So, in Storm King's Thunder there's this boulder trap that tries to crush the player's characters, and a stone giant statue that grabs the thing and rolls it back to its place. Just gonna calc the weight and stuff.
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On initiative count 15, a 40-foot-diameter sphere of solid granite phases out of the north wall at area 8C and rolls southward down the corridor. It rolls 200 feet on each of its turns until it reaches the end of the hall. When the sphere reaches the south end of the hallway, the stone giant statue (area 8A) animates and uses its outstretched arms to stop the sphere before it slams into the wall around the alcove. Each round thereafter on initiative count 15, the statue moves 20 feet northward, rolling the sphere ahead of it. The statue and sphere move slowly enough that creatures can easily get out of the way. |
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So, the boulder is a sphere of 40 feet of diameter, made out of solid granite. That gives it a volume of about 33510 cubic feet, and with granite having a density of 165 pounds per cubic feet, it'd give it a weight of about 5,529,150 pounds or 2,507,980 kilograms.
It also rolls 200 feet per 6 seconds (a turn, roughly), so about 10.16 m/s, giving it a KE of 129,443,870 joules, or 9-A.
The Stone Giant Statue stops it, and it's CR 0, so every single being in the verse scales to it. Cool.