How to Calculate Zakah on Cash
Question

I have 10,000 Riyals and one full Hijri year has passed since I acquired it. How much is the Zakah that I must pay for it?
Praise be to Allah.What must be given as Zakah on cash is one quarter of one tenth (2.5%) , or 25 out of every thousand.
The way to work out the Zakah on cash is to give 25 Riyals for every thousand. So if you have ten thousand, the Zakah is 250 Riyals.
You can divide the amount (that has reached the Nisab , i.e., the minimum threshold at which Zakah becomes due) by forty, and whatever results from that division is the amount of Zakah that must be paid.
Based on that, if you divide 10,000 Riyals by 40, the result will be 250 Riyals. This is the amount of Zakah for that amount [of cash] .
For more, see these answers: 26113 , 231858 , 50801 , 93414 , and 64 .
And Allah knows best.