Weight tool
Gold weight converter: grams, ounces, tola, and baht
Convert common gold weights and understand troy ounces, tola, pennyweight, and baht before comparing a gold price.
Independent editorial reference · verify market data and local rules before a transaction.
Updated August 29, 2026
Gold is traded and described with grams, troy ounces, tola, pennyweight, and regional units such as the Thai baht weight. A conversion is only useful when the unit convention is named and the result is not mistaken for a purity test. This guide explains the unit layer before you use a price per gram or karat calculator.
Troy ounce is not a household ounce
Precious metals use the troy ounce, which is approximately 31.1035 grams. The avoirdupois ounce used for many everyday goods is lighter, so substituting it in a gold calculation creates a material error. Gold Calculate uses 31.1 grams per troy ounce for consistent public display. When importing a quote from another source, check its denominator before comparing decimals.
The safest workflow is to convert every input to grams, label the original unit, and preserve the conversion factor in your notes. This makes a result auditable. It also prevents a familiar number such as “one ounce” from hiding a different measurement system.
Common conventions used by the calculator
For the calculator’s displayed options, one troy ounce is 31.1 grams, one tola is 11.664 grams, one pennyweight is approximately 1.555 grams, and one Thai baht weight is approximately 15.244 grams. Kilograms are 1,000 grams. These are practical comparison conventions, not a claim that every regional seller uses identical rounding.
Traditional units deserve extra care. A listing may use a local historical convention, a marketplace may round for advertising, and a counterparty may quote a weight without saying whether it is gross or net. Ask the seller to write the gram equivalent. If its convention differs, use the stated local factor rather than silently changing the input.
A conversion example
Suppose a listing says 2 tola. Using the site convention, the mass is 2 × 11.664, or 23.328 grams. If the documented metal is 22K, the weight remains 23.328 grams; purity is applied later when estimating fine-gold content. If another listing says 0.75 troy ounce, convert with 0.75 × 31.1, or about 23.325 grams. Those results are close because the examples were chosen to illustrate the method.
Once the grams are known, multiply by the chosen per-gram reference and the purity fraction. Keep the displayed rounding separate from the underlying input. A converter should show how a number was obtained, not create a false sense that a scale, stamp, or source quote has been independently verified.
Gross weight, net gold weight, and fine content
A kitchen scale usually measures the whole object. A jewellery invoice may contain gold, stones, enamel, springs, clasps, solder, and other materials. A bullion package may include wrapping or a certificate that is not part of the metal. Ask which mass the quote uses and whether a professional test is needed before assigning fine-gold value.
Fineness converts mass into approximate fine-gold content. For example, 20 grams at 75 percent contains a simplified 15 grams of fine-gold equivalent before any market or assay adjustment. That does not mean the object can be sold for the value of 15 grams at spot; a buyer still applies its bid, testing, and operating terms.
Regional questions before accepting a converted quote
Ask whether the quote is per troy ounce, per gram, per tola, per ten grams, or a regional weight. Confirm the currency, purity, timestamp, and whether the amount is a public selling price or a buy-back bid. A unit conversion can make two prices comparable, but it cannot make two commercial products equivalent.
For India, compare tola and ten-gram discussions only after converting both to grams and matching 22K or 24K purity. For Dubai, confirm whether the AED rate is a metal board rate or a jewellery invoice with making and VAT. For Thailand or other markets using local units, request the seller’s written factor instead of relying on a generic internet table.
Using a scale and keeping an audit trail
Use a suitable, calibrated scale for an initial check and record its resolution. A home reading is not the same as a jeweller’s certified measurement, particularly for very light pieces or objects with moving parts. Photograph the item, stamp, and invoice, but do not treat a photograph as proof of purity.
Keep the original unit, conversion factor, resulting grams, purity assumption, price source, and timestamp together. If a counterparty produces a different total, you can identify whether the disagreement comes from mass, fineness, currency, timing, or a commercial charge. This simple record is more useful than a rounded headline.
What the converter can and cannot establish
Gold Calculate’s converter answers a mathematical question: how much mass does one convention represent in another? The calculator can then apply a source-labelled price and selected karat, but it cannot assay the item, subtract hidden non-gold components, value a collectible design, or determine a fair dealer spread.
The unit conventions are documented to make the tool reproducible. LBMA and World Gold Council material can help with broader market language, while local hallmark and tax authorities govern a transaction. Check the current source and seller terms, and contact the publishing desk if a conversion factor or explanation needs correction.