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This module can be used to quickly add a new unit for use with {{convert}}. When satisfied that a unit is working correctly, ask at en:Module talk:Convert for the unit to be moved to the permanent list of units.

See en:Template:Convert/unit sandbox for a good way to prepare unit definitions that can be copied into this page.

The following extracts from Module:Convert/data show examples that could be used to define a new unit. Any number of spaces can be used where blanks are shown in the following.

Field Description
symbol Unit identifier used when abbr=on is in effect.
name1 Singular name of the unit used when abbr=off is in effect.
name2 Plural name of the unit; not required if it is the same as name1 plus "s".
name1_us Singular name when sp=us is in effect; not required if the same as name1.
name2_us Plural name when sp=us is in effect; not required if the same as name1_us plus "s".
utype Unit type; must be exactly the same as the utype of any other unit used in a conversion.
scale Number of base units in the unit being defined.
default Unit code of the default output used when no output unit is specified in a conversion.
target Unit code of an existing unit (the unit being defined "redirects" to the existing unit).
prefixes Use 1 if an SI prefix is accepted; 2 is used for m2, and 3 is used for m3.
link Article title used when lk=on is in effect; not required if it is the same as name1.

-- Extra conversion data used by Module:Convert.
-- [[Module:Convert/data]] defines all units and is transcluded in all pages
-- where [[Module:Convert]] is used. Testing new units by editing that module
-- would invalidate the cache for all affected pages.
-- For quick changes and experiments with new units, this module can be edited.
-- Since this module is transcluded in only a small number of pages, changes
-- should cause little server overhead and should propagate quickly.
-- If a unit is defined in the data module, any definition here is ignored,
-- so defining the same unit in both modules is not an error.
-- A unit defined here can refer to units that are also defined here, and
-- can refer to units defined in the data module.
-- Periodically, those extra units that are wanted permanently can be removed
-- from here after being added to [[Module:Convert/data]].

local extra_units = {
    ["kWh/100mi"] = {
	name1    = "kilowatt-hour per 100 miles",
	name2    = "kilowatt-hours per 100 miles",
	symbol   = "kW-hrs/100 mi",
	utype    = "energy per unit length",
	scale    = 22.3694,
	default  = "mpge",
	link     = "Miles per gallon gasoline equivalent",
    ["kWh/100km"] = {
	name1    = "kilowatt-hour per 100 kilometres",
	name2    = "kilowatt-hours per 100 kilometres",
	symbol   = "kW-hrs/100 km",
	utype    = "energy per unit length",
	scale    = 36,
	default  = "kWh/100mi",
	link     = "Miles per gallon gasoline equivalent",
    -- EPA mpg-e
	["mpge"] = {
	name1    = "mile per gallon gasoline equivalent",
	name2    = "miles per gallon gasoline equivalent",
	symbol   = "mpg-e",
	utype    = "energy per unit length",
	invert   = -1,
	iscomplex= true,
	scale    = 13.00e-6,
	default  = "kWh/100mi",
	link     = "Miles per gallon gasoline equivalent",

return { extra_units = extra_units }