Speed Converter
Convert speed between kilometres per hour, miles per hour, metres per second, knots and feet per second — all units at once.
Speed Converter
Speed — Result
3.6 kmh
1 Metre/second = 3.6 Kilometre/hour
How It Works
Speed converters anchor every unit to a base — the metre per second — and give each a conversion factor: 1 km/h = 0.2778 m/s, 1 mph = 0.447 m/s, 1 knot = 0.5144 m/s, and 1 ft/s = 0.3048 m/s. To convert, the value is multiplied by its from-unit factor to get metres per second, then divided by the to-unit factor. The most common everyday conversion is km/h to mph (multiply by about 0.621) — useful when travelling between countries that use different road-speed units. Knots (nautical miles per hour) are standard in aviation and shipping, while metres per second is the scientific standard. Speed conversion is handy for driving abroad, reading vehicle specs, understanding wind or weather reports, and sports (running pace, cycling, sailing).
Formula
Result = value × (m/s per from-unit) ÷ (m/s per to-unit). Base: metre/second. 1 km/h = 0.2778 m/s; 1 mph = 0.447 m/s; 1 knot = 0.5144 m/s.
Frequently Asked Questions
How do I convert km/h to mph?
Multiply by about 0.621. For example, 100 km/h ≈ 62.1 mph. To go the other way, multiply mph by roughly 1.609.
What is a knot?
A knot is one nautical mile per hour, equal to 1.852 km/h or about 0.514 m/s. It is the standard speed unit in aviation and maritime navigation.
How do I convert km/h to m/s?
Divide by 3.6 (or multiply by 0.2778). For example, 36 km/h = 36 ÷ 3.6 = 10 m/s. This is the standard conversion used in physics.
Which countries use mph vs km/h?
Most of the world uses km/h for road speeds; the US, UK and a few others use mph. Converting is essential when driving abroad or reading vehicle specifications from another region.
What is the fastest way to estimate km/h to mph?
A rough mental shortcut is to multiply km/h by 0.6 (e.g., 100 km/h ≈ 60 mph). For exact values, use the 0.621 factor this converter applies.