Density is mass per volume. Water at about 4 °C has a density of 1,000 kg/m³, which is exactly 1 g/cm³ or 1 g/mL, a handy reference point. The same value is about 62.43 lb/ft³ or 8.345 lb per US gallon. This converter moves between SI, CGS and imperial density units. It is useful for material selection (aluminium is about 2,700 kg/m³, steel about 7,850 kg/m³), lab work, and shipping calculations where you need to estimate weight from a volume.
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