Kilometers to Miles Converter
1 km = 0.621 miles (exactly 0.621371 mi). European road signs and GPS apps show kilometers; US and UK navigation shows miles. A 100 km/h speed limit equals 62.1 mph. Multiply km by 0.621371 to convert; multiply miles by 1.609344 to reverse.
Last updated: June 2026
Enter a value to see the conversion instantly.
How to convert kilometers to miles
Enter a value in the kilometers field to instantly see the equivalent in miles. The formula is: miles = kilometers × 0.621371. The reverse: kilometers = miles × 1.609344.
Distance reference: road trips, races, and running
| Kilometers | Miles | Typical use |
|---|---|---|
| 1 km | 0.6214 mi | Short walk distance |
| 5 km | 3.1069 mi | Popular running race |
| 10 km | 6.2137 mi | 10K race distance |
| 21.0975 km | 13.1094 mi | Half marathon |
| 42.195 km | 26.2188 mi | Full marathon |
| 50 km | 31.0686 mi | Long-distance cycling |
| 100 km | 62.1371 mi | One-day driving distance |
| 1000 km | 621.371 mi | Cross-country trip |
Understanding kilometers and miles
Kilometers are part of the metric system used in most countries for distance and speed limits. Miles are part of the imperial system, used primarily in the United States and the United Kingdom. The conversion factor is fixed: 1 mile equals exactly 1.609344 kilometers, which means 1 kilometer equals approximately 0.621371 miles. For the reverse direction, our miles to kilometers converter applies the same factor in the opposite sense.
When you'll need this conversion
Use this converter for: Reading US speed limits in metric units, comparing race distances across international standards, planning international trips, understanding fitness app data, converting GPS distances, comparing vehicle odometer readings when traveling between countries.
Quick mental shortcuts for kilometers to miles
For a fast estimate without a calculator, multiply kilometers by 0.6. That turns 20 km into about 12 miles and 80 km into roughly 48 miles. The true factor is 0.621371, so the 0.6 shortcut runs about 3.4% short, which is close enough for reading a road sign but not for an official race distance.
There is also a neat trick that uses the Fibonacci sequence (1, 1, 2, 3, 5, 8, 13, 21, 34), where each number is the sum of the previous two. Consecutive Fibonacci numbers approximate a kilometer-to-mile pair: 5 km is about 3 miles, 8 km is about 5 miles, 13 km is about 8 miles, and 21 km is about 13 miles. The real values (3.11, 4.97, 8.08 and 13.05 miles) are remarkably close, because the golden ratio of 1.618 sits right next to the true conversion factor of 1.609.
Common speeds in km/h and mph
Speed conversions come up whenever you are driving in a country that uses different units, checking an import car's speedometer, or following an international training plan. This table covers everyday speeds from walking pace to motorway cruising.
| Activity / limit | km/h | mph | Notes |
|---|---|---|---|
| Walking pace | 5 | 3.1 | Average adult on flat ground |
| Jogging | 10 | 6.2 | Easy recreational run |
| Cycling (leisure) | 20 | 12.4 | Flat terrain, casual pace |
| Urban speed limit (EU) | 50 | 31 | Standard city speed |
| Urban speed limit (UK) | 48 | 30 | UK in mph |
| Rural road (EU) | 90–100 | 56–62 | Varies by country |
| Motorway (EU) | 120–130 | 75–81 | Typical EU motorway limit |
| UK motorway | 113 | 70 | National speed limit |
Frequently Asked Questions
How does the 5K, 10K and marathon distance translate to miles?
5K = 3.11 miles, 10K = 6.21 miles, half marathon = 13.11 miles, full marathon = 26.22 miles. These reference points help runners and spectators follow international race events. Most race apps give both km and mile splits, but the official distance is always in kilometers.
Is a mile longer than a kilometer?
Yes. One mile is about 1.6 kilometers, so a mile is approximately 60% longer than a kilometer.
My car's odometer shows miles, so how many km have I driven?
Multiply your odometer reading by 1.609344. So if your trip shows 50 miles, you've driven 80.47 km. UK and US cars always display miles. If you're filling in a fleet form that requires km, multiply by 1.609344 and round to the nearest km.
How fast is 100 km/h in miles per hour?
100 km/h equals approximately 62.14 mph.
Can I convert running pace too?
Yes, but pace conversion is different. To convert pace (min/km to min/mile), multiply by 1.609.
What is the Fibonacci trick for converting kilometers to miles?
Consecutive numbers in the Fibonacci sequence (1, 1, 2, 3, 5, 8, 13, 21) line up closely with kilometer-to-mile pairs. So 5 km is about 3 miles, 8 km is about 5 miles, and 13 km is about 8 miles. It works because the ratio between neighboring Fibonacci numbers is about 1.618, very near the true factor of 1.609344.
How accurate is multiplying kilometers by 0.6?
Multiplying by 0.6 is a quick estimate that lands about 3.4% short of the real answer, since the exact factor is 0.621371. For 100 km the shortcut gives 60 miles versus the true 62.1 miles. It is fine for everyday distances but use the full factor for race results or anything official.