What is the difference between a statute mile and a nautical mile?

A statute mile (the common land mile) is exactly 1,609.344 meters. A nautical mile is exactly 1,852 meters — roughly 15% longer. Nautical miles are tied to Earth's geometry: one nautical mile equals one minute of arc of latitude.

How many nautical miles are in one statute mile?

One statute mile equals approximately 0.868976 nautical miles. Conversely, one nautical mile equals approximately 1.15078 statute miles.

Why do aviation and maritime navigation use nautical miles?

Nautical miles simplify navigation calculations because 1 NM corresponds to 1 arc-minute of latitude on a globe. This makes dead reckoning, chart plotting, and coordinate math much more straightforward than using statute miles.

Is this conversion accurate enough for flight planning?

Yes. The tool uses the exact internationally standardized values: 1 statute mile = 1,609.344 m, 1 nautical mile = 1,852 m. The derived conversion factor is accurate to at least 9 significant figures.

Does this tool work offline?

Yes. All calculations run entirely in your browser using JavaScript. No internet connection is needed after the page loads.

Is 30 knots the same as 30 mph?

No. A knot is one nautical mile per hour, so 30 knots equals about 34.5 mph (30 × 1.15078). Knots are based on nautical miles, which are roughly 15% longer than statute miles.

Miles to Nautical Miles Converter

Enter a distance in statute miles and get the exact equivalent in nautical miles instantly, with reverse conversion included.

Statute Miles to Nautical Miles

Distance in statute miles (mi)

Nautical Miles

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Kilometers —

Meters —

Feet —

Nautical Miles to Statute Miles

Distance in nautical miles (NM)

Statute Miles

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Kilometers —

Meters —

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Quick Reference — Statute Miles to Nautical Miles

1 mi

0.869 NM

5 mi

4.345 NM

10 mi

8.690 NM

50 mi

43.45 NM

100 mi

86.90 NM

500 mi

434.5 NM

Summary

Enter a distance in statute miles and get the exact equivalent in nautical miles instantly, with reverse conversion included.

How it works

Enter a distance value in statute miles in the input field.
The converter multiplies your value by 0.868976 to get nautical miles.
Results update instantly as you type — no button needed.
Additional related units (kilometers, feet, meters) are shown for reference.
Use the reverse converter to convert nautical miles back to statute miles.
Click Copy to copy the result to your clipboard.

Use cases

Convert road or land distances to nautical miles for maritime or flight planning.
Cross-reference weather reports or NOTAMs that mix statute and nautical miles.
Understand how a land distance compares to a nautical chart distance.
Prepare distance inputs for maritime GPS or AIS systems.
Convert aviation VFR visibility reports expressed in statute miles to nautical miles.
Help student pilots and mariners understand the difference between statute and nautical miles.
Verify unit conversions in coastal navigation coursework.
Quick lookup when reading US aviation charts that use statute miles.

Frequently Asked Questions

Last updated: 2026-09-14 · Reviewed by Nham Vu