This all depends on your experience, body size and how comfortable you are with canopy control.
Listen to the recommendations of your chief instructor, canopy coach and other experienced respectable jumpers. In many countries your federation may have a set table for you to follow. You should be able to access the information on your country's federation website.
If you are purchasing your canopy from the manufacturer, get in touch with the sales team. More often than not, they are highly experienced skydivers that can give advice. Our Sales Team are all skydive instructors with many years in the sport.
It may seem conservative but they have done the research and work to ensure your safe canopy progression.
Our Buyer's Guide has a whole section on choosing the right size canopy. Head here to read more.
We also have a handy tool that can calculate what canopy should be your next purchase using jump numbers, currency & wingloading. Click the link to go to our Canopy Selector.