Miles/hour (mph) vs Km/hour (km/h)
See the key differences, formulas, and conversion table.
// Side-by-side
| Miles/hour (mph) (mph) | Km/hour (km/h) (km/h) | Miles/hour (mph) (mph) ← |
|---|---|---|
| 1 mph | 1.609343 km/h | 1 km/h = 0.621372 mph |
| 5 mph | 8.046714 km/h | 5 km/h = 3.106858 mph |
| 10 mph | 16.093427 km/h | 10 km/h = 6.213717 mph |
| 20 mph | 32.186854 km/h | 20 km/h = 12.427434 mph |
| 25 mph | 40.233568 km/h | 25 km/h = 15.534292 mph |
| 50 mph | 80.467136 km/h | 50 km/h = 31.068584 mph |
| 100 mph | 160.93427 km/h | 100 km/h = 62.137169 mph |
| 200 mph | 321.86854 km/h | 200 km/h = 124.27434 mph |
| 500 mph | 804.67136 km/h | 500 km/h = 310.68584 mph |
| 1000 mph | 1,609.3427 km/h | 1000 km/h = 621.37169 mph |
Miles/hour (mph) to Km/hour (km/h) formula
Km/hour (km/h) to Miles/hour (mph) formula
How to use this comparison
Miles/hour (mph) vs Km/hour (km/h) in practice
Use this page when you need to compare Miles/hour (mph) and Km/hour (km/h) side by side, explain the difference to someone else, or sanity-check both directions at once. Use the dedicated converter when you already know the direction and just need a precise result for one value.
Best for comparison
Read the ratio, quick table, and reverse formula before choosing which unit to show in a report or product UI.
Use converter for precision
For a single value, open the mph to km/h or km/h to mph converter and keep the result tied to one direction.
Common mistake
Do not reuse the mph to km/h multiplier for the reverse direction. The reverse multiplier is 0.621372, not 1.609343.
// Frequently Asked Questions
What is the difference between Miles/hour (mph) and Km/hour (km/h)?▼
How do you convert Miles/hour (mph) to Km/hour (km/h)?▼
How do you convert Km/hour (km/h) to Miles/hour (mph)?▼
// More comparisons