2 sizes to choose from (hanging size): 
A4 Calendar :

21cm x 28cm (approx. A4)
A3 Calendar : 30cm x 40cm (approx. A3). Month-to-view layout. 13 pages. 250 gsm premium card. 1 photo for every month of the year. Durable transparent polypropylene cover. White or black pages. Metallic spiral binding. Choice of start date. Turnaround time 8 - 10 working days. A4 = £35.00, A3 = £45.00