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From Matej Ahai:
Convert Some Units is a simple application for converting units with 7 conversion categories. Values can be converted from left to right or from right to left, which is marked with a red arrow. The bottom list of all conversions for entered value and selected unit can be copied to other applications.Supported conversion categories (with units): area (acre, square mile, square yard, square foot, square inch, hectare, square kilometer, square meter, square decimeter, square centimeter, square millimeter) data (terabyte, gigabyte, megabyte, kilobyte, byte) length (mile, yard, foot, inch, nautical mile, kilometer, meter, decimeter, centimeter, millimeter) speed (miles per hour, feet per second, knots or nautical miles per hour, kilometers per hour, meters per second) temperature (Fahrenheit, Celsius, Kelvin) volume (US gallon, US quart, US pint, cubic meter, liter, deciliter) weight (long ton, short ton, stone, pound, ounce, metric ton, kilogram, decagram, gram)