How to convert miles per hour to kilometers per hour
Multiply the miles per hour by 1.609344, because a mile is exactly 1.609344 kilometers. To go from kilometers per hour to mph, divide by 1.609344.
Here it is with your numbers:
- Multiply by 1.609344: 60 × 1.609344 = 96.56064.
- Round to 4 decimals: 96.5606 km/h.
It means 60 miles per hour is 96.5606 kilometers per hour, or 97 km/h to the nearest whole number.
Source NIST Guide to the SI (SP 811) · Appendix B.8, factors for units listed alphabetically ↗
mph to km/h chart
| mph | km/h |
|---|---|
| 5 mph | 8.0467 km/h |
| 10 mph | 16.0934 km/h |
| 15 mph | 24.1402 km/h |
| 20 mph | 32.1869 km/h |
| 25 mph | 40.2336 km/h |
| 30 mph | 48.2803 km/h |
| 35 mph | 56.3270 km/h |
| 40 mph | 64.3738 km/h |
| 45 mph | 72.4205 km/h |
| 50 mph | 80.4672 km/h |
| 55 mph | 88.5139 km/h |
| 60 mph | 96.5606 km/h |
| 65 mph | 104.6074 km/h |
| 70 mph | 112.6541 km/h |
| 75 mph | 120.7008 km/h |
| 80 mph | 128.7475 km/h |
| 100 mph | 160.9344 km/h |
km/h to mph chart
| km/h | mph |
|---|---|
| 10 km/h | 6.2137 mph |
| 20 km/h | 12.4274 mph |
| 30 km/h | 18.6411 mph |
| 40 km/h | 24.8548 mph |
| 50 km/h | 31.0686 mph |
| 60 km/h | 37.2823 mph |
| 70 km/h | 43.4960 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 | 80.7783 mph |
| 150 km/h | 93.2057 mph |
| 200 km/h | 124.2742 mph |
| 300 km/h | 186.4114 mph |
Every converted figure is rounded to 4 decimals, and the nearest whole number is taken from that figure.
Is 1 mph exactly 1.609344 km/h?
Yes. 1 mile is defined as exactly 1.609344 kilometers (5,280 feet of exactly 0.3048 m), so 1 mile per hour is exactly 1.609344 km/h, and NIST lists it as an exact factor. Going the other way, 1 km/h is 0.621371192… mph, a decimal that never ends, which is why km/h to mph is rounded.
Feet per second is mph × 5,280 ÷ 3,600 (60 mph is 88 ft/s), and meters per second is km/h × 1,000 ÷ 3,600, because an hour is 3,600 seconds.
Source NIST Handbook 44 (2026) · Appendix C, General Tables of Units of Measurement ↗
FAQs
How do you convert mph to km per hour?
Multiply the mph by 1.609344. For a quick figure in your head, multiply by 1.6: 50 mph is about 80 km/h (exactly 80.4672 km/h).
Source NIST Guide to the SI (SP 811) · Appendix B.8, factors for units listed alphabetically ↗
How do you convert km/h to mph?
Divide the km/h by 1.609344. 50 km/h is 31.0686 mph: 50 ÷ 1.609344 = 31.06855961…, rounded to 4 decimals.
How fast is 60 mph in km?
60 mph is 96.5606 km/h (60 × 1.609344 = 96.56064), or 97 km/h to the nearest whole number. So it is a little under 100 km/h, which is 62.1371 mph.
How fast is 40 mph in km?
40 mph is 64.3738 km/h (40 × 1.609344 = 64.37376), or 64 km/h to the nearest whole number.
How fast is 60 km in mph?
60 km/h is 37.2823 mph (60 ÷ 1.609344 = 37.28227153…), or 37 mph to the nearest whole number.
What is 100 km in mph?
100 km/h is 62.1371 mph (100 ÷ 1.609344 = 62.13711922…), or 62 mph to the nearest whole number.
Sources
- NIST Guide to the SI (SP 811): Appendix B.8, factors for units listed alphabetically
- NIST Handbook 44 (2026): Appendix C, General Tables of Units of Measurement