This calculator helps you estimate the distance travelled after a certain time of constant speed. It also converts to alternative speed units: mile/hr, km/h, m/s, mach, ...
Most countries use the Metric System, which uses the measuring units such as meters and grams and adds prefixes like kilo, milli and centi to count orders of magnitude.
38.6 m/s
3.86 * 101 m/s (scientific)
38.6 m/s (engineering)
In the USA and UK, the older Imperial system is used, where things are measured in feet, inches and pounds.
138 960 m/hr
127 ft/sec
1.00 secs
1 sec
1 sec(s)
38.6 meter
38.6 * 103 mm
3.86 * 103 cm
1.52 * 103 in
126.64 ft
42.21 yard
38.6 m
38.6 * 10-3 km
23.98 * 10-3 mile
20.84 * 10-3 nautical mile