How many mph is 1 knot?

One knot displays as 1.15077944802 mph, using the exact factor 1,852/1,609.344. Thus 10 knots gives 11.5077944802 mph, 20 knots 23.0155889605 mph, 30 knots 34.5233834407 mph and 50 knots 57.5389724012 mph. In reverse, multiply mph by the exact reciprocal 1,609.344/1,852: 60 mph displays as 52.138574514 kn. Reusing rounded decimal factors only approximates these conversions.

What is the formula for knots to mph?

mph = knots × 1852 / 1609.344. A knot is one nautical mile per hour and the international nautical mile is exactly 1,852 metres, while the statute mile behind mph is exactly 1,609.344 metres, so the ratio is the exact fraction 57875/50292, or about 1.1507794480235 as a decimal. This converter carries the speed through metres per second using those defined figures rather than a rounded 1.15, which is why 10 knots comes back as 11.5077944802 rather than 11.5.

How do I convert knots to mph in my head?

Adding 15% approximates the conversion: 20 kn becomes 23 mph rather than the displayed 23.0155889605 mph, and 40 kn becomes 46 mph rather than 46.0311779209 mph. The shortcut is about 0.07% low; at 150 kn the difference is about 0.117 mph. These are shorthand calculations. Use the exact ratio for the stated quantity when that difference matters.

Why is a knot not the same as a mile per hour?

The units use different exact lengths: a knot is one international nautical mile of 1,852 m per hour, while mph uses the international statute mile of 1,609.344 m per hour. The statute mile is about 13% shorter, so the same speed has a numeric mph count about 15% higher than its knot count. Those length definitions establish the conversion without a latitude, navigation or weather assumption.

Is a knot exactly 1.852 km/h?

Yes, exactly. The nautical mile is defined as 1,852 metres and an hour is 3,600 seconds, so one knot is exactly 1.852 km/h, or approximately 0.514444444444 m/s, and the kilometres per hour column of the chart below is exact rather than rounded. Miles per hour is not so tidy: 1852 divided by 1609.344 is 57875/50292, and 50292 has 11 and 127 among its factors, so that decimal never terminates. The page rounds it at twelve significant digits.

Can I convert mph back to knots on this page?

Yes. The swap button between the two boxes reverses the pair, so the page becomes mph to knots: 100 mph is 86.8976241901 knots and 65 mph is 56.4834557235 knots. Both unit menus stay open as well, so the same number will go from knots to kilometres per hour, metres per second or feet per second without leaving the page, and Copy result copies the figure exactly as printed, without the thousands separators.

Why does the page open on knots and mph when I last converted something else?

This focused page opens on Knot and Mile per hour, while preserving the main converter’s saved unit pair. When storage is usable, a saved value and uncommon-unit preference can travel between pages. Its suffix must still match From. Valid deliberate scalar edits can save those fields after a short delay; invalid or incomplete drafts preserve the saved record. Unusable or conflicting records remain until you use Forget saved settings, which keeps the current conversion on screen. Copy result copies the displayed headline without digit-grouping commas; each visible conversion row has its own Copy button. Displayed and copied values round to twelve significant digits. If native copying fails, a complete selectable summary identifies the input, selected pair and conventions and includes every unit in the category, including uncommon units.

Is anything I type sent anywhere?

Your input and converted values are calculated in the browser and are not uploaded by the converter. The definitions arrive with the page, so conversion needs no external data lookup and keeps working offline after the page has loaded. The core conversion needs no account.

Knots to MPH

A knot is one nautical mile per hour, and a nautical mile is exactly 1,852 metres against the statute mile's 1,609.344, so knots to miles per hour is one multiplication: mph = knots × 1,852 / 1,609.344. That makes 10 knots 11.5077944802 mph, 20 knots 23.0155889605 mph and 40 knots 46.0311779209 mph. This page opens the converter on knots and miles per hour ahead of whatever pair you last used, prints the answer to twelve significant digits as you type, and lists the same speed in the other common speed units underneath, so a boat, wind or aircraft speed quoted in knots reads in every unit at once. The chart below the converter runs from 1 knot to 600 knots.

From

To1.15077944802

Category: Speed

Base unit: meter per second

A knot is one international nautical mile (1,852 meters) per hour. These are speed units, not pace in minutes per distance.

Results round to 12 significant digits using the listed unit definitions. Input must have a finite numeric magnitude and at most 512 significant digits. Type a single decimal or scientific number; a matching From unit suffix is accepted. Commas and grouped spaces separate thousands; decimal commas, fractions and compound measurements are refused.

1 kn in every speed unit

Meter per secondm/s
0.514444444444
Kilometer per hourkm/h
1.852
Mile per hourmph
1.15077944802
Foot per secondft/s
1.6878098571

Selectable complete conversion

Unit Converter — Speed
Input: 1 (Knot, kn)
Result: 1.15077944802 mph (Mile per hour)
Displayed values round to 12 significant digits.
A knot is one international nautical mile (1,852 meters) per hour. These are speed units, not pace in minutes per distance.
All other units:
Meter per second (m/s): 0.514444444444
Kilometer per hour (km/h): 1.852
Mile per hour (mph): 1.15077944802
Foot per second (ft/s): 1.6878098571

Knots to mph, km/h and m/s

Every row is calculated directly from its original knot value using the international nautical mile. Miles per hour and m/s round to two decimal places; km/h is exact here because 1 knot = 1.852 km/h.

Knots	mph	km/h	m/s
1 kn	1.15	1.852	0.51
2 kn	2.30	3.704	1.03
3 kn	3.45	5.556	1.54
5 kn	5.75	9.26	2.57
10 kn	11.51	18.52	5.14
15 kn	17.26	27.78	7.72
20 kn	23.02	37.04	10.29
25 kn	28.77	46.3	12.86
30 kn	34.52	55.56	15.43
35 kn	40.28	64.82	18.01
40 kn	46.03	74.08	20.58
45 kn	51.79	83.34	23.15
50 kn	57.54	92.6	25.72
60 kn	69.05	111.12	30.87
70 kn	80.55	129.64	36.01
80 kn	92.06	148.16	41.16
100 kn	115.08	185.2	51.44
120 kn	138.09	222.24	61.73
150 kn	172.62	277.8	77.17
200 kn	230.16	370.4	102.89
250 kn	287.69	463	128.61
300 kn	345.23	555.6	154.33
400 kn	460.31	740.8	205.78
500 kn	575.39	926	257.22
600 kn	690.47	1,111.2	308.67

Common questions

How many mph is 1 knot?: One knot displays as 1.15077944802 mph, using the exact factor 1,852/1,609.344. Thus 10 knots gives 11.5077944802 mph, 20 knots 23.0155889605 mph, 30 knots 34.5233834407 mph and 50 knots 57.5389724012 mph. In reverse, multiply mph by the exact reciprocal 1,609.344/1,852: 60 mph displays as 52.138574514 kn. Reusing rounded decimal factors only approximates these conversions.
What is the formula for knots to mph?: mph = knots × 1852 / 1609.344. A knot is one nautical mile per hour and the international nautical mile is exactly 1,852 metres, while the statute mile behind mph is exactly 1,609.344 metres, so the ratio is the exact fraction 57875/50292, or about 1.1507794480235 as a decimal. This converter carries the speed through metres per second using those defined figures rather than a rounded 1.15, which is why 10 knots comes back as 11.5077944802 rather than 11.5.
How do I convert knots to mph in my head?: Adding 15% approximates the conversion: 20 kn becomes 23 mph rather than the displayed 23.0155889605 mph, and 40 kn becomes 46 mph rather than 46.0311779209 mph. The shortcut is about 0.07% low; at 150 kn the difference is about 0.117 mph. These are shorthand calculations. Use the exact ratio for the stated quantity when that difference matters.
Why is a knot not the same as a mile per hour?: The units use different exact lengths: a knot is one international nautical mile of 1,852 m per hour, while mph uses the international statute mile of 1,609.344 m per hour. The statute mile is about 13% shorter, so the same speed has a numeric mph count about 15% higher than its knot count. Those length definitions establish the conversion without a latitude, navigation or weather assumption.
Is a knot exactly 1.852 km/h?: Yes, exactly. The nautical mile is defined as 1,852 metres and an hour is 3,600 seconds, so one knot is exactly 1.852 km/h, or approximately 0.514444444444 m/s, and the kilometres per hour column of the chart below is exact rather than rounded. Miles per hour is not so tidy: 1852 divided by 1609.344 is 57875/50292, and 50292 has 11 and 127 among its factors, so that decimal never terminates. The page rounds it at twelve significant digits.
Can I convert mph back to knots on this page?: Yes. The swap button between the two boxes reverses the pair, so the page becomes mph to knots: 100 mph is 86.8976241901 knots and 65 mph is 56.4834557235 knots. Both unit menus stay open as well, so the same number will go from knots to kilometres per hour, metres per second or feet per second without leaving the page, and Copy result copies the figure exactly as printed, without the thousands separators.
Why does the page open on knots and mph when I last converted something else?: This focused page opens on Knot and Mile per hour, while preserving the main converter’s saved unit pair. When storage is usable, a saved value and uncommon-unit preference can travel between pages. Its suffix must still match From. Valid deliberate scalar edits can save those fields after a short delay; invalid or incomplete drafts preserve the saved record. Unusable or conflicting records remain until you use Forget saved settings, which keeps the current conversion on screen. Copy result copies the displayed headline without digit-grouping commas; each visible conversion row has its own Copy button. Displayed and copied values round to twelve significant digits. If native copying fails, a complete selectable summary identifies the input, selected pair and conventions and includes every unit in the category, including uncommon units.
Is anything I type sent anywhere?: Your input and converted values are calculated in the browser and are not uploaded by the converter. The definitions arrive with the page, so conversion needs no external data lookup and keeps working offline after the page has loaded. The core conversion needs no account.

Results round to 12 significant digits using the listed unit conventions. Many factors are exact definitions; psi and parsec use rounded coefficients. Temperature includes scale offsets. Days and weeks are fixed-duration units, and unit conversion does not determine calendar dates, ambient pressure or a software label’s convention.