UnitSnapKilometers per Hour to Miles per Hour
1 km/h = 0.6213712 mph
Kilometers per hour to miles per hour is the conversion for drivers from metric countries visiting the US or UK, and for anyone reading car specs, cycling data, or wind speeds in American terms. Most of the world posts speed limits in km/h, while the US and UK use mph.
When you need to convert kilometers per hour to miles per hour
- Understanding a metric car top speed or 0-100 km/h figure in mph
- Explaining speed limits from your home country to American or British friends
- Converting cycling or running pace data from a metric app
- Reading wind speeds in a metric forecast
How to convert kilometers per hour to miles per hour
mph = km/h × 0.6213712
Example: 5 km/h = 3.106856 mph
Common speeds
| Kilometers per Hour (km/h) | Miles per Hour (mph) |
|---|---|
| 30 km/h | 18.64114 mph |
| 50 km/h | 31.06856 mph |
| 60 km/h | 37.28227 mph |
| 80 km/h | 49.7097 mph |
| 90 km/h | 55.92341 mph |
| 100 km/h | 62.13712 mph |
| 110 km/h | 68.35083 mph |
| 120 km/h | 74.56454 mph |
| 130 km/h | 80.77825 mph |
| 200 km/h | 124.2742 mph |
Tips for converting kilometers per hour to miles per hour
- Multiply by 0.621371 for an exact result. Multiplying by 0.62 is accurate within 0.2%.
- Multiplying by 0.6 is easier but reads about 3.5% low, so add a little back at highway speeds.
- Consecutive Fibonacci numbers (5, 8, 13, 21) approximate the mile-to-kilometer ratio within about 1%, a handy memory aid.
Kilometers per Hour to Miles per Hour conversion table
| Kilometers per Hour (km/h) | Miles per Hour (mph) |
|---|---|
| 1 km/h | 0.6213712 mph |
| 2 km/h | 1.242742 mph |
| 3 km/h | 1.864114 mph |
| 4 km/h | 2.485485 mph |
| 5 km/h | 3.106856 mph |
| 6 km/h | 3.728227 mph |
| 7 km/h | 4.349598 mph |
| 8 km/h | 4.97097 mph |
| 9 km/h | 5.592341 mph |
| 10 km/h | 6.213712 mph |
| 15 km/h | 9.320568 mph |
| 20 km/h | 12.42742 mph |
| 25 km/h | 15.53428 mph |
| 30 km/h | 18.64114 mph |
| 40 km/h | 24.85485 mph |
| 50 km/h | 31.06856 mph |
| 75 km/h | 46.60284 mph |
| 100 km/h | 62.13712 mph |
| 250 km/h | 155.3428 mph |
| 500 km/h | 310.6856 mph |
| 1,000 km/h | 621.3712 mph |
About the units
Kilometers per Hour: Kilometers per hour is the unit for road speed limits and vehicle speedometers in most countries.
Miles per Hour: Miles per hour (mph) is the unit for road speed in the United States and the United Kingdom. 1 mph is exactly 0.44704 m/s.
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Frequently asked questions
How many miles per hour are in 1 kilometer per hour?
1 kilometer per hour equals 0.6213712 miles per hour.
How many kilometers per hour are in 1 mile per hour?
1 mile per hour equals 1.609344 kilometers per hour.
How do I convert kilometers per hour to miles per hour?
Use the formula mph = km/h × 0.6213712.
What is 10 kilometers per hour in miles per hour?
10 kilometers per hour equals 6.213712 miles per hour.
Related conversions
- Miles per Hour to Kilometers per Hour
- Meters per Second to Kilometers per Hour
- Kilometers per Hour to Meters per Second
- Meters per Second to Miles per Hour
- Miles per Hour to Meters per Second
- Knots to Kilometers per Hour
- Kilometers per Hour to Knots
- Knots to Miles per Hour
- Miles per Hour to Knots
- Feet per Second to Meters per Second
- Meters per Second to Feet per Second
- Mach (at 20 °C) to Kilometers per Hour
- Kilometers per Hour to Mach (at 20 °C)
- All speed units
Factors: NIST SP 811 · SI Brochure · NIST Handbook 44 — Updated