Units is a powerful unit-aware calculator.
It can convert between ≈2,400 different units, making it an ideal unit converter for complex or obscure tasks. It has everything - from basic distances, volumes and temperatures, to kitchen weight-to-volume conversions, to chemistry- and physics-specific units and equations.
Units can convert between dimensions, for example, multiplying distances to get area and volume.
Units is licensed under the GPLv3 (GNU GPL version 3) and is inspired by GNU Units.