9cm (3.5in) tall, 8cm (just over 3in) diameter.
I bought it from a charity shop and improved it. (Please note that this mug is lovely but a little scuffed because it’s second hand.) It’s a bit like the way I draw on photographs, except I drew on a mug instead.
I drew on the mug with porcelain pens, so the added markings are dishwasher safe. This mug *seems* to be dishwasher safe, but I don’t know how to tell for sure.