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Miles and kilometres measure distance in two different systems — the imperial mile and the metric kilometre. Converting between them comes up for road trips, running distances, car speeds and maps, especially when travelling between countries that use different units. The relationship is fixed: one mile is about 1.609 kilometres.
Enter a value and pick the direction, and the conversion is done instantly.
Miles to KM Converter: step-by-step worked example
How far is the 26.2-mile marathon distance in kilometres?
- Value
- 26.2
- Direction
- Miles → Kilometres
- 1
Conversion factor (definition)
1 mile = 1,760 yd × 0.9144 m = 1,609.344 m (exact)
1 mi = 1.609344 km = 1.6093 km
- 2
Inverse factor
1 km = 1 ÷ 1.609344 mi
1 ÷ 1.609344 = 0.6214 mi
- 3
Conversion
mi → km: × 1.609344 · km → mi: ÷ 1.609344
26.2 mi × 1.609344 = 42.1648 km
- 4
Check (reverse direction)
Convert the result back with the inverse operation
42.1648 km ÷ 1.609344 = 26.2 mi
- mi26.2
- km42.1648
- nautical mi22.7672
Good to know: Do not confuse the statute mile (1,609.344 m) with the nautical mile (1,852 m) used at sea and in aviation. Quick estimate: miles × 1.6 ≈ km.
Miles to KM Converter — how it works
The conversion
1 mile = 1.609344 km (usually rounded to 1.609). So: - Miles → km: multiply by 1.609. - km → miles: divide by 1.609 (or multiply by 0.621).
26.2 miles (a marathon) = 42.16 km; 100 km = 62.15 miles.
Where it's used
- Driving: converting distances and speed limits between countries (60 mph ≈ 97 km/h).
- Running: race distances (a 5K is 3.1 miles; a marathon is 26.2 miles).
- Maps and travel: reading distances abroad, planning fuel and time.
- Fitness trackers: switching a workout between units.
Quick mental estimate
A handy approximation: kilometres are about 0.6 of miles, and miles are about 1.6 of kilometres. So 50 miles ≈ 80 km, and 80 km ≈ 50 miles. For anything precise, use the exact 1.609 factor.
Worked example
A marathon is 26.2 miles, which is 26.2 × 1.609 = 42.16 km — the familiar 42.195 km when the full factor is used. Going the other way, a 100 km cycling route is 100 ÷ 1.609 = 62.15 miles. For a quick mental check, kilometres are roughly 0.6 of the mile figure (26.2 × 1.6 ≈ 42), which is close enough for planning but not for official distances.
Miles to kilometres table
| Miles | Kilometres |
|---|---|
| 1 | 1.61 |
| 2 | 3.22 |
| 3 | 4.83 |
| 5 | 8.05 |
| 10 | 16.09 |
| 13.1 | 21.08 |
| 20 | 32.19 |
| 26.2 | 42.16 |
| 50 | 80.47 |
| 100 | 160.93 |
| 500 | 804.67 |
Kilometres to miles table
| Kilometres | Miles |
|---|---|
| 1 | 0.62 |
| 5 | 3.11 |
| 10 | 6.21 |
| 21.1 | 13.11 |
| 42.2 | 26.22 |
| 50 | 31.07 |
| 100 | 62.14 |
| 500 | 310.69 |
| 1,000 | 621.37 |
Frequently asked questions
How many kilometres is one mile?+
About 1.609 km (precisely 1.609344). To convert miles to kilometres multiply by 1.609; to convert kilometres to miles divide by 1.609.
How do I convert km to miles?+
Divide the kilometre value by 1.609, or multiply by about 0.621. For example 100 km ÷ 1.609 = 62.15 miles.
How many km is a marathon?+
A marathon is 26.2 miles = 42.16 km (officially 42.195 km with the full conversion factor). A 5K race is 3.1 miles.
What is 60 mph in km/h?+
Speed converts with the same factor: 60 mph × 1.609 = 96.6 km/h. A 70 mph limit is about 113 km/h.
Is there a quick way to estimate the conversion?+
Yes — kilometres are roughly 0.6 of the mile value, and miles roughly 1.6 of the kilometre value. So 50 miles ≈ 80 km. For precise distances use the exact factor.
Why do the US and UK still use miles?+
Both retain the imperial mile for road distances and speed for historical reasons, while most of the world uses kilometres — which is exactly why a converter is handy when travelling.
About this page
- Publisher:
- Kalkoro — Teknolojig Bilişim Teknolojileri A.Ş., İstanbul
- Written by:
- Ahmet Tur — Editor (Math, date & time, unit conversion, physics & chemistry, everyday tools)
- Reviewed by:
- Kübra Yıldız — Editor
Parameters come from official sources; the last update date is shown at the bottom of the page.
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