Speed Converter

Worked example

60 mph = 96.56064 km/h exactly, because 1 mph is exactly 0.44704 m/s. 100 km/h ≈ 62.13711922 mph, and 1 knot = 1.852 km/h exactly.

How it works

Numerila converts between metres per second, kilometres per hour, miles per hour, feet per second and knots, using exact constants derived from the same length units used elsewhere on the site: a mile is exactly 1,609.344 m, a foot exactly 0.3048 m and a nautical mile exactly 1,852 m, each divided by the seconds involved. A knot is one nautical mile per hour. This tool converts a plain speed magnitude only; it does not calculate pace, travel time or acceleration, and it is not a fuel-economy converter. Enter zero or more: a speed here cannot be negative.

A result written as a plain number is exact. A result starting with “≈” has been rounded to 10 significant figures, because its exact decimal never ends or is too long to read comfortably. When an exact value is long, its full digits are shown underneath. The calculation itself is never rounded: only the display is.