How long habits actually take (it's not 21 days)
The only real-world study on habit formation found a median of 66 days, with a range of 18 to 254. What that means for your tracker.
Blog
Notes on printable calendars, habit tracking, and planning on paper. Written by the people who design the calendars.
A4 vs A5 vs Letter: which size to print your calendar
Real dimensions, where each size belongs, and the one printer setting that ruins printable calendars. A decision guide in 500 words.