If you are wanting to stretch your ears, you should know the sizes of all the different gauges.
Here is a beautiful chart I have made for you. This chart is about as accurate as you will get.

Hope this comes in handy for you.
What size are you up to? Let me know in the comments.
This is really helpful. I have piercings, but they’re very basic ear-and-nose one. Nothing too ‘expanding’. Whenever I ask people about how they stretch to their levels, they don’t usually give me a coherent answer. This could be due to external factors, like the noise levels when I’m asking them, or possibly their levels of intoxication – I don’t know! – but it’s really cool to see this concept spelled out in such a clear way. Thanks you.
Cheers Mark!
I’m glad you found my info useful. That’s what I was hoping for.
Hannah.