You don't have to be exact when selecting a size. We'll determine your exact size based on your artwork and update your price during proofing.
For example, when you order 3" x 3" custom stickers your exact size may be more like 3" x 2.8". When you receive your proof, you'll see the exact sizing and updated pricing. You can also request changes to your size during proofing until you're happy.
Here are a few common objects and their sizes for reference: