Why are speed at sea and in aviation measured in knots?

Knots are tied to nautical miles, which are defined by Earth's longitude (1 arcminute ≈ 1,852 m). This makes navigation calculations on spherical charts straightforward — 1 knot over 1 hour covers exactly 1 nautical mile.

How do I convert m/s back to knots?

Divide the m/s value by 0.514444, or equivalently multiply by 1.94384. For example, 10 m/s ÷ 0.514444 ≈ 19.44 kn.

What is a typical cruising speed in knots and m/s?

A typical cargo ship cruises at 10–14 kn (5.1–7.2 m/s). A commercial airliner at cruise altitude travels at roughly 450–500 kn (231–257 m/s), near Mach 0.8.

Is the conversion exact?

Yes. The international nautical mile is defined as exactly 1,852 m, so 1 kn = 1852/3600 m/s = 0.5144̄ m/s (0.514444... with the digit 4 repeating). This converter uses the full precision available in 64-bit floating point.

Knots to Meters per Second Converter

Convert knots (kn) to meters per second (m/s) instantly, with a reference table for common values used in aviation and maritime navigation.

Convert Knots to m/s

Speed in knots (kn)

Speed in meters per second (m/s)

About Knots & m/s

Exact conversion factor: 1 kn = 1852 ÷ 3600 m/s ≈ 0.514444 m/s
Reverse: m/s to kn: 1 m/s = 3600 ÷ 1852 kn ≈ 1.94384 kn
Why knots?: 1 knot = 1 nautical mile per hour. A nautical mile equals 1 arcminute of latitude (1,852 m), making chart navigation arithmetic simple.
Typical speeds: Context kn m/s

Gentle breeze 7 3.60

Ferry boat 15 7.72

Cargo ship (cruise) 12 6.17

Category 1 hurricane 65 33.44

Small aircraft 120 61.73

Airliner (cruise) 480 246.93

Context	kn	m/s
Gentle breeze	7	3.60
Ferry boat	15	7.72
Cargo ship (cruise)	12	6.17
Category 1 hurricane	65	33.44
Small aircraft	120	61.73
Airliner (cruise)	480	246.93

Reference Table — Knots to m/s

Common values from 1 kn to 200 kn

Knots (kn)	Meters / second (m/s)	Knots (kn)	Meters / second (m/s)

Summary

One knot equals exactly 0.514444 meters per second, derived from the international nautical mile (1,852 m) divided by 3,600 seconds per hour. This converter applies that factor precisely, making it reliable for navigation, meteorology, and fluid-dynamics calculations. A reference table of common knot benchmarks is included for quick lookup.

How it works

Enter a speed in knots in the input field.
The converter multiplies your value by 0.514444 (the exact kn → m/s factor).
The result in meters per second appears instantly.
Use the reference table below the converter for common benchmarks.
Click "Copy" to copy the m/s result to your clipboard.

Use cases

Convert wind speed reports from knots to m/s for physics or engineering models.
Translate ship or aircraft speed from knots to SI units for scientific calculations.
Cross-check weather station data that mixes knot and m/s readings.
Convert maritime chart speeds to m/s for fluid-dynamics simulations.
Prepare data for CFD (computational fluid dynamics) software that requires m/s.
Verify manual conversions when working with nautical navigation tables.

Frequently Asked Questions

Last updated: 2026-06-15 · Reviewed by Nham Vu