Loona Calculators
Convert kilometres per hour to miles per hour instantly — type any value and the result appears as you type. Below you will find the exact formula, a km/h to mph conversion table and a worked example.
Formula: Miles per hour = kilometres per hour × 0.621371 — the same factor as kilometres to miles, because speed is just distance over time.
Question: How many miles per hour is 100 km/h — a common motorway speed outside the US?
Steps: Take the value in kilometres per hour: 100 km/h. Apply the formula: Miles per hour = kilometres per hour × 0. That gives 100 → 62.1371 mph (rounded to four decimal places).
Result: 100 km/h = 62.1371 mph.
| Kilometres per Hour (km/h) | Miles per Hour (mph) |
| 10 km/h | 6.2137 mph |
| 20 km/h | 12.4274 mph |
| 30 km/h | 18.6411 mph |
| 50 km/h | 31.0686 mph |
| 60 km/h | 37.2823 mph |
| 80 km/h | 49.7097 mph |
| 90 km/h | 55.9234 mph |
| 100 km/h | 62.1371 mph |
| 110 km/h | 68.3508 mph |
| 120 km/h | 74.5645 mph |
| 130 km/h | 80.7782 mph |
Need a value that is not in the table — or the reverse direction? Use the converter at the top of this page or the mph to km/h converter, or the full Unit Converter for every unit in one place.
Multiply the value in kilometres per hour by 0.6214: km/h × 0.6214 = mph. For example, 10 km/h × 0.6214 = 6.2137 mph. The converter above does this instantly.
Exactly 0.6214 mph (to four decimal places). The full relationship: Miles per hour = kilometres per hour × 0.
120 km/h = 74.5645 mph — above the 70 mph motorway limit in the UK.
Use the reverse conversion — our mph to km/h converter does it instantly. For a quick check, divide by the same factor instead of multiplying.
30 mph ≈ 48 km/h (town), 60 mph ≈ 97 km/h, 70 mph ≈ 113 km/h (UK motorway), 130 km/h ≈ 81 mph (many European motorways).
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