Speed Converter — km/h, mph, m/s, knots
Convert speed between kilometers per hour, miles per hour, meters per second, feet per second, and knots instantly.
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Speed Reference Chart
| Description | km/h | mph | m/s |
|---|---|---|---|
| Walking pace | 5 km/h | 3.1 mph | 1.4 m/s |
| Cycling | 20 km/h | 12.4 mph | 5.6 m/s |
| City speed limit (Nigeria) | 50 km/h | 31.1 mph | 13.9 m/s |
| Highway speed (Nigeria) | 100 km/h | 62.1 mph | 27.8 m/s |
| Expressway speed limit | 120 km/h | 74.6 mph | 33.3 m/s |
| Commercial aircraft | 900 km/h | 559 mph | 250 m/s |
| Speed of sound | 1,235 km/h | 767 mph | 343 m/s |
Frequently Asked Questions
How do I convert km/h to mph?
To convert kilometers per hour to miles per hour, multiply by 0.621371. For example, 100 km/h × 0.621371 = 62.14 mph. Nigeria uses km/h for road speeds.
What is a knot in km/h?
One knot = 1.852 km/h = 1.15078 mph. Knots are used in aviation and maritime navigation. They are based on nautical miles per hour, where 1 nautical mile = 1,852 meters.
What are typical Nigerian road speed limits?
In Nigeria, urban road speed limits are typically 50 km/h in towns and cities. Federal highways allow up to 100 km/h. Expressways (like Lagos-Ibadan) allow up to 120 km/h. These are measured in km/h.
What is the speed of sound?
The speed of sound in air at sea level (20°C) is approximately 343 m/s, or 1,235 km/h, or 767 mph, or 661 knots. This varies with temperature and altitude.
How do I convert m/s to km/h?
Multiply meters per second by 3.6 to get km/h. For example, 10 m/s × 3.6 = 36 km/h. This is because 1 km = 1,000 m and 1 hour = 3,600 seconds.