Planner Sticker Templates
Templates to allow you to design stickers for The Happy Planner, Erin Condron Planner, or more
Holly Wolf commented
Happy Planner boxes are 1.5" x 2.25", which reduces to a 2:3 aspect ratio. Any 4x6 card template will scale perfectly to fit them.
Erin Condren's squares are 1.5" x 1.875", which means a 4:5 aspect ratio. That's the same as a 4x5 or 8x10.