Instant Unit Conversion
Convert MPH to KM/H (mph to km/h)
Exact formula, conversion factors, live calculator, and reference charts for mph to km/h.
Method reviewed:Exact defined factors — international yard and pound (1959), US customary gallon and cup, SI — the values NIST SP 811 lists · reviewed September 2026
1 mile per hour is equal to exactly 1.609344 kilometres per hour. To convert mph to km/h, multiply by 1.609344.
Live MPH to KM/H Calculator
km/h = mph × 1.609344Open full speed converter →MPH to KM/H Conversion Table
Quick reference conversion chart from 1 to 100 mph.
| MPH (mph) | KM/H (km/h) | Mathematical Formula |
|---|---|---|
| 1 mph | 1.6093 km/h | 1 × 1.60934 |
| 2 mph | 3.2187 km/h | 2 × 1.60934 |
| 5 mph | 8.0467 km/h | 5 × 1.60934 |
| 10 mph | 16.0934 km/h | 10 × 1.60934 |
| 15 mph | 24.1402 km/h | 15 × 1.60934 |
| 20 mph | 32.1869 km/h | 20 × 1.60934 |
| 25 mph | 40.2336 km/h | 25 × 1.60934 |
| 50 mph | 80.4672 km/h | 50 × 1.60934 |
| 75 mph | 120.7008 km/h | 75 × 1.60934 |
| 100 mph | 160.9344 km/h | 100 × 1.60934 |
Frequently Asked Questions
What is 70 mph in km/h?
70 mph is 112.7 km/h — the UK motorway limit, next to the 110 or 120 km/h used across much of Europe.
What is a quick way to estimate mph in km/h?
Add half again, then a bit: 60 mph → 60 + 30 = 90, plus about 6 gives 96. The exact answer is 96.6 km/h.
Which countries still post speeds in mph?
Chiefly the United States and the United Kingdom, along with a handful of others. Most of the world posts km/h.