Convert speeds between the units used on roads, in science, and at sea or in the air. Useful for reading speed limits abroad, comparing running or cycling paces, and checking wind speeds in a forecast.
Formula
Result = Value × (m/s per “from” unit) ÷ (m/s per “to” unit)
1 km/h = 1,000 m ÷ 3,600 s ≈ 0.2778 m/s. 1 mph is exactly 0.44704 m/s, and 1 knot is one nautical mile (1,852 m) per hour.
Common conversions
100 km/h ≈ 62.14 mph · 60 mph ≈ 96.56 km/h · 1 m/s = 3.6 km/h · 1 knot ≈ 1.852 km/h ≈ 1.151 mph.
Frequently asked questions
How do I convert km/h to mph?
Divide by about 1.609. For example, 100 km/h ÷ 1.609 ≈ 62.1 mph.
How do I convert m/s to km/h?
Multiply by 3.6. 10 m/s is 36 km/h.
Last updated · Calculations checked by automated tests· Editorial policy