Miles to Kilometers
Convert distance between miles and kilometers.
1 mile = 1.609344 km (international mile).
How miles ↔ kilometers conversion works
Road distances, running races, and maps frequently switch between miles and kilometers. This page uses the international (statute) mile: 1 mile = 1.609344 kilometers. That factor is exact by definition for the international mile used in most everyday driving and fitness conversions.
The UK still uses miles on road signs and many car odometers, while continental Europe uses kilometres. Race distances (5K, 10K, half marathon) are usually metric worldwide. Convert once carefully when comparing a UK road trip estimate with a European itinerary, or when a US training plan lists miles and your watch shows km.
Formulas (both directions)
- Miles → kilometers: kilometers = miles × 1.609344
- Kilometers → miles: miles = kilometers ÷ 1.609344
- Speed (same time unit): multiply or divide by the same factor (60 mph ≈ 96.56 km/h)
Both inputs stay synchronized as you type, so you can start from a road sign, race bib distance, or GPS readout.
Worked examples: miles to kilometers
| Miles | Kilometers | Typical use |
|---|---|---|
| 1 mi | 1.609 km | Definition check |
| 3 mi | 4.828 km | Short training loop |
| 5 mi | 8.047 km | Common US training distance |
| 10 mi | 16.093 km | Longer run / drive segment |
| 26.2 mi | 42.165 km | Marathon (approximate) |
Worked examples: kilometers to miles
| Kilometers | Miles (approx.) | Typical use |
|---|---|---|
| 1 km | 0.621 mi | City block scale |
| 5 km | 3.107 mi | 5K race |
| 10 km | 6.214 mi | 10K race |
| 21.0975 km | 13.109 mi | Half marathon (standard) |
| 42.195 km | 26.219 mi | Marathon (standard) |
| 100 km | 62.137 mi | Long drive segment |
Race and commute reference
| Event / distance | Canonical figure | Other unit |
|---|---|---|
| 5K | 5.000 km | ≈ 3.107 mi |
| 10K | 10.000 km | ≈ 6.214 mi |
| Half marathon | 21.0975 km | ≈ 13.109 mi |
| Marathon | 42.195 km | ≈ 26.219 mi |
| UK “10 miles” | 10 mi | ≈ 16.093 km |
Speed conversion (same formula)
When the time unit is one hour, speed converts with the same factor as distance. Examples: 30 mph ≈ 48.28 km/h; 50 mph ≈ 80.47 km/h; 70 mph ≈ 112.65 km/h; 100 km/h ≈ 62.14 mph. UK motorways often post mph; continental European roads post km/h — convert the limit before you compare “how fast” across a border.
| mph | km/h (approx.) | km/h | mph (approx.) |
|---|---|---|---|
| 30 | 48.3 | 50 | 31.1 |
| 50 | 80.5 | 90 | 55.9 |
| 70 | 112.7 | 120 | 74.6 |
| 80 | 128.7 | 130 | 80.8 |
Nautical mile vs statute mile
A nautical mile is different (exactly 1,852 meters, about 1.852 km) and is used in aviation and marine navigation. Fitness apps, car odometers, and highway signs almost always mean the international statute mile above. If a chart says “nm,” do not use this converter.
When each unit is used
- Miles — UK road signs and many UK car odometers; US road distances and many US training plans.
- Kilometres — Continental Europe road signs; most race certifications; scientific and mapping work.
- Nautical miles — Sea and air navigation only; different factor.
Practical scenarios
Cross-border driving. A UK driver used to mph who crosses into France must think in km/h. Convert posted limits once for the trip (for example, 130 km/h ≈ 80.8 mph) rather than approximating on the fly in traffic. The same factor works for trip-distance estimates on the itinerary.
Training plans vs race distances. A US plan that says “run 6 miles” is about 9.66 km. A European 10K race is about 6.21 miles. Convert the plan into the unit your watch displays so pace alerts match the workout you intended.
Fuel and range math. If a car’s onboard computer shows remaining range in miles and your map shows the next motorway services in kilometres, convert one figure before deciding whether you need fuel. Using 1.6 as a rough factor is fine for a ballpark; use 1.609344 when you are close to empty.
How to use it
- Enter a distance in miles or kilometers.
- Read the converted value.
- Round for signs and speech (for example, “about 8 km”) when precision is not critical.
- For pace (min/mile or min/km), convert distance carefully and keep time the same — pace is not only this factor.
Common mistakes
- Using 1.6 as a mental shortcut for long trip planning, then wondering why GPS totals differ.
- Mixing nautical miles into road-trip math.
- Converting pace incorrectly — pace needs time and distance together.
- Assuming a “5K” is exactly 3.1 miles (it is ≈ 3.107 miles).
Decision checklist
- Is the chart marked nm / nautical? → Stop; use 1.852 km per nautical mile instead.
- Am I converting pace? → Convert the distance unit, keep the clock time, then restate per mile or per km.
- Am I comparing UK miles with EU km signs? → Convert the posted limit or segment once, then compare.
- Do I have yards or metres only? → Convert to miles (÷ 1760) or km (÷ 1000) first.
Frequently asked questions
How do I convert a running pace?
Convert the distance first, then keep your time the same. Example: 8:00 per mile covers 1.609344 km in those same 8 minutes — express pace as time per km after dividing appropriately, or use a dedicated pace tool.
Is a “5K” exactly 3.1 miles?
5 ÷ 1.609344 ≈ 3.107 miles, often rounded to 3.1. Race courses are measured to certified standards in metres.
Can I convert yards or meters here?
Convert yards to miles (÷ 1760) or meters to kilometers (÷ 1000) first, then use this page.
Limitations
Does not convert yards, meters alone, or nautical miles. For unit-system context, see the metric and imperial conversions guide.