Weight & density comparator
The same volume of different materials weighs wildly different amounts — a liter of gold is not a liter of feathers. Pick a volume and see the weight across metals, wood, liquids, gases and gemstones.
Gemstone carat comparator
A 1-carat diamond and a 1-carat ruby weigh exactly the same — but they're not the same size, because the stones have different densities. Enter a carat weight to compare.
Why gold feels so heavy
Weight (for a fixed volume) comes down entirely to density — how tightly the material's atoms are packed. Platinum and gold are dense metals, so even a small amount is heavy; wood and gases are the opposite, mostly empty space between light atoms, so the same volume weighs very little.
Are gas densities always the same?
No — gas density changes a lot with temperature and pressure. The values here use standard conditions (0°C, normal atmospheric pressure). Warm air, for example, is less dense than cold air, which is exactly why hot air balloons float.
Is my data sent anywhere?
No — this runs entirely in your browser with plain JavaScript. Nothing is uploaded.