I can never remember how much area each format of film covers, which is a useful bit of information to have when you are keeping track of how many “rolls” you’ve run through a batch of chemicals (monobath, for example).

So here it is:

1 roll 36 exposure 35mm film

= 1 roll 120 film

= 4 sheets 4x5 film

= 1 sheet 8x10 film