Yes. Printing double-sided (duplex) fits two calendar pages on one sheet and cuts a full year from twelve sheets down to six. It is the standard way to turn a monthly calendar into a slim booklet, and almost every recent printer can do it.
Two things are worth getting right, show-through and which edge you bind, but both are easy once you know to check. Here is how to save the paper without a messy result.
How duplex printing works
There are two ways to print both sides. Automatic duplex means the printer flips each sheet for you, so you just tick Print on both sides in the dialog and walk away. Manual duplex prints all the front pages first, then prompts you to reload the stack to print the backs.
Check your print dialog for a "both sides" or "duplex" option; if it is missing, your printer needs the manual method. Working from a locked print-ready PDF keeps the page order predictable either way, which matters a lot when you are flipping a stack by hand.
It really does halve your paper
The math is simple and the saving is real. A twelve-month calendar printed one month per side needs just six sheets instead of twelve. Over a household that prints several calendars a year, that adds up fast, and a thinner stack is easier to bind and store too.
You can duplex any month from the monthly calendars collection. Pair January with February, March with April, and so on, so each sheet holds two consecutive months.
Watch for show-through
The one downside of double-sided printing is that ink from one side can be faintly visible on the other, especially on thin 20 lb copy paper with a dark or color-heavy design. On a busy calendar grid, that ghosting can make the page look cluttered.
Two fixes handle it. Print on slightly heavier stock, 28 to 32 lb (105 to 120 gsm) or more, which blocks most show-through, or print in grayscale with an ink-light layout so there is less coverage to bleed through in the first place. Give the first side a moment to dry before the second passes through.
Bind on the right edge
Before you print, decide how the finished calendar will turn, because it changes the flip setting. For a booklet you leaf through like a book, choose Flip on long edge so both sides read upright when you turn the page. For a tent or flip calendar that hangs and folds up over a bar, choose Flip on short edge so the back page is not upside down.
Getting this backwards is the classic duplex mistake, and the two-sided printing mistakes guide shows how to avoid it. Once the pages are printed, the booklet binding guide walks through turning the stack into a bound calendar.
Or keep one page per sheet
Double-sided is not always the better call. If you want to hang each month on the wall separately, or tear pages out as they pass, one month per sheet is simpler and there is no show-through to worry about. The paper saving only helps when the pages stay together as a booklet.
Weighing the two approaches for your setup is exactly what the one-page vs two-page spreads comparison is for.