リョウ, はか.る, かず
quantity, measure, weight, amount, consider, estimate, surmise
JLPT2 G4 S12 F469
The relevant bronzeware inscription form is 重# weight + grain → *measure* grain in weighing it → *weigh* → *quantity*; *amount*; *estimate*; *consider*. It is possible that the phonetic element is the obsolete grain element; compare 良 and 秝.
[Full Kanji Etymology List]