This will depend on two factors, the plant size and your current pot diameter size.
As a general guide:
Small size plants should be re-potted in a 4-5" diameter planter.
Medium size plants should be re-potted in a 6-8" diameter planter.
Large size plants should be re-potted in a 12-14" diameter planter.
Full size plants should be re-potted in a 14-16" diameter planter.
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