Road signs in Canada, Europe, Australia and most of the world give speed limits in kilometers per hour. Rental cars there usually have km/h speedometers too, and treadmills, bike computers and car spec sheets from abroad all use the metric unit. This converter gives the exact mph figure, plus meters per second and the time per mile at that speed — useful for runners and cyclists.
How to use the km/h to mph converter
- Enter a speed in Kilometers per hour (km/h).
- Read the result in mph. Underneath you’ll see meters per second and the Time per mile at that speed.
- The chart runs from 5 km/h (a walk) to 300 km/h (high-speed rail).
km/h to mph formula
Dividing by 1.609344 is exact; the multiplier 0.621371 is rounded.
Worked example: a 100 km/h highway sign
Step 1. 100 ÷ 1.609344 = 62.137 mph.
Step 2. In meters per second: 100 ÷ 3.6 = 27.778 m/s.
Shortcut check. 100 × 5 ÷ 8 = 62.5 mph — close enough to judge your speed.
Example: a treadmill at 12 km/h
Gyms outside the US set treadmills in km/h, while many American runners think in minutes per mile.
Step 1. 12 ÷ 1.609344 = 7.456 mph.
Step 2. Time per mile: 60 ÷ 7.456 = 8.047 minutes, or 8:03 per mile.
At 10 km/h the pace is 9:39 per mile; at 15 km/h it is 6:26. The running pace calculator converts paces and race times in both systems.
Common km/h speed limits in mph
| Limit | km/h | mph | Where you’ll see it |
|---|---|---|---|
| Low-speed zone | 30 | 18.64 | School zones, many European city streets |
| Urban default | 50 | 31.07 | Built-up areas in much of Europe and Canada |
| Rural road | 80 | 49.71 | Secondary roads |
| Rural road | 90 | 55.92 | Main roads in several European countries |
| Highway | 100 | 62.14 | Canadian highways, many expressways |
| Highway | 110 | 68.35 | Faster Canadian and Australian highways |
| Motorway | 120 | 74.56 | Motorways in several European countries |
| Motorway | 130 | 80.78 | Motorways in France, Italy and others; the advisory speed on German autobahns |
Limits vary by country and change with weather and local rules, so treat this table as a conversion aid rather than a legal guide.
Fast things in km/h
| Vehicle | km/h | mph |
|---|---|---|
| Fast road cyclist | 40 | 24.85 |
| Typical sports car top speed | 250 | 155.34 |
| High-speed train in service | 300 | 186.41 |
Mental shortcuts
- ×5 ÷ 8: the most accurate easy rule, about 0.6% high. 80 → 50, 120 → 75, 160 → 100.
- ×0.6 and add a bit: 130 × 0.6 = 78, plus a little gives about 81 mph (exact 80.78).
- Fibonacci pairs: 8 km/h ≈ 5 mph, 13 ≈ 8, 21 ≈ 13, 34 ≈ 21 — the same trick that works for distances.
For the reverse direction, see mph to km/h. If you’re converting a distance rather than a speed, the km to miles converter uses the same factor.
Frequently asked questions
How many mph is 1 km/h?
1 km/h is 0.621371 mph. Divide by 1.609344 for an exact result, because a mile is exactly 1.609344 km.
What is 100 km/h in mph?
100 km/h is 62.14 mph — the standard highway limit in much of Canada and on many European roads outside motorways.
What is 120 km/h in mph?
120 km/h is 74.56 mph, just under 75 mph.
How do I convert km/h to meters per second?
Divide by 3.6. For example, 100 km/h ÷ 3.6 = 27.78 m/s, since there are 1,000 meters in a kilometer and 3,600 seconds in an hour.
What is the quickest way to estimate km/h to mph?
Multiply by 5 and divide by 8 — 80 km/h becomes 50 mph (exact 49.71). Multiplying by 0.6 is also easy but runs about 3.4% low, so add a little.