== By Diameter ==
Frequency of the hum tone generally changes linearly with the diameter (at the strike point). The volume of bronze, and hence its weight will increase by a factor of the cube of the diameter. However, foundries use a thicker profile on smaller bells so that they will ring loud enough to compete with the larger bells
, so these rules of thumb break down below 15 inches.
Modern (1950s to present) bells less than 10 inches in diameter are generally 18 to 30 pounds. Bells from 10 to 15 inches in diameter weigh from 30 to 75 pounds. Bells from 15 to 20 inches weigh from 75 to 150 pounds.