Monthly habit tracker
Thirty-one numbered columns across, your habits down the left, one page per month.
Opens with these settings already loaded. Change anything you like, then download as PDF, PNG or SVG.
Why a month is the right window
A week is too short to show a pattern and a year is too long to face. A month fits on one page at a readable size, covers enough days that a gap is visible as a gap rather than a bad day, and ends often enough that a poor month can be abandoned without abandoning the habit. Thirty-one columns covers the longest month, and you simply leave the surplus blank in shorter ones.
Track few things, and track actions
The common failure is a tracker with fourteen rows, which becomes an accusation by the middle of the second week. Three to five habits is the working number. Prefer things you either did or did not do, since "exercised" is markable and "was productive" is a judgment you will argue with yourself about at eleven at night. If a habit needs a number rather than a mark, give it a row and write the number in the box.
Put it where you already look
A tracker in a drawer is a tracker you fill in from memory on the 28th, which records your memory rather than your behavior. Inside a notebook cover, on the fridge, beside the coffee machine. If you keep a bullet journal, print it at A5 and tuck it against the current spread. The point of the grid is that a missed day is visible at a glance, and that only works if the sheet is somewhere your glance lands.
Printing it accurately
This only measures correctly if your printer doesn't rescale the page. In the print dialog set Scale: 100%, not "Fit to page" or "Shrink oversized pages". If you're not sure it worked, print the calibration page, measure the ruler on it with a real ruler, and it will tell you exactly what your printer is doing to the page.