200 kn to mph — 200 knots in miles per hour
Exact 200 × 1.150779 = 230.15589
200 knots in other units
| Metres per second | 102.888889 | m/s |
|---|---|---|
| Kilometres per hour | 370.4 | km/h |
| Miles per hour | 230.15589 | mph |
| Feet per second | 337.561971 | ft/s |
kn to mph at a glance
| Knots | Miles per hour |
|---|---|
| 1 kn | 1.150779 mph |
| 2 kn | 2.301559 mph |
| 3 kn | 3.452338 mph |
| 5 kn | 5.753897 mph |
| 10 kn | 11.507794 mph |
| 20 kn | 23.015589 mph |
| 25 kn | 28.769486 mph |
| 50 kn | 57.538972 mph |
| 100 kn | 115.077945 mph |
| 250 kn | 287.694862 mph |
| 500 kn | 575.389724 mph |
| 1,000 kn | 1,150.78 mph |
How to convert knots to miles per hour
Multiply by 1.150779 — one knot is 1.150779 miles per hour. That factor is exact: it comes from the definition of the units rather than from a measurement, so it will not change and does not need rounding.
Working 200 × 1.150779 = 230.15589
In words: about two hundred thirty miles per hour.
What these units are
The knot and the mile per hour are covered in the speed unit guide, along with every other unit on this page.
Questions
How many miles per hour are in a knot?
One knot is 1.150779 miles per hour. This figure is exact — it comes from the definition of the unit, not a measurement.
What is 200 knots in miles per hour?
200 knots is 230.15589 miles per hour. The working is 200 × 1.150779 = 230.15589.
What is a knot?
One nautical mile per hour — and a nautical mile is one minute of latitude, fixed at exactly 1,852 metres. That is the whole point of it: a ship making 10 knots for six hours has covered one degree of latitude, which you can read straight off a chart without converting anything.
Why do sailors and pilots say "knots" and not "knots per hour"?
Because the "per hour" is already inside the word. A knot is a speed, not a distance, so "knots per hour" would be an acceleration. The name comes from the knotted rope once paid out behind a ship and counted against a sand glass.
What's the quick way to convert mph to km/h in my head?
Multiply by 1.6, or add 60%. For the other direction, take away a third and then a little more. Fifty mph is 80 km/h, 60 is 97, 70 is 113 — worth remembering if you drive across a border where the signs change.
Why isn't Mach on this page?
Because it is not a fixed unit. Mach 1 is the local speed of sound, which falls as air gets colder — around 1,235 km/h at sea level but closer to 1,062 km/h in the stratosphere where airliners cruise. A single conversion factor would be wrong nearly everywhere.