It’s always a good idea to know what size contacts you wear even if the size differences are usually minor.
The two factors you need to know in regards to the size of the contact lenses you buy are the curve and diameter.
Most contact lenses you buy will have a curve of around 8.6 and diameter of 15.0. This can range slightly though, and although the size difference will not normally make a huge difference in the comfort, it’s good to find out from a doctor or eye care specialist first to make sure everything will be okay.
The sizes that they sell pink contacts, and all other colored contact lenses will usually fit around 99% of people with no issues.