Gold Price Converter

What each variable means:

• 31.1035 — the number of grams in one troy ounce (31.1035 g), the standard unit the world market uses to quote the gold price.
• Grams per baht-weight — Thai gold bars use 15.244 g per baht-weight. Gold ornaments (jewelry) use 15.16 g per baht-weight, which accounts for making charges and the metal setting.
• 0.965 — the standard purity of Thai gold bars, 96.5% gold (Thai standard), lower than the 99.9% gold (international spot reference) the world market uses for spot pricing.
• USD/THB rate — the exchange rate between the US dollar and the Thai baht (THB) at the time.

Example: with a spot price of $2,400/oz, a USD/THB rate of 32.66, and gold bars, Factor = (15.244 ÷ 31.1035) × 0.965 ≈ 0.472952. The price per baht-weight = 2,400 × 0.472952 × 32.66 ≈ 37,072 THB. For every $1 the spot price moves, the gold-bar price per baht-weight moves by about 15.45 THB.

What is the Thai gold premium, and where does it come from?

The premium is the gap between the gold-bar price a Thai gold shop posts and the price you get straight from spot times the exchange rate. Several factors drive that gap: the real cost of importing and exporting gold, shop fees and margin, domestic buy-and-sell demand at that moment, and how liquid the local gold-bar market is. This tool shows how far the price from the Gold Traders Association (GTA), Thailand's gold-trade body, sits above or below the theoretical price, so you can factor that into a trade decision. It doesn't say which price is right or wrong.

15.244 g vs. 15.16 g: how is Thai gold weight different?

Gold bars in Thailand use 15.244 g of pure gold per baht-weight, the weight set by the GTA standard. Gold ornaments, such as necklaces, rings, and bracelets, are usually priced at 15.16 g per baht-weight, because manufacturing labor and some metal loss during production are deducted from that weight. That makes the ornament price per baht-weight a little lower than the bar price when both are calculated from the same spot price, and shops typically deduct an extra making charge when they buy ornaments back from you.

Why 31.1035 g and 96.5%?

31.1035 g is the international standard size of one troy ounce, the unit every world gold market uses to quote the spot price in USD per ounce. 96.5% is the standard purity the GTA sets as the main trading benchmark for gold bars in Thailand, while the world market references 99.9% gold. Converting between these two standards always requires multiplying by the purity ratio, or the resulting price would come out roughly 3.5% too high.