I don’t earn but I have some savings in cash (not much). How much is the minimum amount of cash (in riyals) that I must have so that I become eligible for paying zakah of that particular amount?
You must give your zakat on your savings if they are equivalent or beyond the value of 595 gms of silver.
THRESHOLD FOR ZAKAT:
The threshold (nisab) of money is the value of 595 grams of silver which is about 300$. You try and set a date and on that day, you calculate how much you have and give 2.5% in zakat. Every lunar year, you do this process on that date.