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# Weight

Weight, or sometimes more correctly termed mass, is an item property, and is measured in the unit Γ, also sometimes known as urists, or more commonly as the kilogram, its equivalent real-life unit.

Weight is largely used by the game to determine how fast someone or something should move, due to encumbrance effects and carry weight restrictions; to calculate damage, since object mass factors into impact momentum; and to some extent to make temperature calculations, as mass factors into heat capacity. Note that, for DF, weight and mass are currently indistinguishable because, as it stands, DF gravity is uniform both across the whole universe and from world to world and buoyancy isn't implemented.

Weight is displayed as a quantity associated with an item. Weight calculation is not entirely straightforward, since each item category — or sometimes even individual items — have their own formula for determining weight.

## Weight Calculation

The general form for calculating weight in DF is to take the material density (as found in the raws) multiplied by the item's volume.

Weight (in Γ) = Density (in kg/m3) * Volume (in cm3) / 1,000,000 (cm3/m3)

Internally, all custom volume/capacity numbers are rounded down to the nearest multiple of 10 - thus, if you define a tool with [SIZE:15], it will actually behave as if you had specified [SIZE:10].

An item's volume is also used to determine workshop clutter as well as how many items can fit into a container.

## Assorted item weights

Weight displayed in-game is rounded down to a whole number.

Item Weight in Γ(kg) Notes
Iron anvil 78.5000 Same as a steel anvil.
Aluminum bar 16.2000 Least dense normal metal.
Steel bar 47.1000 Same as an iron or pig iron bar.
Platinum bar 128.4000 Most dense metal.
1 Copper coin 0.0893 Weight per coin varies with stack size, see Size for details.
500 Copper coins 2.7683 This is 0.0055366 per coin, but that varies with stack size.
500 Silver coins 3.2519 This is 0.0065038 per coin, but that varies with stack size.
500 Gold coins 5.9892 This is 0.0119784 per coin, but that varies with stack size.
Feather (wood) barrel 2.0000 Least dense wood, found only in good biomes.
Willow barrel 7.8000 Least dense common wood, found near water in many biomes.
Tunnel tube barrel 10.0000 Least dense cavern wood, found only in lower caverns.
Tower cap barrel 12.0000 Same as a barrel of acacia, ash, fungiwood, goblin-cap, mahogany, pear, or spore wood.
Blood thorn barrel 25.0000 Most dense wood, found only in lowest caverns.
Jet block 7.9200 Least dense non-economic stone.
Shale block 13.5000
Cinnabar block 48.6000 Most dense non-economic stone.
Sheep cheese 1.2000 All cheeses seem to use the default density of 1200 kg/m3.
Willow large pot 1.9500 Least dense common wood, found near water in many biomes.
Tower cap large pot 3.0000 Same as a large pot of acacia, ash, fungiwood, goblin-cap, mahogany, pear, or spore wood.
Blood thorn large pot 6.2500 Most dense wood, found only in lowest caverns.
Jet large pot 6.6000 Least dense non-economic stone.
Earthenware large pot 6.8000 Must be glazed to hold liquids (or maybe any food).
Stoneware large pot 10.0000 Does not need glazing.
Shale large pot 11.2500
Porcelain large pot 12.0150 Not an unlimited resource like other ceramics.
Glass large pot 13.0000 All three types of glass have the same density.
Cinnabar large pot 40.5000 Most dense non-economic stone.
Feather log 5.0000 Least dense wood, found only in good biomes.
Willow log 19.5000 Least dense common wood, found near water in many biomes.
Tunnel tube log 25.0000 Least dense cavern wood, found only in lower caverns.
Tower cap log 30.0000 Same as a log of acacia, ash, fungiwood, goblin-cap, mahogany, pear, or spore wood.
Blood thorn log 62.5000 Most dense wood, found only in lowest caverns.
Jet stone 132.0000 Least dense non-economic stone.
Shale stone 225.0000
Cinnabar stone 810.0000 Most dense non-economic stone.