計
This Chinese character means measure.
You can watch how to write this. - (「計」の書き順（筆順）動画 - 漢字書き順辞典)
There are 2 main ways to read this, "はかる (計る)" or "けい".
When this is combined with other Chinese characters, this is often read as "けい".
For example, "計測 (けいそく)" means measure.
"計算 (けいさん)" means calculation.
"会計 (かいけい)" means account, accounting.
If you want to learn accounting, you need to understand bookkeeping.
By Higashi-Mikawa Kyōjindō Shujin (東三河狂人堂主人)