All small shades
3x4x4 | 3x5x4
All medium shades
3.5×5.5×4 | 4.5x5x4.5 | 3x5x4.75 | 3x5x5 | 3.5×5.5×5 | 3x6x5 | 4.5×5×5
Choosing a shade size is a very subjective decision, but understanding certain conventions can be helpful. The object of shading a chandelier, fixture, buffet lamp, etc., is to cover the socket 100% and expose a portion of the candle cover. If the candle cover is decorative (like a plastic cover with faux wax drips on the sides), you typically want to show more of this. A fixture with short candle covers typically calls for shorter shades. Fixtures with tall candle covers can use taller shades, or short shades if you want to expose more of the cover.
Many candelabras have a bobeche under each candle. While the original intent (before electricity) of a bobeche was to catch wax drippings from candles in chandeliers, they now provide a decorative element below the bulb and candle cover. Select a shade that will expose both the candle cover and bobeche for added style.