Knots, Metres per Second and Other Speed Units Explained
Learn when knots, metres per second, km/h and mph are used and how unit labels affect a GPS speed display.
Speed can be expressed in several units. Road users most often see km/h or mph; science and engineering often use metres per second (m/s); aviation and marine contexts commonly use knots. A browser speed tracker may not support every unit, so understand the conversion before interpreting a number from another instrument.
What each unit means
One metre per second equals 3.6 km/h and approximately 2.237 mph. One knot equals one nautical mile per hour, or about 1.852 km/h. These relationships let you compare units mathematically, but they do not make different instruments equivalent: one may measure wheel rotation, another may estimate movement from satellite-derived coordinates.
Why knots are different
A nautical mile is based on angular distance on Earth and is used in marine and aviation navigation. Knots are not simply another spelling of km/h. If a display is labelled knots, do not interpret its number as road speed in mph or km/h. Confirm the unit in the interface or manual before drawing conclusions.
Conversion examples
A value of 10 m/s equals 36 km/h and about 19.4 knots. A value of 20 knots is about 37 km/h. A value of 25 m/s is 90 km/h. These are rounded conversions. If your tracker only supports mph and km/h, convert an external reading separately rather than assuming the site can display a unit it does not offer.
Use units responsibly
Different sectors may use different units for good historical and operational reasons. Use the unit specified by your local road signs, activity or equipment documentation. This website is a general-purpose browser utility, not an aviation or marine navigation instrument, and its readings must not be used for safety-critical navigation.
Frequently asked questions
What is the easiest m/s to km/h conversion?
Multiply metres per second by 3.6.
Can I use a phone tracker for aviation?
No. It is not a certified navigation instrument and must not replace approved aviation equipment.
Technical references
These references explain the underlying browser and positioning concepts. They do not imply endorsement of this website.