777: How to set CG to produce takeoff trim in FMC?

[JSACKS 0]

In the FMC for the 777, there's a field for the CG which then yields the takeoff trim. How do I find the CG for any given weight of the plane in order to be able to get the correct trim? Up till now, I've been guesstimating based on my PMDG 747-400 but that's not really a good or safe practice, I feel.Thanks!Jonathan Sacks

[Jim Harnes 13]

The PSS 777 load configuration program gives you %MAC (COG) to enter in the CDU.Jim Harnes

[JSACKS 0]

Oops, sorry, I missed that! Thanks!JS