The firkin conversion selector selects the volume measurement unit to convert to starting from firkins. To make a conversion starting from a unit of volume other than firkin, simply click on the "Reset" button.
The firkin is an old English unit of volume equal to 0.0409148269 cubic meters (1 firkin = 0.0409148269 m3), the derived unit of volume in the International System of Units (SI).
The firkin is also equal to 40,914.8269 cubic centimeters (cm3), or 40.9148269 cubic decimeters (dm3) or 4.09148269 × 10-5 cubic decameters (dam3) (units of volume in the SI), or 409.148269 deciliters (dL), or 40.9148269 liters (L), or 4.09148269 decaliters (daL) or 0.0409148269 kiloliters (kL), which are units of volume in the metric system.
The firkin is used as a unit of volume for beer and ale.
(i) For beer and ale, one firkin is equal to 9 Imperial gallons. For wine, the firkin unit is larger: one wine firkin corresponds to 1/3 tuns or about 318 liters
(ii) The term "firkin" is also used as a unit of weight for soap and butter: 1.0 firkin of soap is equal to 64 pounds (or 29 kilograms) of soap while 1.0 firkin of butter corresponds to 56 pounds (or 25.4 kilograms) of butter