Gold, silver and bullion conversion
Precious Metals Weight Converter
Convert gold, silver, platinum, palladium or rhodium weight between grams, kilograms, milligrams, troy ounces, pennyweight, grains, avoirdupois ounces, pounds, tola and other common units.
Last Updated: July 21, 2026
- 12 weight units
- Troy and regular ounces separated
- No price data required
- Runs in your browser
Convert Precious Metal Weight
Enter a positive weight, then select the source and destination units.
Converted weight
1 troy ounce = 31.1034768 grams
| Common unit | Equivalent |
|---|
How to Use This Calculator
- Enter the metal weight. Decimals are accepted.
- Select the unit used on your scale, assay report, invoice or product listing.
- Select the unit you need.
- Choose a precision level or leave it on Automatic.
- Select Convert Weight. The summary table also shows common equivalents.
The converter changes weight only. Metal type and purity do not change the unit conversion. One troy ounce of gold weighs the same as one troy ounce of silver, but their values and pure-metal content can differ.
Precious Metals Weight Conversion Formula
The tool uses grams as a common base. It first converts your input to grams, then divides that gram value by the number of grams in the destination unit.
Worked example: 5 troy ounces to grams
One troy ounce equals exactly 31.1034768 grams. For 5 troy ounces:
The same 5 troy ounces also equal 100 pennyweight because one troy ounce contains 20 pennyweight.
Precious Metal Weight Conversion Table
| Unit | Symbol | Exact or defined gram equivalent | Typical use |
|---|---|---|---|
| Milligram | mg | 0.001 g | Small samples and assay work |
| Gram | g | 1 g | Jewelry, scrap and retail bullion |
| Kilogram | kg | 1,000 g | Large bars and wholesale lots |
| Troy ounce | ozt | 31.1034768 g | International precious-metal markets |
| Pennyweight | dwt | 1.55517384 g | Jewelry and scrap buying |
| Grain | gr | 0.06479891 g | Small bullion pieces and coins |
| Avoirdupois ounce | oz | 28.349523125 g | Ordinary household weight |
| Avoirdupois pound | lb | 453.59237 g | Bulk material and shipping |
| Tola | tola | 11.6638038 g | South Asian gold markets |
| Metric carat | ct | 0.2 g | Gemstones, not gold purity |
| Thai baht weight | baht | 15.244 g | Thai gold trade |
| Chinese tael | tael | 37.5 g | One modern mainland convention |
Important: Baht and tael are regional weight units. Market definitions can vary by place, product and trade convention. Confirm the unit standard printed by your dealer before settling a transaction.
Troy Ounce vs Regular Ounce
This is the most common precious-metal conversion mistake. A troy ounce is 31.1034768 grams. A regular avoirdupois ounce is 28.349523125 grams. The troy ounce is about 9.7% heavier.
- 1 troy ounce: 31.1034768 grams
- 1 regular ounce: 28.349523125 grams
- 1 troy pound: 12 troy ounces, or 373.2417216 grams
- 1 regular pound: 16 regular ounces, or 453.59237 grams
Gold, silver, platinum and palladium spot prices are commonly quoted per troy ounce. Shipping scales and household scales often show regular ounces. Check whether the label says “ozt” or “oz” before using a quoted metal price. UK government weights-and-measures guidance also identifies the troy ounce as the imperial unit permitted for precious-metal trade.
Common Units Used for Gold and Silver
Grams and kilograms
Grams are practical for jewelry, coins, small bars and scrap. Kilograms are common for larger bars and institutional quantities. One kilogram contains 1,000 grams and about 32.1507466 troy ounces.
Troy ounces
The troy ounce is the central market unit for precious metals. Many investment coins contain one troy ounce of fine metal, even when the coin's gross weight is slightly higher because it contains an alloy.
Pennyweight and grains
One pennyweight equals 24 grains, and 20 pennyweight equal one troy ounce. Jewelers and scrap buyers often use pennyweight. Grains help express small weights, but “grain” must not be confused with “gram.”
Tola
Tola remains familiar in India, Pakistan, Bangladesh, Nepal and nearby markets. A standardized tola equals 11.6638038 grams, so one troy ounce is about 2.6667 tola.
Weight, Purity and Fine Metal Content
A weight conversion does not calculate purity. Gross weight includes all material in an item. Fine metal weight counts only the target precious metal.
Example: a 10 gram piece marked 750 contains an estimated 7.5 grams of pure gold because 750 fineness represents 75% gold. Its gross weight remains 10 grams. Use the Metal Purity and Fineness Converter when you need to convert karat, percentage and millesimal fineness.
Stones, clasps, solder, springs, dirt and non-metal parts can affect an item's scale weight. A hallmark indicates a stated fineness, but it does not verify the current weight or authenticity. Use a calibrated scale and professional testing for high-value decisions.
Accuracy and Rounding
The calculator retains full conversion factors internally and rounds only the displayed result. Your practical accuracy still depends on the input measurement.
- A scale readable to 0.01 g should not be treated as if it measured to 0.000001 g.
- Use more displayed decimals for tiny samples or unit verification.
- Use fewer decimals for customer-facing estimates where the scale has limited resolution.
- Do not round each intermediate line in a multi-item inventory. Add using full precision, then round the final total.
- Recheck regional units such as baht and tael with the counterparty.
The result is a mathematical conversion, not a certified measurement. Legal-for-trade transactions can require approved and verified weighing equipment under local rules.
How to Choose the Right Weight Unit
Start with the unit shown on the original record. Converting a scale reading from memory creates avoidable errors. If a bar is stamped 100 g, enter 100 grams. If an assay statement reports 4.25 ozt, enter 4.25 troy ounces.
- For jewelry: grams and pennyweight are common. Remove or separately record stones and non-metal components when you need metal-only weight.
- For retail bullion: use grams, kilograms or troy ounces based on the product stamp. Do not assume a coin's gross weight equals its stated fine-metal content.
- For spot-price comparisons: troy ounces provide the simplest match when the market quote is per troy ounce.
- For South Asian transactions: tola and grams are widely recognized. Confirm whether the seller uses the standardized 11.6638038 gram tola.
- For scrap lots: keep the scale's original unit until you have recorded the reading. Convert a copy for pricing or reporting.
When a document says only “ounces,” ask whether it means troy ounces or regular ounces. A 100-ounce bar marketed in the precious-metals trade usually refers to troy ounces, but the abbreviation and product specification remain the better evidence.
Using Conversions for Metal Value Estimates
Weight and price must use the same unit. If your gold weighs 50 grams but your reference price is quoted per troy ounce, either convert the weight to troy ounces or convert the price to a per-gram rate. Do not multiply grams directly by a per-ounce price.
Suppose a fine-silver item weighs 250 grams and your price source quotes a value per troy ounce. The converter gives approximately 8.0376866 troy ounces. You would multiply that troy-ounce weight by the quoted price. If the item is sterling silver rather than fine silver, first account for its 92.5% purity. Dealer payout, tax, refining loss, assay charges and premiums are separate inputs and should not be mixed into the weight conversion.
A quoted “one-ounce” coin can also weigh more than one troy ounce in total when alloy metal is present. Read the issuer's specification for fine metal content, gross weight and purity. Use gross weight for shipping or physical inventory. Use fine metal weight for melt-value calculations.
Practical Checks Before You Record a Result
A clean workflow helps when you manage jewelry, coins, bars or scrap from several sources.
- Zero or tare the empty container before weighing loose items.
- Record the scale reading, unit and scale resolution together.
- Separate different metals and purity grades instead of combining them into one line.
- Convert each category using the same destination unit.
- Keep the original measurement beside the converted figure for audit and error checking.
- Apply purity only after the gross-weight conversion when you need fine metal content.
If a result looks wrong, check the ounce type first. Next, check whether a decimal separator, kilogram-to-gram step or regional unit definition was entered incorrectly. Swapping source and destination units is another frequent cause. The converter's Swap Units button lets you reverse the calculation and confirm that it returns to the starting value, subject to display rounding.
Related Metals Calculators
Frequently Asked Questions
How many grams are in one troy ounce?
One troy ounce equals exactly 31.1034768 grams.
Is a troy ounce the same as a regular ounce?
No. A troy ounce is 31.1034768 grams, while a regular avoirdupois ounce is 28.349523125 grams.
How many pennyweight are in a troy ounce?
There are exactly 20 pennyweight in one troy ounce. One pennyweight equals 24 grains.
How many troy ounces are in one kilogram?
One kilogram equals approximately 32.1507466 troy ounces.
How many grams are in one tola?
One standardized tola equals 11.6638038 grams.
Does metal purity affect weight conversion?
No. Unit conversion changes how the same gross weight is expressed. Purity is needed when calculating fine metal content or value.
What does ozt mean?
Ozt is a common abbreviation for troy ounce. It helps distinguish the precious-metal unit from the regular ounce abbreviation, oz.
Should I use grams or troy ounces for gold?
Use the unit shown by your scale, price quote or transaction document. Grams are common for jewelry and small bars. Market spot prices are often quoted per troy ounce.
Is a carat a weight or a purity unit?
A metric carat is a 0.2 gram weight unit mainly used for gemstones. Karat, spelled with a k in common US usage, describes gold purity.
Disclaimer: This calculator provides educational weight conversions. It does not verify scale accuracy, purity, authenticity, ownership, legal-for-trade compliance or market value. Confirm measurements and regional unit definitions with a qualified dealer, assayer or relevant authority before a transaction.