How to use the gold calculator

Original content · last updated 2026

This calculator converts any weight of gold into HKD at each major shop's bid / ask reference price in real time. Whether you want to estimate the value of jewellery you hold, plan to buy a gold bar, or compare which shop pays best when selling, you get an answer in seconds.

Steps

Pick a shop (Luk Fook, Yue Gong Ao Chow Sang Sang, Emperor, Chow Tai Fook, Chow Sang Sang, gold bar/pellet).
Enter a weight (e.g. 1, 5, 37.4).
Pick a unit: gram, tael, mace or troy oz.
Pick a product / purity (999.9 to 9K).
See "buy (you pay)" and "sell (you get)" reference prices instantly, plus an all-shops comparison and weight conversion.

How it is calculated

HKD reference price = weight (tael) × shop's per-tael quote × purity × (currency rate)
The per-tael quote is derived from international spot (XAU/USD) ÷ 31.1035 × 37.429 × USD-HKD rate, then adjusted by each shop's typical premium / buy-back discount.

International gold comes from gold-api.com and the USD-HKD rate from frankfurter.app, updated about every 60 seconds. Shop prices move with spot and are micro-adjusted by date, and are not any shop's official quote.

Hong Kong gold weight unit conversion

Unit	Equals grams	Note
1 troy ounce (oz)	31.1035 g	International quote unit
1 tael (HK troy tael)	37.429 g	The "tael" HK shops use
1 mace	3.7429 g	1 tael = 10 mace
1 candareen	0.374 g	1 mace = 10 candareens
1 gram	1 g	International standard

Buying vs selling — which price?

Buying (you pay) = the shop's ask price, higher, including labour premium.
Selling (you get) = the shop's bid price, lower. Before selling, use "all-shops comparison" and pick the highest bid.

Results are reference prices / estimates; shop prices are derived from international spot, are not any shop's official quote or actual dealing price, and are not investment advice. Confirm on site with the shop.