Step 3: Size the conduit at 40% fill [Chapter 9, Table 1] using Table 4. A 3-inch Schedule 40 PVC has a cross-sectional area of 2.907 sq in. for conductors, which is just the right size. Example 2 ...

Calculations work for THHN/THWN, XHHW, or USE copper or aluminum conductors. The conduit fill calculator applies to 14 AWG through 750 MCM conductor sizes, and works for EMT, ENT, FMC, IMC, PVC, Type ...