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Sometimes I have been in the situation where I needed to pull 4 12/2 w/G's in the blue box to connect to other circuits. I only count all the grounds 1 time, each individual conductor 1 time, the yoke (switch or receptacle) 2 times and each wire nut (clamp) 1 time.
As mentioned above, wire nuts are not clamps. See 314.16.

Clamps attach the cable to the box, not conductors together. [Linked Image]

The easiest way to keep these things straight when first getting them straight, IMO, is to go down the list one by one:

So 4 12-2's with 1 device are
8 insulated conductors (314.16(B)(1))
0 Clamps (314.16(B)(2))
0 Support Fittings (314.16(B)(3))
2 counts for 1 device (314.16(B)(4))
1 count for all EGC's (314.16(B)(5))


Is 11 conductors x 2.25 = 24.75 cu.in.

That's way over for a single gang, even Carlon. (gfret, box fill is something best understood when the same math is done four different ways. [Linked Image] )

-George