The kanji 計 generally conveys the idea of "to measure," "to calculate," "to plan," or "to scheme." It involves assessing, estimating, or devising something, whether it be a quantity, a course of action, or a strategic plan. It implies a degree of forethought and consideration.

・On-yomi (音読み): ・ケイ (kei) ・Kun-yomi (訓読み): ・はか（る） (haka(ru))

⚫︎ 計画（けいかく） Translation: plan, project ⚫︎ 計算（けいさん） Translation: calculation ⚫︎ 時計（とけい） Translation: clock, watch

The kanji 計 is a phono-semantic compound (形声文字). The phonetic component is "言" (げん/gon), meaning "to speak" or "words." The semantic component is "十" (じゅう/juu), meaning "ten". The original meaning of 計 may have been related to counting or calculating. The "言" (words) part indicates that it involves a process, which is spoken of in a way that provides information and "十" has some connotations with the numerical system, which implies measuring and assessment. Over time, its meaning expanded to include planning and scheming.