Precious Metal Weight Converter

Precious metal weight conversion is the process of converting between different units used to measure gold, silver, platinum, and other precious metals. Precious metals use a unique set of weight units distinct from everyday measurements, primarily because of historical traditions in the jewelry and bullion industries. The most important distinction is between the troy system (used for precious metals) and the avoirdupois system (used for everyday items like groceries and produce).

The troy ounce (oz t) is the international standard for pricing and trading precious metals. Gold, silver, and platinum are quoted in troy ounces on commodity exchanges worldwide. One troy ounce equals exactly 31.1035 grams, which is about 10% heavier than the avoirdupois ounce (28.3495 g). This difference is critical — confusing the two can lead to significant errors in valuation and trading.

The pennyweight (dwt) is traditionally used by jewelers, with 20 pennyweights making one troy ounce. The tola is the standard gold measurement in India (1 tola = 11.664 g), while the tael is used in East Asia (Hong Kong tael = 37.429 g, Chinese tael = 50 g). The baht is the Thai gold weight unit (1 baht = 15.244 g), and the mesghal is used in Iran (1 mesghal = 4.6875 g). The grain (1 grain = 0.0648 g) is an ancient unit still used in some jewelry contexts.

This calculator supports 14 different precious metal weight units, covering both Western and international systems. It converts between troy ounces, grams, kilograms, pennyweights, grains, avoirdupois ounces and pounds, troy pounds, and regional units (tael, tola, baht, chi, mesghal). Whether you are a jeweler, investor, or trader, accurate weight conversion is essential for fair pricing and transactions.

All conversions in this calculator work through grams as the intermediate unit. Each source unit is converted to grams using its exact conversion factor, and then grams are converted to the target unit.

The key conversion factors to grams are: 1 troy oz = 31.1035 g, 1 gram = 1 g, 1 kg = 1000 g, 1 pennyweight = 1.5552 g, 1 grain = 0.0648 g, 1 avoirdupois oz = 28.3495 g, 1 avoirdupois lb = 453.592 g, 1 troy lb = 373.242 g, 1 tael (HK) = 37.429 g, 1 tael (Chinese) = 50 g, 1 tola = 11.664 g, 1 baht = 15.244 g, 1 chi = 3.75 g, and 1 mesghal = 4.6875 g.

The conversion method is: result_grams = input_value × source_factor_to_grams, then result = result_grams / target_factor_to_grams. This two-step approach ensures accuracy regardless of which two units are being converted.

Important distinction: the troy pound (373.242 g = 12 troy ounces) is different from the avoirdupois pound (453.592 g = 16 avoirdupois ounces). The troy system has 12 ounces per pound, while the avoirdupois system has 16. This means a troy pound is actually lighter than an avoirdupois pound, despite having fewer ounces per pound.

This calculator supports 14 precious metal weight units with comprehensive conversion capabilities:

1. Enter the Value: Type the numerical value of the weight you want to convert.
2. Select the From Unit: Choose the source weight unit from the dropdown (e.g., troy ounce, gram, tola).
3. Select the To Unit: Choose the target weight unit from the second dropdown.
4. View the Result: The main display shows the converted value with both source and target unit labels.
5. Review All Conversions: The "All Conversions" panel shows your input value expressed in all 14 supported units, providing a complete reference for comparison and cross-checking.

The calculator also provides reference sections explaining each unit system, including the important distinction between troy and avoirdupois systems.

The converter displays your input value expressed in all 14 supported precious metal weight units. The primary unit for precious metal pricing is the troy ounce (oz t), which is used by commodity exchanges and bullion dealers worldwide. Grams and kilograms are the standard metric units, used widely in international trade and scientific contexts.

The pennyweight is important for jewelers, who often price and weigh small quantities of precious metals in dwt. The regional units (tola, tael, baht, chi, mesghal) are essential for markets in Asia, where gold trading traditions differ from Western practices. The avoirdupois units (oz, lb) are included because they appear in some US contexts, though they should not be used for precious metal pricing.

The troy vs. avoirdupois distinction is critical: 1 troy ounce (31.1035 g) is about 10% heavier than 1 avoirdupois ounce (28.3495 g). When buying gold or silver, always verify that the weight is specified in troy ounces, not regular ounces. A gold bar labeled "1 oz" should always mean 1 troy ounce (31.1 g), not 1 avoirdupois ounce (28.3 g).

Precious metal weight conversion is essential in gold and silver trading. International commodity markets (COMEX, LBMA, MCX) quote precious metals in US dollars per troy ounce. A gold price of $2,000 per troy ounce means gold costs approximately $64.31 per gram. Investors and traders must convert between troy ounces and grams to calculate the value of their holdings and compare prices across different dealers and markets.

In the jewelry industry, precious metals are weighed in different units depending on the region and tradition. Western jewelers typically use pennyweights (dwt) and troy ounces, while Indian jewelers use tolas, Chinese jewelers use taels (liang), and Thai jewelers use baht. When sourcing gold internationally, accurate conversion between these regional units is essential for fair pricing and transparent transactions.

Bullion investors need to understand weight conversions to compare products across different standards. Gold bars are available in various sizes: 1 troy oz (31.1 g), 10 troy oz (311 g), 1 kilogram (32.15 troy oz), and other quantities. Silver is commonly sold by the troy ounce but may also be priced per pound or per kilogram in different markets. Accurate conversion ensures investors pay fair prices and understand what they are purchasing.

In precious metal recycling and refining, scrap gold, silver, and platinum are weighed and valued based on weight and purity. Refiners buy scrap in various units (grams, pennyweights, troy ounces) and must convert accurately to determine fair buy-back prices. The karat purity system (24K = pure gold, 18K = 75% gold) combines with weight to determine the actual precious metal content and value.