Gold in every form
Gold is zakatable whether it is jewellery, coins or bars. You do not work out zakat on gold on its own: add its value to your cash, silver and other assets, take off deductible debts, and compare the total with the nisab.
A local jeweller can tell you what your pieces are worth if you are unsure of their weight or value.
Jewellery you wear
The National Zakat Foundation sets out the difference between the schools. The Hanafi school counts all gold and silver jewellery, whether it is worn or stored, at its resale value. The other schools do not count gold and silver jewellery worn for personal use.
Jewellery kept as savings, or held to sell, is counted. If you are unsure which applies to you, ask a scholar you trust.
Weighing it up
Enter gold in grams, tola or troy ounces. One tola is 11.6638 g and one troy ounce is 31.1035 g. The calculator multiplies the weight by the price per gram, which you can change if your jeweller quotes a different price.
The gold nisab
If you use the gold standard, the nisab is the value of 87.48 g of gold (National Zakat Foundation) or about 85 g (Zaytuna College). Most people's wealth crosses the silver nisab long before the gold one, which is why Zaytuna College calls silver the safer choice.