Kilometers to Nautical Miles (km to nmi) Converter

Kilometers to Nautical Miles

Converting kilometers to nautical miles helps travellers understand flight distances, cruise routes, and aviation communications. Booking sites show km, but pilots and maritime professionals think in nautical miles.

One kilometre equals about 0.54 nautical miles (exactly 1 ÷ 1.852). Think of it as roughly half — 1,000 km ≈ 540 nmi.

When You Need This

Flight Planning

Understand distances in the aviation terms pilots actually use.

Cruise Itineraries

Convert port-to-port distances given in kilometres.

Yacht Charters

Plan sailing routes from km-based maps in nautical miles.

How to Use This Converter

Enter kilometres

Type the km value in the top field. Nautical miles appear instantly below.

Read nautical miles

The result updates live to 8 decimal places for flight-planning accuracy.

Copy or swap

Copy for logs and journals, or swap to convert nautical miles back to km.

Conversion Formula

nautical miles = km ÷ 1.852 • Quick estimate: divide km by 2 and add ~10%. Example: 1,000 km ≈ 540 nmi.

Popular Flight Distances

Route	Kilometres	Nautical miles
London – New York	5,570 km	3,007 nmi
Dubai – Singapore	5,840 km	3,153 nmi
Paris – Tokyo	9,730 km	5,254 nmi
Sydney – Los Angeles	12,050 km	6,507 nmi

Features

Instant As-You-Type Results

The result updates the moment you enter a number — no button to press, no page reload.

One-Click Swap

The swap button between the two fields reverses the direction instantly, so you can convert back without retyping.

Copy Without the Unit

Each field has its own copy button that grabs only the number, ready to paste into forms, spreadsheets, or documents.

Searchable Unit Picker

Each dropdown has a search box — switch to any other length unit and use it as a general-purpose converter.

Aviation & Maritime

Flight Context

Pilots file flight plans in nautical miles; a 5,500 km transatlantic flight is about 2,970 nmi.

Cruise Distances

A Mediterranean crossing of 500 km is 270 nmi; a transatlantic cruise of 5,500 km is about 2,970 nmi.

Travel-ready and private. Check distances at the airport or aboard — no sign-up, works offline after loading, and nothing is tracked.

Frequently Asked Questions

How many nautical miles is 1,000 km?

1,000 km equals 539.96 nautical miles — essentially 540 nmi for practical purposes.

Are "air miles" the same as nautical miles?

No. Airline loyalty "miles" are a marketing term and may not reflect actual distance. Real flight distances are measured in nautical miles or kilometres, and many programs award points by fare class, not distance.

Why do airlines show km but pilots use nautical miles?

Marketing teams use km because passengers understand metric distances. Pilots use nautical miles because aviation navigation, charts, and air-traffic control are all based on nautical miles worldwide.

How fast is a typical cruise ship?

Cruise ships typically travel 20–25 knots (37–46 km/h). At 20 knots a ship covers about 480 nmi (889 km) per day.

What's the longest flight in nautical miles?

Singapore to New York (SQ22) covers about 9,534 nmi (17,660 km), taking roughly 18–19 hours — currently the world's longest commercial flight.

Kilometers to Nautical Miles