what size box to use

i need to know what size box to use .all the wire entering the box is 12
gauge.12-2 entering for the power,12-3 going to ceiling fan and 12-2
going to feed a receptacle
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Assuming no devices (this is a j box?) 7 current carrying conductors 1 for the grounds 8 total x 2.25" = 18cu/in box
if there are 2 clamps in the box add 4½ more inches.
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