ConvertRuler

ConvertRuler converts everyday units and remembers how you work. Compare the same value across units, save named one-tap presets, and paste or copy results. Built-in length, weight, temperature, volume, and speed. Favorite units, keep the last 20 conversions, and define custom units with a multiplier to SI. Utilities must do more than a single field — that is why history, favorites, and custom units are first-class.