How many mph is one knot?

One knot is exactly 1.150779 miles per hour. The simple rule of thumb is that a knot is about 15 percent faster than a mile per hour, so 20 knots is roughly 23 mph.

Why is a nautical mile different from a statute mile?

A nautical mile is 1852 metres, defined to equal one minute of latitude, which makes chart work convenient. A statute land mile is 1609.344 metres. Because a knot is one nautical mile per hour, it is faster than a mile per hour.

How do I convert knots to km/h quickly?

Multiply knots by 1.852 to get km/h, since one nautical mile is 1.852 kilometres. So 30 knots is about 55.6 km/h. To go back, divide km/h by 1.852.

What is the exact factor for knots to m/s?

One knot equals 1852 divided by 3600 metres per second, which is 0.514444 m/s. This tool converts every input to metres per second first and then out to each unit, so all results are mutually consistent.

Is this useful for wind speed?

Yes. Meteorologists often report wind in m/s or km/h while mariners and aviators use knots. Converting here lets you cross-check a forecast and look the value up on the Beaufort scale if needed.

Knots / MPH / km/h / m/s Speed Converter

Knots, miles per hour, kilometres per hour, feet per second, and metres per second all measure the same thing in different worlds — the sea, the road, the lab, and the sky. This converter moves a single speed between all five units at once, using exact factors so the numbers always reconcile.

How it works

Every conversion is anchored to the SI metre per second. The input is converted to m/s once, then back out to each unit:

1 knot  = 1852 / 3600 m/s = 0.514444 m/s   (1 nautical mile = 1852 m)
1 mph   = 1609.344 / 3600 m/s = 0.44704 m/s
1 km/h  = 1000 / 3600 m/s = 0.277778 m/s
1 ft/s  = 0.3048 m/s

Because the conversions share a single base unit, the round trip is lossless: convert 10 knots to km/h and back and you recover exactly 10 knots.

Example and tips

A 25-knot wind is about 28.8 mph, 46.3 km/h, 42.2 ft/s, or 12.9 m/s. For mental maths, remember the chain 1 knot ≈ 1.15 mph ≈ 1.85 km/h. A racing yacht doing 18 knots is moving at roughly 33 km/h, while a 60 mph car is about 52 knots — handy when comparing a road speed to a vessel or aircraft figure.