If using celery for karpas (כרפס), the minimum shiur (שיעור) is:
- Less than a kezayis (כזית) – meaning less than approximately 1oz (28g) in volume.
- A small piece is sufficient—many hold that even a bite-sized amount fulfills the requirement.
For practical purposes, a short celery stalk (גבעול קטן של סלרי) or a small piece of the stalk is typically used. Since the mitzvah is about dipping and not about eating a specific quantity, there is no strict minimum shiur like there is for maror (מרור).
This is just a guideline—consult your Rav for specific guidance.
