How do you convert miles to nautical miles?

To convert miles (mi) to nautical miles (nmi), multiply the length in miles by 0.86898 (nautical miles = miles × 0.86898).

What is 100 miles in nautical miles?

100 miles (100 mi) is equal to 86.89762 nautical miles (86.89762 nmi).

Which is larger, 1 mile (statute) (mi) or 1 nautical mile (nmi)?

One nautical mile (nmi) is larger than one mile (statute) (mi). Specifically, 1 nmi equals 1.15078 mi, while 1 mi is 0.86898 nmi.

How do I convert back from nautical miles (nmi) to miles (mi)?

To reverse the calculation from nmi to mi, multiply your nautical mile value by the inverse factor 1.15078 (or divide by 0.86898). You can also click the Swap button in the tool above to flip directions in one click.

How many decimal places should I round mi to nmi results to?

For everyday comparisons and quick estimates, rounding to 2 decimal places is usually sufficient (for example, 100 mi ≈ 86.90 nmi). For engineering, laboratory, or machining specifications, select 4 or 6 decimals—or Scientific (10ⁿ) mode—in the calculator toolbar above.

Miles to Nautical Miles Converter

Enter the length in miles below to convert it to nautical miles.

Nautical Miles to Miles (nmi → mi)

Convert Miles to Nautical Miles

Enter a value in miles (mi) to convert to nautical miles (nmi).

Value (mi)

From

Result

•

86.89762419nautical miles

100 mi = 86.89762419 nmi

Result updates automatically

Get Widget

Equivalent Measurements Across UnitsFor 100 mi

Millimeters160,934,400 mm

Centimeters16,093,440 cm

Meters160,934.4 m

Inches6,336,000 in

Feet528,000 ft

Yards176,000 yd

Suggested Conversions

Reference:NIST OWM (SI Units — Length)

[1–3] ↓

Miles to Nautical Miles Conversion Chart (1–40 Continuous)

Continuous 1 to 40 miles lookup table with exact decimals and reduced nearest 1/64 fractions. Highlighted rows mark common shop and ruler values.

Common values highlighted · Round-half-up & reduced to lowest terms

Miles (mi)	Decimal (nmi)	Fraction — Nearest 1/64 (Reduced)	Nearest 1/16 (Tape)
1 mi★ Common	0.868976 nmi	7/8 nmi	7/8 nmi
2 mi★ Common	1.737952 nmi	1 47/64 nmi	1 3/4 nmi
3 mi★ Common	2.606929 nmi	2 39/64 nmi	2 5/8 nmi
4 mi	3.475905 nmi	3 15/32 nmi	3 1/2 nmi
5 mi★ Common	4.344881 nmi	4 11/32 nmi	4 3/8 nmi
6 mi★ Common	5.213857 nmi	5 7/32 nmi	5 3/16 nmi
7 mi	6.082834 nmi	6 5/64 nmi	6 1/16 nmi
8 mi★ Common	6.95181 nmi	6 61/64 nmi	6 15/16 nmi
9 mi	7.820786 nmi	7 53/64 nmi	7 13/16 nmi
10 mi★ Common	8.689762 nmi	8 11/16 nmi	8 11/16 nmi
11 mi	9.558739 nmi	9 9/16 nmi	9 9/16 nmi
12 mi★ Common	10.427715 nmi	10 27/64 nmi	10 7/16 nmi

UnitConvertersGo · https://unitconvertersgo.com/length/miles-to-nautical-miles

How to Convert Miles to Nautical Miles

To convert miles to nautical miles, multiply the length by the following conversion ratio: 0.8689762 nautical miles/mile.

Since one mile is equal to 0.8689762 nautical miles, you can use this simple formula to convert:

nautical miles = miles × 0.8689762

The length in nautical miles is equal to the length in miles multiplied by 0.8689762.

For example, here's how to convert 100 miles to nautical miles using the formula above.

nautical miles = (100 mi × 0.8689762) = 86.8976242 nmi

How Many Nautical Miles Are in a Mile?

There are 0.8689762 nautical miles in a mile, which is why we use this value in the formula above.

1 mi = 0.8689762 nmi|1 nmi = 1.1507794 mi

Our mile fraction and decimal calculator can convert miles and nautical miles, and it automatically converts the results to US customary, imperial, and SI metric values.

Miles and nautical miles are both units used to measure length. Keep reading to learn more about each unit.

What Is a Mile?

A mile is a unit of length equal to 1,609.344 meters (m), the base unit for length. Statute mile equal to 5,280 feet or 1,760 yards (1.609344 km). [1]

The mile is classified as a US customary and imperial unit of length. Miles can be abbreviated as mi; for example, 1 mile can be written as 1 mi.

One statute mile is defined as 5,280 feet or 1,760 yards, which equals exactly 1,609.344 meters (1.609344 kilometers).

In practice, miles (mi) are widely used across large-scale industrial, bulk, and macro-level length specifications within US customary and imperial workflows, engineering documentation, and technical data sheets.

Learn more about miles in our Length Converter.

What Is a Nautical Mile?

A nautical mile is a unit of length equal to 1,852 meters (m), the base unit for length. Maritime and aviation unit defined as exactly 1,852 meters. [2]

The nautical mile is classified as a standard unit of length. Nautical Miles can be abbreviated as nmi; for example, 1 nautical mile can be written as 1 nmi.

When working with nautical miles (nmi) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.

In practice, nautical miles (nmi) are widely used across large-scale industrial, bulk, and macro-level length specifications within international standard workflows, engineering documentation, and technical data sheets.

Learn more about nautical miles in our Length Converter.

When converting length between miles (mi) and nautical miles (nmi), keep full floating-point precision (1 mi = 0.8689762 nmi; 1 nmi = 1.1507794 mi) during intermediate calculations and round only the final nautical mile figure to match your instrument tolerance.

More Mile & Nautical Mile Conversions

Need to calculate in the opposite direction? Use our nautical miles to miles converter (nmi to mi) to switch your starting unit immediately. You can also explore related tools such as converting miles to kilometers, converting miles to feet, or converting centimeters to inches.

Convert from Miles

Convert to Nautical Miles

Frequently Asked Questions

There are 0.86898 nautical miles (nmi) in 1 mile (mi). Conversely, 1 nautical mile (nmi) is equal to 1.15078 miles (mi).

Length Converter

Quick Info

Direct Factor: 1 mile (statute) (mi) equals 0.86898 nautical miles (nmi).
Inverse Factor: 1 nautical mile (nmi) equals 1.15078 miles (mi).
Formula: nautical miles = miles × 0.86898.
Verified Precision: Anchored to official NIST SP 811 and ISO/IEC 80000 standards.

Units Comparison

Mile (Statute) (mi)

Statute mile equal to 5,280 feet or 1,760 yards (1.609344 km).

Nautical Mile (nmi)

Maritime and aviation unit defined as exactly 1,852 meters.

Meter (m)

The fundamental SI unit of length, defined by the speed of light in vacuum.

References

[1]NIST OWM · SI Units — Length
Source
[2]BIPM · SI Base Unit: Metre (m)
Source
[3]NIST HB 133 · NIST Handbook 133 (2019 Ed.)
Source

Related Categories

Add This Calculator to Your Site

Free HTML widget · 4 embed formats

Embed the interactive Miles to Nautical Miles converter on your blog, classroom, or documentation page.

Customize & Get Embed Code

References

NIST · BIPM · ISO

[1]
NIST OWM (SI Units — Length)·Length Metrology Standard — Miles (mi) to Nautical Miles (nmi)
NIST OWM Standard
[2]
BIPM (SI Base Unit: Metre (m))·Unit Specifications: Mile (Statute) (mi) & Nautical Mile (nmi)
BIPM Specification
[3]
NIST HB 133 (NIST Handbook 133 (2019 Ed.))·Conversion Factors & Mathematical Basis (mi to nmi)
NIST HB 133 Reference

Measurement Navigator78 Categories9 Scientific Domains

Browse All 78 Measurement Categories

A–Z Directory →Sitemap

Common ConvertersEveryday metric, imperial, and US customary converters for length, weight, volume, temperature, area, pressure, energy, speed, time, and data.