⚖️ 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. This comparison is general guidance based on publicly available information. Prices, rates, rules and specifications change, so check current details with the provider or an official source before making a decision. 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.