Number + 公斤
The measure word 公斤 (gōngjīn) means kilogram and is used as the standard metric unit of weight in Chinese. It is placed after a number to express weight. One 公斤 equals approximately 2.2 pounds.
这个西瓜有五公斤重。
zhè gè xī guā yǒu wǔ gōng jīn zhòng.
This watermelon weighs five kilograms.
她每天跑步,一个月瘦了三公斤。
tā měi tiān pǎo bù, yí gè yuè shòu le sān gōng jīn.
She runs every day and lost three kilograms in one month.
请给我来两公斤苹果。
qǐng gěi wǒ lái liǎng gōng jīn píng guǒ.
Please give me two kilograms of apples.