If you are ever looking for a seed bead size chart this one very useful.
Rather than a list of sizes this chart represents each size visually so you can see at a glance what is what.
If you print it out and keep it handy you will be able to substitute beads in a pattern. It also supplies a few notes on how many of a particular size bead is required to cover an inch which helps you plan your own designs. There is also a Millimetre/ Inch guide all on the one page!
I printed out two copies. One was pasted to the inside cover of my studio journal and the other was pinned on the board in front of my desk.