4.54609 liters.
1 acre = 4,046.8564224 m², and 1 hectare = 10,000 m² (about 2.471 acres).

Temperature is different because the scales have different zero points: °F = °C × 9/5 + 32 and °C = (°F − 32) × 5/9. Water freezes at 0 °C (32 °F) and boils at 100 °C (212 °F) at sea level, and −40 is the same in both scales.

Quick mental shortcuts

Kilometers to miles: multiply by 0.6 (100 km ≈ 60 miles; the exact figure is 62.1).
Kilograms to pounds: double it and add 10% (70 kg → 140 + 14 = 154 lb).
Celsius to Fahrenheit: double it and add 30 for a rough estimate (20 °C → 70 °F; the exact answer is 68 °F).
Liters to U.S. gallons: divide by 4 for a quick estimate (40 L ≈ 10 gallons; exactly 10.57).

Cooking and recipe conversions

U.S. recipes measure by volume — cups, tablespoons and teaspoons — while Canadian and most international recipes use milliliters and grams. A U.S. cup is about 237 mL, but Canadian "metric" measuring cups hold 250 mL, so the difference adds up in baking. For flour, sugar and butter, weighing in grams is more accurate than cups because the density of each ingredient differs.

Popular conversions

Pick a conversion below for a dedicated page with the formula, worked examples and a complete conversion chart.

Tips for accurate conversions

Keep full precision until the final step and round only the answer — rounding intermediate numbers can add noticeable errors, especially in recipes, construction and engineering. Always check which gallon, ounce or ton a source means: U.S. and imperial units share names but not sizes, and a "fluid ounce" measures volume while an "ounce" of weight measures mass. For temperatures, remember that a temperature difference converts differently from a temperature reading: a change of 10 °C equals a change of 18 °F, without adding 32.

Popular unit conversions

Frequently asked questions

How many centimeters are in an inch?

Exactly 2.54 centimeters. To convert inches to centimeters, multiply by 2.54; to convert centimeters to inches, divide by 2.54.

How do I convert kg to pounds?

Multiply kilograms by 2.20462. For example, 70 kg × 2.20462 = 154.3 lb.

What is the formula for Celsius to Fahrenheit?

Multiply by 9/5 (1.8) and add 32. For example, 25 °C × 1.8 + 32 = 77 °F.

Is a U.S. gallon the same as a Canadian gallon?

No. Canada sells gas by the liter, but when gallons are mentioned in Canada they are sometimes imperial gallons (4.546 L), which are about 20% larger than U.S. gallons (3.785 L).

How many square feet are in a square meter?

About 10.764 square feet. A 1,000 sq ft home is roughly 92.9 m².

Sources & methodology

This calculator was last reviewed on November 2, 2026. Figures are based on the following official and primary sources:

NIST – Handbook 44, Appendix C: General Tables of Units of Measurement

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