How Fast Is a Knot in mph?

Quick answer: one knot equals 1.1508 miles per hour (and one mile per hour is 0.868976 knots). To convert any value, multiply your knots by 1.15077945.

Converting knots to miles per hour looks trivial until precision matters — then the difference between an approximation and the exact factor shows up. This reference covers the precise conversion, quick estimation tricks, worked examples and complete tables in both directions.

Understanding the units

Knot (kn)

The knot — one nautical mile per hour — is the speed unit of ships, aircraft and wind. It ties neatly to navigation because one nautical mile is one minute of latitude.

Mile per hour (mph)

Miles per hour governs road speeds in the US and UK. One mph is exactly 1.609344 km/h.

The exact conversion formula

miles per hour = knots × 1.1507794479

How to convert knots to miles per hour, step by step

Take your value in knots.
Multiply by 1.15077945 (the number of miles per hour in one knot).
Round sensibly for your context — engineering needs more decimals than a shopping list.

Worked examples:

5 knots × 1.150779 = 5.7539 miles per hour
12 knots × 1.150779 = 13.8094 miles per hour
50 knots × 1.150779 = 57.539 miles per hour
365 knots × 1.150779 = 420.0345 miles per hour

Real-world reference points

Speed anchors: a brisk walk is 5 km/h (3.1 mph), a sprinting human peaks near 45 km/h, city speed limits cluster around 50 km/h / 30 mph, highway cruise is 100–130 km/h / 60–80 mph, and a commercial jet cruises at about 900 km/h (490 knots).

Quick lookup: 1 to 100 knots in miles per hour

Scan this list for the exact value you need — each line is computed with the precise conversion factor, not an approximation.

1 knot = 1.1508 miles per hour
2 knots = 2.3016 miles per hour
3 knots = 3.4523 miles per hour
4 knots = 4.6031 miles per hour
5 knots = 5.7539 miles per hour
6 knots = 6.9047 miles per hour
7 knots = 8.0555 miles per hour
8 knots = 9.2062 miles per hour
9 knots = 10.357 miles per hour
10 knots = 11.5078 miles per hour
11 knots = 12.6586 miles per hour
12 knots = 13.8094 miles per hour
13 knots = 14.9601 miles per hour
14 knots = 16.1109 miles per hour
15 knots = 17.2617 miles per hour
16 knots = 18.4125 miles per hour
17 knots = 19.5633 miles per hour
18 knots = 20.714 miles per hour
19 knots = 21.8648 miles per hour
20 knots = 23.0156 miles per hour
21 knots = 24.1664 miles per hour
22 knots = 25.3171 miles per hour
23 knots = 26.4679 miles per hour
24 knots = 27.6187 miles per hour
25 knots = 28.7695 miles per hour
26 knots = 29.9203 miles per hour
27 knots = 31.071 miles per hour
28 knots = 32.2218 miles per hour
29 knots = 33.3726 miles per hour
30 knots = 34.5234 miles per hour
31 knots = 35.6742 miles per hour
32 knots = 36.8249 miles per hour
33 knots = 37.9757 miles per hour
34 knots = 39.1265 miles per hour
35 knots = 40.2773 miles per hour
36 knots = 41.4281 miles per hour
37 knots = 42.5788 miles per hour
38 knots = 43.7296 miles per hour
39 knots = 44.8804 miles per hour
40 knots = 46.0312 miles per hour
41 knots = 47.182 miles per hour
42 knots = 48.3327 miles per hour
43 knots = 49.4835 miles per hour
44 knots = 50.6343 miles per hour
45 knots = 51.7851 miles per hour
46 knots = 52.9359 miles per hour
47 knots = 54.0866 miles per hour
48 knots = 55.2374 miles per hour
49 knots = 56.3882 miles per hour
50 knots = 57.539 miles per hour
51 knots = 58.6898 miles per hour
52 knots = 59.8405 miles per hour
53 knots = 60.9913 miles per hour
54 knots = 62.1421 miles per hour
55 knots = 63.2929 miles per hour
56 knots = 64.4436 miles per hour
57 knots = 65.5944 miles per hour
58 knots = 66.7452 miles per hour
59 knots = 67.896 miles per hour
60 knots = 69.0468 miles per hour
61 knots = 70.1975 miles per hour
62 knots = 71.3483 miles per hour
63 knots = 72.4991 miles per hour
64 knots = 73.6499 miles per hour
65 knots = 74.8007 miles per hour
66 knots = 75.9514 miles per hour
67 knots = 77.1022 miles per hour
68 knots = 78.253 miles per hour
69 knots = 79.4038 miles per hour
70 knots = 80.5546 miles per hour
71 knots = 81.7053 miles per hour
72 knots = 82.8561 miles per hour
73 knots = 84.0069 miles per hour
74 knots = 85.1577 miles per hour
75 knots = 86.3085 miles per hour
76 knots = 87.4592 miles per hour
77 knots = 88.61 miles per hour
78 knots = 89.7608 miles per hour
79 knots = 90.9116 miles per hour
80 knots = 92.0624 miles per hour
81 knots = 93.2131 miles per hour
82 knots = 94.3639 miles per hour
83 knots = 95.5147 miles per hour
84 knots = 96.6655 miles per hour
85 knots = 97.8163 miles per hour
86 knots = 98.967 miles per hour
87 knots = 100.1178 miles per hour
88 knots = 101.2686 miles per hour
89 knots = 102.4194 miles per hour
90 knots = 103.5702 miles per hour
91 knots = 104.7209 miles per hour
92 knots = 105.8717 miles per hour
93 knots = 107.0225 miles per hour
94 knots = 108.1733 miles per hour
95 knots = 109.324 miles per hour
96 knots = 110.4748 miles per hour
97 knots = 111.6256 miles per hour
98 knots = 112.7764 miles per hour
99 knots = 113.9272 miles per hour
100 knots = 115.0779 miles per hour

Knot to Mile per hour conversion table

The extended table below covers fractional and large values for quick reference.

Knot (kn)	Mile per hour (mph)
0.01 kn	0.011508 mph
0.05 kn	0.057539 mph
0.1 kn	0.115078 mph
0.2 kn	0.230156 mph
0.25 kn	0.287695 mph
0.3 kn	0.345234 mph
0.4 kn	0.460312 mph
0.5 kn	0.57539 mph
0.75 kn	0.863085 mph
1 kn	1.1508 mph
1.25 kn	1.4385 mph
1.5 kn	1.7262 mph
1.75 kn	2.0139 mph
2 kn	2.3016 mph
2.5 kn	2.8769 mph
3 kn	3.4523 mph
3.5 kn	4.0277 mph
4 kn	4.6031 mph
4.5 kn	5.1785 mph
5 kn	5.7539 mph
6 kn	6.9047 mph
7 kn	8.0555 mph
8 kn	9.2062 mph
9 kn	10.357 mph
10 kn	11.5078 mph
11 kn	12.6586 mph
12 kn	13.8094 mph
13 kn	14.9601 mph
14 kn	16.1109 mph
15 kn	17.2617 mph
16 kn	18.4125 mph
17 kn	19.5633 mph
18 kn	20.714 mph
19 kn	21.8648 mph
20 kn	23.0156 mph
22 kn	25.3171 mph
24 kn	27.6187 mph
25 kn	28.7695 mph
26 kn	29.9203 mph
28 kn	32.2218 mph
30 kn	34.5234 mph
32 kn	36.8249 mph
35 kn	40.2773 mph
40 kn	46.0312 mph
45 kn	51.7851 mph
50 kn	57.539 mph
55 kn	63.2929 mph
60 kn	69.0468 mph
65 kn	74.8007 mph
70 kn	80.5546 mph
75 kn	86.3085 mph
80 kn	92.0624 mph
85 kn	97.8163 mph
90 kn	103.5702 mph
95 kn	109.324 mph
100 kn	115.0779 mph
110 kn	126.5857 mph
120 kn	138.0935 mph
125 kn	143.8474 mph
150 kn	172.6169 mph
175 kn	201.3864 mph
200 kn	230.1559 mph
250 kn	287.6949 mph
300 kn	345.2338 mph
350 kn	402.7728 mph
400 kn	460.3118 mph
450 kn	517.8508 mph
500 kn	575.3897 mph
600 kn	690.4677 mph
700 kn	805.5456 mph
750 kn	863.0846 mph
800 kn	920.6236 mph
900 kn	1,035.7 mph
1,000 kn	1,150.78 mph
1,500 kn	1,726.17 mph
2,000 kn	2,301.56 mph
2,500 kn	2,876.95 mph
5,000 kn	5,753.9 mph
10,000 kn	11,507.79 mph

Reverse table: miles per hour to knots

Mile per hour (mph)	Knot (kn)
0.1 mph	0.086898 kn
0.25 mph	0.217244 kn
0.5 mph	0.434488 kn
1 mph	0.868976 kn
2 mph	1.738 kn
3 mph	2.6069 kn
4 mph	3.4759 kn
5 mph	4.3449 kn
6 mph	5.2139 kn
7 mph	6.0828 kn
8 mph	6.9518 kn
9 mph	7.8208 kn
10 mph	8.6898 kn
12 mph	10.4277 kn
15 mph	13.0346 kn
20 mph	17.3795 kn
25 mph	21.7244 kn
30 mph	26.0693 kn
40 mph	34.759 kn
50 mph	43.4488 kn
60 mph	52.1386 kn
75 mph	65.1732 kn
100 mph	86.8976 kn
150 mph	130.3464 kn
200 mph	173.7952 kn
250 mph	217.2441 kn
500 mph	434.4881 kn
750 mph	651.7322 kn
1,000 mph	868.9762 kn
5,000 mph	4,344.88 kn

Reverse lookup: miles per hour in knots

1 mile per hour = 0.868976 knots
2 miles per hour = 1.738 knots
3 miles per hour = 2.6069 knots
4 miles per hour = 3.4759 knots
5 miles per hour = 4.3449 knots
6 miles per hour = 5.2139 knots
7 miles per hour = 6.0828 knots
8 miles per hour = 6.9518 knots
9 miles per hour = 7.8208 knots
10 miles per hour = 8.6898 knots
11 miles per hour = 9.5587 knots
12 miles per hour = 10.4277 knots
13 miles per hour = 11.2967 knots
14 miles per hour = 12.1657 knots
15 miles per hour = 13.0346 knots
16 miles per hour = 13.9036 knots
17 miles per hour = 14.7726 knots
18 miles per hour = 15.6416 knots
19 miles per hour = 16.5105 knots
20 miles per hour = 17.3795 knots
21 miles per hour = 18.2485 knots
22 miles per hour = 19.1175 knots
23 miles per hour = 19.9865 knots
24 miles per hour = 20.8554 knots
25 miles per hour = 21.7244 knots
26 miles per hour = 22.5934 knots
27 miles per hour = 23.4624 knots
28 miles per hour = 24.3313 knots
29 miles per hour = 25.2003 knots
30 miles per hour = 26.0693 knots

Common mistakes to avoid

Speed conversions go wrong when drivers mentally swap km/h and mph limits while traveling (a 100 km/h limit is only 62 mph), and when knots are treated as land miles per hour — a knot is based on the longer nautical mile, so 500 knots is 575 mph, not 500.

Precision and rounding

The tables above round to a few decimal places for readability. When you need full precision — engineering drawings, scientific work, legal documents — use the exact factor 1.1507794479 and round only at the very end of your calculation. Rounding intermediate steps is the most common source of conversion drift, especially when several conversions are chained together.

Convert it instantly

Skip the arithmetic entirely: our free Knot to Mile per hour converter computes any value as you type, and the Mile per hour to Knot converter handles the reverse direction. For every other speed unit, see the complete speed conversion guide.

Frequently asked questions

How many miles per hour are in one knot?

Exactly 1.1508 miles per hour. This factor comes from the internationally agreed definitions of both units.

How do I convert miles per hour back to knots?

Divide by 1.15077945 — or equivalently multiply by 0.86897624, since one mile per hour equals 0.868976 knots.

Can I do this conversion in my head?

For estimates, round the factor: one knot ≈ 1.15 miles per hour. That's usually close enough for shopping or travel; reach for the exact factor when precision matters.

What is 2.5 knots in miles per hour?

2.5 knots equal 2.8769 miles per hour. Multiply 2.5 by the factor 1.150779.

What is 500 knots in miles per hour?

500 knots equal 575.3897 miles per hour (500 × 1.150779).

Where does the conversion factor come from?

Both units are legally defined against the same SI base unit (the meter per second), so the factor 1.1507794479 is a mathematical consequence of those definitions — it is exact, permanent, and the same everywhere in the world.

How Fast Is a Knot in mph? (kn to mph Explained)