What it does
Precious metal is weighed in many units: grams on a jeweller’s scale, troy ounces on the price screen, tola in India and the Gulf, grains and pennyweight on old coin specifications. This tool takes a weight in any of them and shows it in all the others at once.
It is built for gold, silver, platinum and coins, so it includes the troy ounce (not the ordinary ounce your kitchen scale uses) and the traditional units, with a one-line note on where each is used. Once you have a weight in grams, work out the metal inside it with gold purity and its value with melt value.
How to use it
- Type the amount.
- Choose the unit it is in.
- Read the table: every unit is filled in, and the unit you chose is bold.
What each setting does
- Amount: the weight you have. Decimals are fine.
- Unit: gram, kilogram, troy ounce, ounce, grain, pennyweight, tola, masha, ratti, sovereign (pavan), baht or tael.
Worked example
1 tola is 11.6638 g. That is 0.375 troy ounces and 180 grains, because a tola is defined as 180 grains. The same weight is 12 mashas or 96 rattis. And 10 g of silver is 0.3215 troy ounces, which is why a 10 g bar costs less than a third of a troy-ounce price.
FAQs
What is the difference between a troy ounce and an ounce? A troy ounce is 31.1035 g and is used for precious metals. A normal (avoirdupois) ounce is 28.35 g. Prices of gold and silver are always per troy ounce.
Is a tola always 11.6638 g? In modern use, yes: it was fixed as 180 grains. Some older shops and regions used slightly different values, so check the weight stamped on the bar.
Why is a pavan 8 grams? In South Indian gold jewellery a pavan (sovereign) is counted as 8 g, so a price per pavan is simply 8 times the price per gram. It is not the same as the British gold sovereign coin.
Does my scale matter? Yes. Use a scale that reads to 0.01 g for coins and jewellery. For checking the pure gold in a piece, see bullion premium to compare what you pay across products.
Is anything sent anywhere? No. It all runs in your browser and works offline once the page has loaded.
Where the numbers come from
- Troy ounce = 31.1034768 g, grain = 0.06479891 g, pennyweight = 24 grains and avoirdupois ounce = 28.349523125 g (exact by definition).
- Tola = 180 grains = 11.6638038 g; masha = 1/12 tola; ratti = 1/8 masha (traditional South Asian units). Sovereign (pavan) taken as 8 g of gold in South Indian jewellery. Hong Kong tael and Thai baht are the trade weights in common use; check your dealer's figure.
Standard scientific values, such as constants, atomic weights and melting points, are facts found in every textbook; we name where ours were checked. If you are an author or publisher and want a value, a credit or a table changed or removed, tell us and we will act quickly.
Last updated 2026-11-10.