Road Distance & Speed Conversions for Travelers
The US, UK, Liberia, and Myanmar use miles — the rest of the world uses kilometers. When you rent a car or read road signs abroad, knowing how to quickly convert km/h to mph (or vice versa) keeps you driving legally and safely. Use the tables and formulas below to build an intuition for distances and speed limits in unfamiliar countries.
Quick Reference: Distance & Speed
- 1 mile = 1.609 km
- 1 km = 0.621 miles
- 100 km/h ≈ 62 mph
- 60 mph ≈ 97 km/h
- 130 km/h ≈ 81 mph
- 70 mph ≈ 113 km/h
Driving Units Around the World
Rental cars in Europe display speedometers in km/h, while US-rented cars show mph. Germany's famous autobahn has unrestricted sections, though the advisory maximum is 130 km/h (81 mph). Japan's expressways are capped at 120 km/h (75 mph). Most Australian highways run at 100–110 km/h (62–68 mph).
Fuel is sold in liters almost everywhere outside the US. If you're comparing fuel economy, note that US miles-per-gallon uses US gallons (3.785 L), while the UK uses imperial gallons (4.546 L) — so UK mpg figures are about 20% higher than US mpg for the same vehicle.
A quick mental shortcut for km/h → mph: multiply by 0.6. It's slightly low but accurate enough for reading speed limit signs at a glance (100 × 0.6 = 60, actual = 62.1).
mph to km/h — Common Speed Limits
| mph | km/h |
|---|---|
| 25 mph | 40 km/h |
| 30 mph | 48 km/h |
| 35 mph | 56 km/h |
| 40 mph | 64 km/h |
| 45 mph | 72 km/h |
| 55 mph | 89 km/h |
| 60 mph | 97 km/h |
| 65 mph | 105 km/h |
| 70 mph | 113 km/h |
| 75 mph | 121 km/h |
| 80 mph | 129 km/h |
Speed Limits by Country / Region
| Region | Speed Limit (mph) | Speed Limit (km/h) |
|---|---|---|
| US — residential | 25 mph | 40 km/h |
| US — highway | 55–75 mph | 88–121 km/h |
| UK — motorway | 70 mph | 113 km/h |
| Europe — motorway | 62–81 mph | 100–130 km/h |
| Australia — highway | 62–68 mph | 100–110 km/h |
| Japan — expressway | 62–75 mph | 100–120 km/h |
| Germany — Autobahn | No limit (advisory 81 mph) | No limit (advisory 130 km/h) |
| Canada — highway | 62–68 mph | 100–110 km/h |
Distance Quick Reference
| Kilometers | Miles | Miles | Kilometers |
|---|---|---|---|
| 50 km | 31.1 mi | 50 mi | 80.5 km |
| 100 km | 62.1 mi | 100 mi | 160.9 km |
| 200 km | 124.3 mi | 200 mi | 321.9 km |
| 500 km | 310.7 mi | 500 mi | 804.7 km |
Frequently Asked Questions
How do I convert km/h to mph while driving?
Multiply by 0.6 for a quick mental estimate — it's slightly low but good enough for reading speed limit signs. For a more precise conversion, multiply by 0.621. For example, 120 km/h × 0.621 = 74.5 mph. Many modern smartphones and GPS devices will display your speed in either unit when you switch the settings.
What countries use miles instead of kilometers?
Only the United States, Liberia, and Myanmar use miles for road distances and speed limits as their primary system. The United Kingdom also uses miles on road signs and speed limits (mph), despite being officially metric in most other contexts.
How fast is 130 km/h in mph?
130 km/h = 80.8 mph. This is the maximum posted speed limit on motorways in France, Spain, and Italy. It's also the advisory (recommended) maximum on Germany's autobahn in wet conditions, even on unrestricted sections. At this speed, a vehicle covers about 36 meters (118 feet) per second.