⚖️ Comparison · Updated for 2026

Knots vs MPH

Side-by-side comparison, when-to-use-each guide, and instant conversion. Reviewed for 2026.

Quick answer: 1 knot = 1.151 mph = 1.852 kph. Knots are still standard in shipping, aviation and meteorology — because 1 nautical mile = 1 minute of latitude, making navigation maths much cleaner on a globe than statute miles would be.

Use Knots when…

Shipping (universal), aviation (universal for airspeed), meteorology (wind speeds), sailing.

Use MPH when…

Road traffic in UK/US, athletic running speeds, vehicle speedometers.

Aspect	Knots	MPH
Definition	1 nautical mile per hour	1 statute mile per hour
1 nautical mile	1,852 m	—
Origin	Old ship's log with knotted rope	Statute mile of 1593
Used in	Sea, air, weather	Land transport (UK/US)

Frequently asked

Why do ships use knots?

A nautical mile equals one arc-minute of latitude, so navigation with charts is far simpler. A ship at 1 knot covers 1 arc-minute of latitude per hour — the maths almost does itself.

How fast is a 747 in knots vs mph?

Cruising speed is about 490 knots = 564 mph = 908 kph. Pilots think in knots; passengers usually see speed in mph or kph on the inflight map.

Reviewed for 2026. All conversion factors and historical references verified against official sources (ISO standards, government weights & measures legislation, IEC technical specifications). Built by a UK-based qualified primary teacher and FA Level 2 coach as part of 247QuickTools' free utility-tools project. We don't sell SEO links or accept paid placements in this content.

Frequently asked questions

Why do ships use knots?

A nautical mile equals one arc-minute of latitude, so navigation with charts is far simpler. A ship at 1 knot covers 1 arc-minute of latitude per hour — the maths almost does itself.

How fast is a 747 in knots vs mph?

Cruising speed is about 490 knots = 564 mph = 908 kph. Pilots think in knots; passengers usually see speed in mph or kph on the inflight map.