kg is the written short form of kilogram or kilograms, the usual unit for how heavy something is. A bag of rice, a person’s weight, a suitcase at the airport: these are often written in kg. You see it on packets, on scales, and in maths.

kg「kg」 is the written short form是書寫上的縮寫 of kilogram or kilograms指 kilogram 或 kilograms, the usual unit通常的單位 for how heavy something is指某樣東西有多重。A bag of rice, a person's weight, a suitcase at the airport一袋米、一個人的體重、機場的行李箱: these這些 are often written常被寫成 in kg「kg」。You你 see it會看到它 on packets在包裝上, on scales在磅秤上, and和 in maths在數學裡。

When we speak, we usually say “kilogram” or “kilo,” not the letters; the letters are mainly for writing.

When we speak當我們說話時, we我們 usually say通常說 "kilogram" or "kilo,"「kilogram」公斤或「kilo」, not the letters而不是唸字母; the letters這些字母 are mainly for writing主要是給書寫用的。

It is the international symbol, so it is written kg in small letters, and we do not add an s: 3 kg, not 3 kgs. Though actually, people do write kgs in casual notes, but that is not the correct symbol.

It它 is the international symbol是國際符號, so所以 it它 is written寫成 kg in small letters小寫的 kg, and而 we do not add an s不加 s: 3 kg「3 kg」, not 3 kgs而不是「3 kgs」。Though actually但其實, people人們 do write確實會寫 kgs「kgs」 in casual notes在隨手寫的筆記裡, but但 that那 is not the correct symbol不是正確的符號。

One kilogram is 1,000 grams.

One kilogram一公斤 is 1,000 grams是一千公克。

Do not mix kg with km (kilometre, for distance) or with lb (pounds, still common in the US).

Do not mix不要搞混 kg「kg」 with km「km」 (kilometre, for distance公里，用於距離) or with lb或跟「lb」 (pounds, still common in the US磅，在美國仍常用)。