Every serving is counted as one standard 1" x 2" x 4" slice (1.5" x 2" x 4" for parties), so a taller tier is simply cut into more slices of the same size and every guest gets an equal piece. Base counts follow the Wilton Test Kitchen serving guide (its 4"-tall standard), scaled by your tier height. This is a planning guide only — actual yield can vary with your baker’s cut.