A wall calendar is read from a few feet away. Large date numbers, a portrait month, and a family or large-box layout help. You hang one month or a 12-up year. You do not need hour rows on the wall; those become noise.
A desk calendar is read at arm’s length. Landscape months, compact blotters, and horizontal weeks belong here. The sheet may sit under a keyboard or on a clipboard. Writing room matters more than numeral size.
Choose the paper orientation for the furniture, not for a habit. A fridge magnet that only grips the short side of Letter will drop a landscape sheet. A shallow desk tray will curl a portrait month that hangs off the edge.
Ink style can follow the room. A kitchen wall can use a rust or forest title. A shared office copier is kinder to ink-saver gray. High contrast photocopies more cleanly than a light gray rule.
If one household needs both, print a family wall month and a weekly desk planner for the busy week. They are different jobs. Forcing hours onto a wall month makes the type too small to read from the hallway.
Two-page months are a wall format if you have the width for two sheets side by side. They are a desk format if you keep them in a folder and flip the half-month. Measure the space before you print a year of spreads.