Zakat on Gold by Karat: 24K, 22K, 18K Explained

Almost all gold jewellery and bullion is an alloy, not pure gold, and the karat or fineness stamp on a piece tells you exactly what fraction of it is actually gold for zakat purposes. Whether you own 24K bars, 22K Gulf-style jewellery, 18K Western jewellery, or a mix of all three, the zakat calculation is the same three-step process every time: work out the pure gold content, price it at today’s rate, and apply 2.5 percent once you clear nisab. The only real risk is getting the purity conversion wrong, which either overstates or understates what you owe.

What karat and fineness numbers actually mean

Pure gold is 24 karat, meaning 24 out of 24 parts are gold. Anything less than 24K is an alloy, usually mixed with silver, copper, or zinc to make the metal harder and more affordable, since pure 24K gold is very soft and impractical for everyday jewellery. Karat numbers translate directly into a fraction: 24K is 24/24 (100 percent pure), 22K is 22/24 (about 91.6 percent pure), 18K is 18/24 (75 percent pure), and 14K, common in Western and lower-cost jewellery, is 14/24 (about 58.3 percent pure). Many countries and jewellers instead stamp a fineness number in parts-per-thousand, which is simply the same fraction expressed differently: 999 or 999.9 marks correspond to 24K, 916 to 22K, 750 to 18K, and 585 to 14K. Both systems describe the identical underlying purity, so a “22K” ring and a “916” ring contain exactly the same proportion of actual gold.

Why purity matters for zakat

Zakat on gold is due on the actual gold content, not on the total weight of a piece including whatever alloy metal was mixed in. A 100-gram 18K necklace does not carry the same zakat liability as a 100-gram 22K necklace, because the 18K piece contains only 75 grams of actual gold while the 22K piece contains roughly 91.6 grams. Treating total weight as if it were all gold significantly overstates what is owed, especially for lower-karat pieces, while treating an unknown mixed-karat collection as pure gold without adjustment does the same in the other direction if you then apply too generous a price per gram. Getting the purity right is therefore not a minor technicality; it is usually the single biggest source of error in a jewellery zakat calculation.

The three-step calculation, explained

Step one: find the pure gold weight. Multiply the total weight of the piece by its purity fraction. A 50-gram 22K bracelet contains 50 × (22/24) = approximately 45.83 grams of pure gold. A 50-gram 18K bracelet contains 50 × (18/24) = 37.5 grams of pure gold. If a piece is stamped 916 instead of 22K, use 0.916 as the fraction directly: 50 × 0.916 = 45.8 grams, which is effectively the same answer allowing for rounding.

Step two: price the pure gold at today’s rate. Gold is quoted per gram (or per ounce, or per tola in South Asia) for 24K pure gold. Multiply your pure gold weight from step one by the current 24K price per gram. Using the 45.83 grams from the 22K example above, and assuming a hypothetical price of $75 per gram for 24K gold (this changes daily, so always check a live rate when you actually calculate), the market value works out to roughly $3,437. Never use the retail price you paid for the finished piece, since that includes making charges and markup that have nothing to do with the metal’s current worth; use only today’s pure-gold market rate applied to the pure-gold weight you calculated.

Step three: add to your other zakatable gold, silver and cash, compare to nisab, and pay 2.5 percent. Your gold does not sit in isolation; it is combined with any other gold, silver, cash and zakatable assets you hold. If the combined total clears the nisab threshold, you owe 2.5 percent of the entire combined value, not just 2.5 percent of the gold portion calculated in isolation.

A full worked example across mixed karats

Suppose someone owns three pieces: a 30-gram 24K gold bar, a 60-gram 22K bracelet, and a 40-gram 18K pendant, and no other zakatable assets. The 24K bar is already pure, so it contributes the full 30 grams of pure gold. The 22K bracelet contributes 60 × (22/24) = 55 grams of pure gold. The 18K pendant contributes 40 × (18/24) = 30 grams of pure gold. Adding these together gives 30 + 55 + 30 = 115 grams of pure gold equivalent. At a hypothetical $75 per gram for 24K gold, this comes to $8,625 in total zakatable value. Since gold’s nisab threshold (roughly 87.48 grams of pure gold) is comfortably cleared, zakat is due at 2.5 percent of $8,625, which comes to approximately $215.63.

Regional karat conventions worth knowing

Different regions favour different standard karats, which affects what you are likely to actually own. The Gulf, South Asia, and much of the Middle East favour 21K and 22K jewellery, valuing higher purity as both an investment and a status marker, and jewellers there almost always stamp pieces clearly with 21K, 22K, 916 or 875 marks. East Asian markets, especially China and parts of Southeast Asia, commonly deal in 24K bars and high-purity 999 or 999.9 jewellery meant to function almost like currency. Western markets, including the US, UK, and much of Europe, favour 18K and 14K jewellery because lower-purity gold is harder-wearing and cheaper, which suits everyday fashion jewellery rather than investment holdings. None of these regional habits change the underlying zakat rule; they simply mean the purity conversion step matters more or less depending on where you are and where your jewellery was bought.

When the stamp is missing, worn off, or unreliable

Older pieces, heavily worn jewellery, or gold bought informally sometimes carry no visible purity stamp, or a stamp that has worn smooth over years of use. In these cases, a jeweller can test the piece using an acid test, an electronic gold tester, or, for higher-value pieces, X-ray fluorescence (XRF) analysis, all of which give a reliable purity reading without damaging the item significantly. It is worth doing this once and keeping a written record of the result, since you will otherwise need to re-test or guess every single year at zakat time. When in real doubt and testing is not practical, many scholars advise erring toward assuming a higher purity (being more generous to the poor) rather than assuming a lower one, since underpaying zakat is the more serious risk.

Gemstones, clasps and non-gold components

Rings with gemstones, necklaces with pearls, and pieces with non-gold clasps or fittings should have those components’ weight excluded before applying the karat conversion. Most jewellers can tell you the gold-only weight separately from the total piece weight, particularly for higher-value items where a certificate or appraisal was issued at purchase. If you cannot get a separate weight, a reasonable estimate is to visually assess what fraction of the total weight is metal versus stone, though an actual jeweller’s assessment is always more reliable than a guess.

Converting between grams, ounces and tola

Gold is weighed in different units depending on where you live, and mixing them up is a quiet source of large errors. One troy ounce, the standard unit for international gold pricing, equals approximately 31.1035 grams. One tola, the standard unit across Pakistan, India, Bangladesh and much of South Asia, equals approximately 11.6638 grams (sometimes rounded to 11.66 or 11.664 grams depending on local convention). If you see a gold price quoted “per ounce” but your jewellery is weighed in grams on a local scale, or your zakat nisab is expressed in tola while your gold is priced per gram internationally, you must convert everything into one consistent unit before doing any karat or nisab math. A simple rule of thumb: to go from tola to grams, multiply by about 11.66; to go from grams to tola, divide by about 11.66; to go from ounces to grams, multiply by about 31.1; and to go from grams to ounces, divide by about 31.1. Getting this step wrong, even once, throws off every subsequent calculation regardless of how carefully you handle karat purity.

Investment bars and coins versus jewellery

Gold bars and coins sold specifically as investment products are almost always 24K (999 or 999.9 fine) precisely because investors want to hold value with no purity ambiguity and no wasted premium on decorative alloying. This makes the zakat calculation for bars and coins the simplest case of all: the stated weight is, for all practical purposes, the pure gold weight, so no karat conversion step is needed at all, only the current market price per gram or ounce. Some investment coins, particularly older historical minted coins, carry slightly lower purities such as 22K (a well-known example is certain sovereign-type coins), so it is still worth checking the specific coin or bar’s certified purity rather than assuming 24K by default. Jewellery, by contrast, is almost always alloyed below 24K for durability and cost reasons, which is why the purity conversion step matters so much more for jewellery holdings than for bar or coin holdings.

How a good zakat calculator should handle mixed karats

Because most people who own gold actually own several different pieces at different karats bought at different times, a zakat calculator that only accepts a single “total gold value in currency” figure forces you to do all the purity and pricing conversion work yourself, off to the side, before you can even use the tool, which is exactly where the most common calculation errors creep in. A better-designed calculator lets you add each piece separately with its own weight and karat or fineness mark, automatically converts each to pure-gold-equivalent weight, sums them, applies the current market price once, and only then compares the total to nisab and applies the 2.5 percent rate. This removes the manual conversion step entirely and is worth seeking out specifically if you own jewellery across more than one karat, which describes most people who have inherited pieces, bought jewellery in more than one country, or added to a collection gradually over many years at whatever karat was locally standard at the time.

Common mistakes people make with karat conversions

Using total piece weight as if it were pure gold weight. This is the single most common and most costly error; it inflates the zakat liability, sometimes drastically, for lower-karat pieces.

Confusing karat and fineness numbering systems. A “750” stamp is 18K, not 75K or some other value; always convert fineness numbers to a fraction out of 1,000, not out of 24.

Applying the wrong purity to gemstone-inclusive pieces. Karat marks describe the metal alloy’s purity, not the whole piece including stones, so the stone weight must be handled separately.

Using outdated purchase-price receipts instead of today’s market rate. Zakat is always calculated on current market value of the pure gold content, not on what you originally paid.

Forgetting to combine gold across multiple karats and pieces before comparing to nisab. Nisab is evaluated against your total pure-gold-equivalent holdings, not against each piece separately.

Do the four schools disagree on gold purity rules?

Unlike the debate over whether worn jewellery is zakatable at all, which genuinely divides the four schools, the mechanics of how to handle mixed-purity gold once it is established to be zakatable are not a point of significant disagreement. All four schools agree that only the actual gold content, not the total alloyed weight, is assessed.

Frequently asked questions

Why getting the purity conversion right matters

Because gold jewellery is one of the most commonly held zakatable assets worldwide, and because karat purity varies so widely between 24K bars, 22K Gulf jewellery, and 18K or 14K Western jewellery, the purity conversion step has an outsized effect on how much zakat many people actually owe each year. A calculator that lets you enter total weight and karat or fineness separately, rather than asking for a single “gold value” figure, removes almost all of this risk and ensures the amount you calculate reflects the actual gold content you own rather than an inflated or deflated estimate based on a misunderstood purity mark.

Sources: AAOIFI Shariah Standards on zakat calculation, classical fiqh on zakat on gold and silver, international gold purity and hallmarking conventions (karat and millesimal fineness systems), contemporary fatwa council guidance on jewellery valuation.