The kanji 計 primarily conveys the idea of "to measure," "to calculate," "to plan," or "to scheme." It involves assessing, considering, and making estimations or plans. It implies the process of thinking about something in detail, often with a specific goal in mind.

・On-yomi (音読み): ⚫︎ kei (ケイ) ・Kun-yomi (訓読み): ⚫︎ hakaru (はかる)

⚫︎ 計画（けいかく） Translation: plan, project ⚫︎ 計算（けいさん） Translation: calculation, calculation ⚫︎ 時計（とけい） Translation: clock, watch (the "kei" here refers to "time measurement")

The kanji 計 is a phono-semantic compound (形声文字, keisei moji). The left side is 言 (gon), meaning "speech" or "words," and the right side is 十 (jū) and 口 (kuchi), which collectively were probably intended to suggest a person measuring (口) using a tool (十). The combination of these parts suggests the action of measuring or calculating using words. It's like using words to assess and make decisions.