KPH to MPH converter
1 km/h = 0.621371192237 mph
Divide km/h by 1.609 344. Rental-car speedometers and European speed-limit signs are the usual reasons to check this.
100 km/h = 62.13711922 mph
Formula: mph = km/h ÷ 1.609344
100 km/h in every speed unit
- metre per second
- mile per hour
- knot
- foot per second
How to convert kilometres per hour to miles per hour
mph = km/h ÷ 1.609344
Example: 100 km/h × 0.621371192237 = 62.13711922 mph.
kilometre per hour: 1 km/h = 1000 m ÷ 3600 s = 1/3.6 m/s (BIPM SI Brochure)
mile per hour: 1 mph = 1609.344 m ÷ 3600 s = 0.447 04 m/s (NIST SP 811, App. B (1959 yard & pound agreement))
Going the other way? Use the mph to kph converter.
Where the number 0.62137119 comes from
Nothing is measured here. Every step below is a definition written into law or into the SI.
1 km/h
KPH to MPH table
| kilometres per hour (km/h) | miles per hour (mph) |
|---|---|
| 10 | 6.213712 |
| 20 | 12.42742 |
| 30 | 18.64114 |
| 40 | 24.85485 |
| 50 | 31.06856 |
| 60 | 37.28227 |
| 70 | 43.49598 |
| 80 | 49.7097 |
| 90 | 55.92341 |
| 100 | 62.13712 |
| 110 | 68.35083 |
| 120 | 74.56454 |
| 130 | 80.77825 |
| 140 | 86.99197 |
| 150 | 93.20568 |
| 160 | 99.41939 |
| 200 | 124.2742 |
| 250 | 155.3428 |
| 300 | 186.4114 |
Questions
How many miles per hour are in 1 kilometre per hour?
1 km/h = 0.621371192237 mph.
What is the formula to convert kilometres per hour to miles per hour?
mph = km/h ÷ 1.609344. 1 km/h = 1000 m ÷ 3600 s = 1/3.6 m/s; 1 mph = 1609.344 m ÷ 3600 s = 0.447 04 m/s.
Is this conversion exact?
Yes. Both units are defined exactly (BIPM SI Brochure; NIST SP 811, App. B (1959 yard & pound agreement)), so the factor is exact and results are only rounded for display.
What is 100 km/h in mph?
100 km/h = 62.13711922 mph.