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When diving doubles you will need to use your wing/BCD to compensation. Typically you can't control your buoyancy only with a drysuit with steel doubles and stage bottles so you will need to use your wing to offset buoyancy.
Here is the calculator for BCD. You could enter decimal or packed BCD and get the conversion. Of course this can be done in mind (and this is the advantage of BCD), but just let the computer do it for you.