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Miles to KM

Converters

Convert miles to kilometers and kilometers to miles with precision 1.609 factor for travel, driving, and fitness contexts.. Free, private — all processing in your browser.

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The Miles to Km Converter translates between miles (statute and nautical) and kilometers. 1 mile = 1.609 km exactly. Used for road distance, running, flying, shipping, and any context where metric and imperial distance systems meet.

Enter miles or km and see conversion instantly. Also shows nautical miles for maritime/aviation, yards/meters for shorter distances, and speed unit conversion (mph to kph).

Miles to KM — key features

Miles and km instant

Enter either, see the other.

Nautical mile included

For aviation and marine contexts.

Speed conversion

mph to kph and vice versa.

Common distance presets

Marathon, 5K, road trip distances.

Fuel economy

mpg to L/100km for international car specs.

Smaller units

Yards, meters, feet for detailed distance.

Copy results

One-click copy any unit.

Client-side only

All conversion in your browser.

How to use the Miles to KM

  1. 1

    Enter value

    Miles or km field.

  2. 2

    See conversion

    All related units update.

  3. 3

    Optional — speed

    Convert mph to kph for driving speeds.

  4. 4

    Optional — fuel

    mpg to L/100km for car specs.

  5. 5

    Copy result

    One-click copy.

Common use cases for the Miles to KM

Travel

  • →Road trip planning: Convert distance between countries with different systems.
  • →Flight distance: Aviation uses nautical miles; translate for ground distance.
  • →GPS distances: Convert GPS-reported distances to preferred unit.

Fitness

  • →Running distance: Convert between 5K/10K/marathon distances and miles.
  • →Cycling distance: European cyclists use km, US often miles.
  • →Treadmill: Set treadmill pace in familiar unit regardless of display.

Automotive

  • →Driving speed: Convert speed limits across borders.
  • →Fuel economy: Compare US (mpg) and European (L/100km) ratings.
  • →Odometer reading: Convert between mile and km odometer displays.

Miles to KM — examples

Road trip

Long distance.

Input
500 miles
Output
805 km, 435 nautical miles

Marathon

Running distance.

Input
26.2 miles
Output
42.2 km (official marathon distance)

Short walk

Small distance.

Input
2.5 miles
Output
4.0 km, 4022 meters

Highway speed

Speed limit.

Input
70 mph
Output
113 km/h

International flight

Using nautical.

Input
3000 nautical miles
Output
5556 km, 3452 statute miles

Technical details

Mile definitions:

Statute mile (land mile): 1 mile = 1.609344 km exactly. Used for road distance in US, UK.

Nautical mile: 1 nautical mile = 1.852 km. Based on 1 minute of latitude. Used in aviation and maritime contexts.

UK mile: same as statute mile (they\u2019re aligned).

Conversion factors:
1 mile = 1.609344 km
1 km = 0.621371 miles
1 nautical mile = 1.852 km = 1.151 statute miles

Speed:
1 mph = 1.609 km/h
1 km/h = 0.621 mph

Common distances:
- 1 km = 0.62 mi
- 5 km (5K run) = 3.1 mi
- 10 km (10K run) = 6.2 mi
- 21.0975 km (half marathon) = 13.1 mi
- 42.195 km (marathon) = 26.2 mi
- 100 km = 62.1 mi
- 100 mi = 161 km
- 1000 mi = 1609 km

Driving speeds:
- 30 mph = 48 km/h
- 55 mph = 89 km/h
- 70 mph = 113 km/h (US interstate)
- 100 km/h = 62 mph (Canada, Europe)
- 130 km/h = 81 mph (German autobahn)

Fuel economy:
- 25 mpg US = 9.4 L/100km
- 35 mpg US = 6.7 L/100km
- 50 mpg = 4.7 L/100km

Precision:
- Floating-point handles all practical distances
- Very long distances (10,000+ km) still exact
- Sub-meter precision achievable

Common problems and solutions

⚠Statute vs nautical

Statute mile (1.609 km) for land; nautical mile (1.852 km) for aviation/marine. Don’t confuse.

⚠UK uses miles on roads

UK road signs still use miles and mph despite metric elsewhere. Road distances in UK almost always miles.

⚠Rounding 1.609

1.6 kph per mph is rough; exact is 1.609. For precise work (engineering, GPS), use 1.609; for casual, 1.6 is fine.

⚠Time × speed

Multiply speed × time for distance. Make sure units match. 60 mph × 2 hours = 120 mi, not 120 km.

⚠Fuel units reversed

US mpg (higher is better) vs L/100km (lower is better) express different things. Higher mpg = lower L/100km.

⚠Metric creeping in US

Running events in US often use km (5K, 10K) even though other distances are miles. Don’t assume one unit across a whole domain.

⚠Scientific vs casual

For navigation/aviation: exact 1.852 km per nautical mile. For casual: ~1.85 km works.

Miles to KM — comparisons and alternatives

Compared to manual math, this tool shows all units at once. Manual 1.6 or 1.6 multiplication works but is rough.

Compared to Google search (\\\"100 miles in km\\\"), this tool shows more units and allows bidirectional entry.

Compared to GPS devices, this tool converts any value without needing a device.

Frequently asked questions about the Miles to KM

▶How many km is 1 mile?

1 mile = 1.609 km (exact 1.609344).

▶How many miles is 1 km?

1 km = 0.621 miles.

▶What is a nautical mile?

1 nautical mile = 1.852 km or 1.151 statute miles. Based on minute of latitude on Earth’s surface. Used in aviation and maritime.

▶How long is a marathon in miles?

26.2 miles (42.195 km).

▶How fast is 100 km/h in mph?

About 62 mph.

▶Is my data private?

Yes. All conversion runs in your browser.

▶Why different fuel economy systems?

US uses mpg (how far you go per unit fuel); Europe uses L/100km (how much fuel for fixed distance). Opposite metrics but both measure efficiency. US mpg: higher is better; Euro L/100km: lower is better.

▶What about kilometers per liter?

Used in some countries (Japan, India). Convert via mpg: km/L × 2.352 = mpg (approximately).

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