MONTH' (5 letters) The crossword solutions for the term 'Calendar Capacity' are 'YEAR' (4 letters) and 'MONTH' (5 letters). Calendar capacity is a measure of how much information can be stored in a calendar. It is usually measured in terms of the number of years and months that can be stored in a calendar. The two solutions, 'YEAR' and 'MONTH', refer to the two units of time that are used to measure calendar capacity.