Speed Converter

The Speed Converter converts a rate of motion between common units including meters per second (m/s), kilometers per hour (km/h), miles per hour (mph), knots, and feet per second (ft/s). It serves travelers reading foreign speed limits, sailors and pilots working in knots, runners and cyclists tracking pace, and engineers or students normalizing physics data. Enter a value, choose the source and destination units, and the converted speed is shown right away in the browser.

Each unit is defined relative to a base such as meters per second, so the tool divides your input down to that base and multiplies back up to the chosen output, which keeps results accurate across both tiny and large speeds. Two relationships do most of the heavy lifting: 1 km/h equals exactly 1 mph times 1.60934, and 1 knot equals exactly 1.852 km/h because a knot is one nautical mile per hour. The converter encodes these factors so you do not have to chain them manually.

Frequent uses include translating posted speed limits when driving abroad (most of the world uses km/h, the US and UK use mph), interpreting marine and aviation speeds given in knots, comparing wind speeds across weather reports, and converting lab measurements into SI units. A useful mental shortcut is that 100 km/h is about 62 mph, and 10 m/s is about 36 km/h or roughly 22 mph.

A practical tip is to be careful not to confuse speed with pace: runners often think in minutes per kilometer or mile, which is the inverse of speed, so a faster pace is a smaller number. For motion problems that also involve distance and time, combine this with the Length Converter and a Time Converter to keep all three quantities in consistent units.