Please refer to the below size guide for details of our lampshade measurements. 
 
 
Shade Style  Base Diameter (inches) Top Diameter (inches) Slope (inches)
Empire 8" 4" 6"
Empire 10" 5" 7"

Empire

12" 6" 8"

Pembroke

14" 9" 9"

 Pembroke

16" 10" 10"
Pembroke 18" 11.5" 11.5"
Pembroke 20" 13" 13"
Pembroke 22" 14" 14"
Pembroke 24" 15" 15"
 
SHADE FITTINGS 
All Empire shades ( sizes 8"-12") have in-built shade carriers. For our Pembroke shades, please see below for our recommended shade carrier (UK) and finial harp fitting (US) sizes:

 

14” Shades -  5” Shade Carrier (UK) and 8" finial harp fitting (US)
16” Shades - 6” Shade Carrier (UK)  and 9" finial harp fitting (US)
18” Shades - 7-8” Shade Carrier  (UK) and 10" finial harp fitting (US)
20"-24" Shades - 9-12” Shade Carriers  (UK) and 11" finial harp fitting (US)