Meters per hour to millimeters per second converter above calculates how many millimeters per second are in 'X' meters per hour (where 'X' is the number of meters per hour to convert to millimeters per second). In order to convert a value from meters per hour to millimeters per second (from m/h to mm/s) just type the number of m/h to be converted to mm/s and then click on the 'convert' button.