KanjiJLPT N4
Measure

plot, plan, scheme, measure

Mnemonic

A scientist mutters words — counting aloud — while scratching cross tallies on a clipboard to measure each sample. Every cross she marks, she speaks the words of the running total, keeping a precise measure of everything in the lab.
Additional thoughts
Picture the classic tally system: say the number (words) and scratch a cross mark. Words + Cross = systematic counting = Measure. The spoken confirmation makes the count reliable.
Quick recall
Speak words aloud while marking each cross tally to measure the count.

Details

The keyword for 計 is measure. This kanji refers to the act of counting, calculating, or measuring quantities and values. It encompasses the broader sense of planning and devising strategies, as well as the instruments used for measurement, such as clocks, gauges, and meters. It conveys the fundamental idea of assessing or reckoning something in a systematic way.
On'yomi
けい
Kun'yomi
はか.る、はか.らう