How to convert it
- Multiply by 1.609344: 42 × 1.60934 = 67.5924 km/h.
- Result: 42 mph ≈ 67.59 km/h.
km/h = mph x 1.609344
That is 18.78 m/s or 36.5 knots.
UK and US road signs use mph; most other countries post limits in km/h.
Speed
42 mph to km/h
Quick answer, the exact math, and nearby values. Need a different number? Use the mph to km/h Converter.
Nearby values
| Value | Result |
|---|---|
| 36 mph to km/h | 36 mph = 57.94 km/h |
| 37 mph to km/h | 37 mph = 59.55 km/h |
| 38 mph to km/h | 38 mph = 61.16 km/h |
| 39 mph to km/h | 39 mph = 62.76 km/h |
| 40 mph to km/h | 40 mph = 64.37 km/h |
| 41 mph to km/h | 41 mph = 65.98 km/h |
| 42 mph to km/h | 42 mph = 67.59 km/h |
| 43 mph to km/h | 43 mph = 69.2 km/h |
| 44 mph to km/h | 44 mph = 70.81 km/h |
| 45 mph to km/h | 45 mph = 72.42 km/h |
| 46 mph to km/h | 46 mph = 74.03 km/h |
| 47 mph to km/h | 47 mph = 75.64 km/h |
| 48 mph to km/h | 48 mph = 77.25 km/h |
Frequently asked questions
What is 42 mph to km/h?
42 mph = 67.59 km/h (about 67.6 km/h).
How is it calculated?
Multiply by 1.609344: 42 × 1.60934 = 67.5924 km/h. Result: 42 mph ≈ 67.59 km/h.
Conversion factors follow: NIST Special Publication 811 — Guide for the Use of the International System of Units (SI); BIPM — The International System of Units (SI Brochure, 9th edition).