Editing v0.31:Weight

{{Quality|Exceptional}}{{av}}

'''Weight''' is an item property, and is measured in units '''Γ''', also known as '''urists''' - one unit urist is equivalent to one real kilogram.

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 [http://www.bay12games.com/media/df_talk_8_transcript.html 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 'd' as found in the raws multiplied by an item constant C.

:W = d * C / 100,000

The formula for C is [http://www.bay12games.com/dwarves/mantisbt/view.php?id=1386 almost always] the same for all items in the same raw file(such as item_helm or item_pants).  These variations are thought to be caused by bugs, though confirmation is needed.  Note that the displayed weight value is truncated and not rounded after the calculation is done, it is thought that the exact weight is maintained internally.

The following table lists all currently known formulas for finding the value of C.
{| {{prettytable}}
|- bgcolor="#999999"
! Category
! Formula
! Notes

|-
| [[Bar]]s
| 200
|

|-
| Cut [[gem]]s
| 20
|

|-
| [[Block]]s
| 250
|

|-
| Rough [[gem]]s
| 250
|

|-
| Mined [[stone]]
| 7000
|

|-
| Wood [[log]]s
| 5000
|

|-
| [[Door]]
| 3000
|

|-
| [[Floodgate]]
| 3000
|

|-
| [[Bed]]
| 3000
|

|-
| [[Chair]]
| 3000
|

|-
| [[Chain]]
| 500
|

|-
| [[Flask]]
| 100
|

|-
| [[Goblet]]
| 100
|

|-
| [[Instrument]]
| 400
|

|-
| [[Toy]]
| 100
|

|-
| [[Window]]
| 2000
|

|-
| [[Cage]]
| 3000
|

|-
| [[Barrel]]
| 2000
|

|-
| [[Bucket]]
| 300
|

|-
| [[Animal trap]]
| 300
|

|-
| [[Table]]
| 3000
|

|-
| [[Coffin]]
| 3000
|

|-
| [[Statue]]
| 6000
|

|-
| [[Corpse]]
| Special
| 

|-
| [[Weapon]]
| SIZE / 10
|

|-
| item_armor
| <s>(layer size/ material size)/<br> 1 010</s>
| Based on UBSTEP, LBSTEP, COVERAGE, LAYER_SIZE, and the race that crafted it

|-
| item_shoes
| <s>layer size/ 7 500</s>
| Based on UPSTEP, COVERAGE, LAYER_SIZE, and the race that crafted it

|-
| item_shield
| <s>1/ 100 000</s>
| Based on UPSTEP and the race that crafted it

|-
| item_helm
| <s>layer size/ 60 000</s>
| Based on COVERAGE, LAYER_SIZE, and the race that crafted it

|-
| item_gloves
| <s>1/ 100 000</s>
| Based on UPSTEP, COVERAGE, LAYER_SIZE, and the race that crafted it

|-
| [[Box]]
| 2000 or 100
| Bags weigh 100, boxes/chests/coffers weigh 2000

|-
| [[Bin]]
| 1500
|

|-
| [[Armor stand]]
| 1000
|

|-
| [[Weapon rack]]
| 1000
|

|-
| [[Cabinet]]
| 3000
|

|-
| [[Figurine]]
| 100
|

|-
| [[Amulet]]
| 50
|

|-
| [[Scepter]]
| 300
|

|-
| [[Ammo]]
| SIZE / 10
|

|-
| [[Crown]]
| 100
|

|-
| [[Ring]]
| 5
|

|-
| [[Earring]]
| 3
|

|-
| [[Bracelet]]
| 20
|

|-
| [[Large gem]]
| 5
|

|-
| [[Anvil]]
| 1000
|

|-
| [[Body part]]
| Special
|

|-
| [[Remains]]
| 200
|

|-
| [[Meat]]
| 200
|

|-
| [[Fish]]
| 200
|

|-
| Unprepared [[fish]]
| 200
|

|-
| Live [[vermin]]
| Special
|

|-
| Tame [[vermin]]
| Special
|

|-
| [[Seed]]s
| 10
|

|-
| [[Plant]]
| 100
|

|-
| [[Leather]]
| 500
|

|-
| [[Leaves]]
| 5
|

|-
| [[Thread]]
| ceil(Dimension/500)
| 20 for freshly extracted/gathered thread

|-
| [[Cloth]]
| ceil(Dimension/500)
| 30 for freshly woven cloth

|-
| [[Totem]]
| 500
|

|-
| item_pants
| <s>layer size/ 5 190</s>
| Based on LBSTEP, COVERAGE, LAYER_SIZE, and the race that crafted it

|-
| [[Backpack]]
| 500
|

|-
| [[Quiver]]
| 300
|

|-
| [[Catapult parts]]
| 2000
|

|-
| [[Ballista parts]]
| 2000
|

|-
| [[Siege ammo]]
| 3000
|

|-
| [[Ballista arrow head]]
| 1000
|

|-
| [[Mechanism]]s
| 2000
|

|-
| [[Trap component]]
| SIZE/10
|

|-
| [[Alcohol|Drink]]
| 200
|

|-
| [[Mill|Powder]]
| 200
|

|-
| [[Cheese]]
| 100
|

|-
| [[Prepared meal]]
| 100
|

|-
| [[Extract|Misc. liquid]]
| 200
|

|-
| [[Coin]]
| 1
| Seemingly divided further

|-
| [[Fat|Glob]]
| 200
|

|-
| Small [[rock]]
| 200
| As [[Thrower|thrown]] by adventurers

|-
| [[Pipe section]]
| 3000
|

|-
| [[Hatch cover]]
| 1000
|

|-
| [[Grate]]
| 1000
|

|-
| [[Quern]]
| 3000
|

|-
| [[Millstone]]
| 3000
|

|-
| [[Splint]]
| 200
|

|-
| [[Crutch]]
| 200
|

|-
| [[Traction bench]]
| 3000
|

|-
| Orthopedic [[cast]]
| 200
|

|-
| [[Tool]]
| 100
| Should be SIZE/10{{bug|4979}}

|-
| [[Slab]]
| 6000
|

|-
| [[Egg]]
| Special
|

|}

These values are up to date as of version 0.31.25.

Other examples: stack of cheap stones, or stone statue, 161-167 Γ. Steel chainmail 19 Γ. Steel or bronze bars, 15-16 Γ. Iron flask, 12 Γ.
The heaviest metal is [[Main:Platinum|Platinum]], and the lightest metal is [[Main:Adamantine|Adamantine]].