集裝箱計(jì)算單位（twenty-feet equivalent units，TEU）又稱換算箱、標(biāo)準(zhǔn)箱，20英尺換算單位，是以長(zhǎng)度為20英尺的集裝箱為國(guó)際計(jì)量單位（換算單位），也稱國(guó)際標(biāo)準(zhǔn)箱單位。通常用來(lái)表示船舶裝載集裝箱的能力，也是集裝箱和港口吞吐量的重要統(tǒng)計(jì)、換算單位。

目前各國(guó)大部分集裝箱運(yùn)輸，都采用20英尺和40英尺長(zhǎng)的兩種集裝箱。為使集裝箱箱數(shù)計(jì)算統(tǒng)一化，把20英尺集裝箱作為一個(gè)計(jì)算單位（換算單位），40英尺集裝箱作為兩個(gè)計(jì)算單位，以利統(tǒng)一計(jì)算集裝箱的營(yíng)運(yùn)量。

The Twenty-foot Equivalent Unit (often TEU or teu) is an inexact unit of cargo capacity often used to describe the capacity of container ships and container terminals.[1] It is based on the volume of a 20-foot long shipping container, a standard-sized metal box which can be easily transferred between different modes of transportation, such as ships, trains and trucks.[1] A related unit, the forty-foot equivalent unit (often FEU or feu) is defined as two TEU

CTU 是鐵道部規(guī)定的中國(guó)鐵路集裝箱箱數(shù)統(tǒng)計(jì)換算單位。它以 1個(gè) 10t 集裝箱為標(biāo)準(zhǔn)。 10 個(gè) 1t 箱=1 個(gè) CTU；2 個(gè) 5t 箱＝1 個(gè) CTU；1 個(gè) 10t 箱=1 個(gè) CTU：1 個(gè) 20ft 箱＝2 個(gè)CTU；1 個(gè) 40ft 箱＝4 個(gè) CTU。