What is the amount of Zakat, is it fixed in all countries, and what is its percentage?

The threshold (nisab) for zakat to become obligatory on cash is approximately equal to 85 grams of pure gold, or approximately 595 grams of pure silver. If a person's cash holdings reach an amount that can purchase either of these quantities, zakat becomes obligatory on them, provided that one full lunar year has passed over this wealth without it falling below the nisab. The amount of zakat that must be paid is one-quarter of one-tenth (2.5%), meaning the wealth subject to zakat is divided by forty.