UnitConvConvert
Length

Convert miles to nautical miles

1 mi=0.869nmi

Use the converter below to change any miles value into nautical miles instantly — with formula, conversion table, and real-world examples.

0.86898

Conversion formula

Forward
nautical miles = miles × 0.869
Reverse
miles = nautical miles × 1.15078

Example: 10 mi × 0.869 = 8.68976 nmi.

About both units

From

Mile

mi

The statute mile equals 1609.344 meters exactly since the 1959 international definition. It is the official road unit in the United States, United Kingdom and Myanmar. The name comes from the Latin "mille passuum" — one thousand Roman paces. The nautical mile (1852 m) is different and used only in marine and air navigation.

Real-world: London to Edinburgh is about 400 miles by road. A marathon is 26.22 miles. US highways typically post 65–75 mph speed limits.
Read full mile reference →
To

Nautical Mile

nmi

The nautical mile equals 1852 meters exactly — defined as one minute of arc along a meridian. It is the standard distance unit for marine and air navigation worldwide. Ship and aircraft speeds are given in knots, where 1 knot = 1 nautical mile per hour.

Real-world: Territorial waters extend 12 nautical miles from the coastline. London Heathrow to New York JFK is about 3000 nmi.
Read full nautical mile reference →

Mile to Nautical Mile conversion table

Common miles to nautical miles values for quick reference.

Mile (mi)Nautical Mile (nmi)
1 mi0.869 nmi
5 mi4.34488 nmi
10 mi8.68976 nmi
25 mi21.7244 nmi
50 mi43.4488 nmi
100 mi86.8976 nmi
250 mi217.244 nmi
500 mi434.488 nmi
1,000 mi868.976 nmi
5,000 mi4,344.88 nmi

Tips & common mistakes

Quick tips

  • 1 mile ≈ 1.6 km. Mental trick: add 60% to the mile figure.
  • A running mile in 4 minutes is an elite pace; a recreational runner covers it in 8–10 minutes.
  • US cars show mph only. Check the speedometer scale before assuming the units.

Avoid these

  • Confusing statute miles (1.609 km) with nautical miles (1.852 km) — a 15% gap.
  • Reading a US speedometer as km/h — 70 mph is 112 km/h, not 70.
  • Using 1.5 or 1.6 for quick conversions when precision matters — use 1.609 for engineering or legal documents.

Frequently asked questions

How many nautical miles in a mile?
One mile equals 0.869 nautical miles.
How do I convert miles to nautical miles?
Multiply the mile value by 0.869 to get the equivalent in nautical miles.
What is 100 miles in nautical miles?
100 miles equals 86.8976 nautical miles.
Is a mile bigger than a nautical mile?
No. 1 mile equals 0.869 nautical miles, so one mile is smaller.
How to convert miles to nautical miles without a calculator?
Multiply by 0.87 for a quick estimate; use a calculator for precise results.

Related length conversions

📊 See full comparison matrix →

More from Mile

mi → m
1 = 1,609.34 m
mi → km
1 = 1.60934 km
mi → cm
1 = 160,934.4 cm
mi → mm
1 = 1,609,344 mm
mi → yd
1 = 1,760 yd
mi → ft
1 = 5,280 ft
mi → in
1 = 63,360 in
mi → µm
1 = 1,609,344,000 µm

More to Nautical Mile

m → nmi
1 = 0.00054 nmi
km → nmi
1 = 0.54 nmi
cm → nmi
1 = 5.3996e-6 nmi
mm → nmi
1 = 5.3996e-7 nmi
yd → nmi
1 = 0.0004937 nmi
ft → nmi
1 = 0.0001646 nmi
in → nmi
1 = 1.3715e-5 nmi
µm → nmi
1 = 5.3996e-10 nmi

Conversions in other categories

WeightKilogram → PoundTemperatureCelsius → FahrenheitVolumeLiter → US GallonAreaSquare Meter → Square FootSpeedKilometer per Hour → Mile per HourEnergyKilojoule → KilocaloriePressureBar → Pound per Square InchPowerKilowatt → Mechanical Horsepower