A pilot announces "winds at 30 knots" and American passengers wonder what that means in the mph they know from their car. The answer is 1.15078 — multiply knots by it to get miles per hour. Thirty knots is about 34.5 mph, a stiff breeze. A 500-knot jetliner cruises near 575 mph. The knot-to-mph conversion is the one that makes aviation weather, sailing forecasts, and hurricane reports legible to anyone who grew up with highway speed limits.

Type your speed in the Knots (kn) box and the Miles per Hour (mph) readout multiplies by 1.15078, with a bonus km/h column at 1.852 each. The 20-knot example gives about 23.02 mph — small-craft-advisory territory on the water. The 30-knot example gives 34.52 mph, the kind of wind that rattles patio furniture. The factor comes from the nautical mile being about 15 percent longer than the statute mile (1,852 meters versus 1,609.344), which is why knots always read a bit faster than the "same" number in mph. Boaters checking NOAA marine forecasts, student pilots decoding METAR wind reports, and coastal residents tracking hurricane advisories all do this multiplication. Memorize 1.15: 20 knots ≈ 23 mph, close enough for any dockside conversation.

With the pre-filled defaults — Knots (kn) 20 — the Knot to mph returns Miles per Hour (mph) 23.0156, km/h 37.0400. Change any input and those results update instantly, so you can see exactly how each number you enter moves the answer.