No. You multiply total bore by the factor being g used to determine end gap. For instance I have a 4.095" bore and am using .0095 for top ring end gap a .0085 for second ring endgap. So 4.095x.0095 gives you a .039 top gap and 4.095x.0085 gives you a .035 second ring end gap. The oil ring can be between .015 and .060 end gap. This is running Total Seal rings on forged pistons with .008 PTW clearance. Always check with your ring manufacture to see what they suggest per application. That info will vary with each manufacturer.
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