A metric-converter watch device comprising a small watch-shaped housing having a display panel and a numeric keypad; and a microprocessor configured to perform mathematical operations and configured to convert a first English numeric value to a first metric numeric value and convert a second metric numeric value to a second English numeric value, wherein the microprocessor is operatively connected to a first conversion button, to a second conversion button, and the display panel, wherein the microprocessor is operatively connected to a battery, the battery being operatively connected to a solar panel disposed on the housing, wherein the solar panel provides power to re-charge the battery.