Gold Weight Calculator: Convert Grams, Ounces, dwt and More

Every Unit Gold Is Weighed In, Worldwide

Here is the full set you'll realistically encounter, anchored to grams — the unit every digital scale speaks and the one our gold calculator uses.

Two of these earn special respect. The troy ounce is the unit the entire gold market prices in — the US Mint strikes American Eagles to troy weight, and every spot quote you'll ever see means troy. And the pennyweight survives in American buying counters precisely because most sellers don't know it, which makes quotes harder to compare. Exactly one-twentieth of a troy ounce, it's covered in its own right below.

The Conversion Math, With Real Numbers

All conversions reduce to one move: get the weight into grams, then go wherever you need. Three conversions cover nearly every real situation.

Grams to troy ounces — divide by 31.103. A 50-gram chain is 50 ÷ 31.103 = 1.608 troy ounces. Going the other way, multiply: a quarter-ounce of gold is 0.25 × 31.103 = 7.776 g.

Pennyweight to grams — multiply by 1.555. A buyer who says your ring weighs "4 dwt" is saying 4 × 1.555 = 6.22 g. This conversion matters most in reverse: when a shop quotes "$110 per dwt for 14K," divide by 1.555 to get $70.74 per gram, the comparable number. (At gold near $4,400/oz, 14K melt is about $82.52/g — so that dwt quote is roughly 86% of melt. Good rate, deliberately awkward unit.)

Tola to grams — multiply by 11.664. Three tolas is 34.99 g. The tola is delightfully tidy: it's exactly 0.375 troy ounces, so 8 tolas equal exactly 3 troy ounces, a relationship South Asian bullion dealers use constantly.

For baht, multiply by 15.244; for Hong Kong tael, by 37.43; for grains, by 0.0648. Then run the grams through the gold price per gram calculator for a live dollar figure at any karat.

The Ounce That Isn't: A 9.6% Trap

One conversion deserves its own warning label. The English word "ounce" refers to two different weights, and gold uses the rarer one. The troy ounce is 31.103 grams. The standard (avoirdupois) ounce — the one your kitchen scale, bathroom scale, and postal scale mean — is 28.350 grams. The troy ounce is about 9.7% heavier.

The expensive mistake runs like this: you weigh a pile of gold on a kitchen scale, see "3.5 oz," multiply by the spot price, and believe you own 3.5 troy ounces of weight. You actually have 3.5 × 28.35 = 99.2 g, which is 99.2 ÷ 31.103 = 3.19 troy ounces. You've overestimated by nearly 10% before purity even enters the picture, and a buyer's fair offer will feel like a ripoff when it's nothing of the sort. The reverse error — reading a dealer's troy figure as kitchen ounces — makes sellers underestimate and accept lowballs.

The defense is to refuse to think in ounces of either kind during a valuation. Weigh in grams, calculate in grams, compare quotes in grams. We dissect the history and the full damage report in troy ounce vs ounce; the one-line version is that gold kept medieval French troy weights while groceries didn't, and the 2.75-gram gap between the two ounces has been quietly taxing the confused ever since.

Weighing It Right Takes Two Minutes

Conversion math is only as good as the weight you feed into a gold weight calculator, so a compressed field guide — the full version lives at how to weigh gold.

Use a digital pocket scale with 0.1 g resolution or better; adequate ones cost less than a dinner out. Put the scale on a hard, level surface, away from drafts and the edge of the counter. Tare it to zero with the empty tray, then weigh.

What you weigh matters as much as how. Sort items by karat first — a pile that mixes 10K and 22K has no single meaningful weight, because value is computed per karat. Remove anything that isn't gold: pendants from chains if they're different karats, watch movements from gold cases, cotton wadding from lockets. Gemstones are the big one — a 1-carat stone is only 0.2 g, but a chunky cocktail ring can carry several grams of stone, and buyers will deduct for it whether you did or not.

And typical weights, so you can sanity-check your scale's verdict:

If your scale says a delicate chain weighs 40 grams, weigh it again — something on the tray isn't gold, or the scale isn't on level ground.

Convert Once, Then Refuse to Convert Again

There's a bad habit that costs people money quietly: converting in a chain. Tolas to pennyweights because the buyer speaks dwt, pennyweights to troy ounces because the price is quoted per ounce, troy ounces back to grams because that's what the scale said. Every hop rounds, and rounding compounds in one direction as often as it cancels out.

Watch it happen. Three tolas is exactly 3 × 11.664 = 34.992 g. Now do it the sloppy way: call a tola 11.66 g (34.98 g), divide by a rounded 1.55 to get 22.57 dwt, divide by 20 for 1.1285 troy ounces, multiply by a rounded 31.1 and land on 35.09 g. You've drifted 0.10 g — about 0.3% — on a piece of jewelry. At 22K purity and $4,400/oz gold, 22K runs $129.68 a gram, so that drift is roughly $13. Annoying, not fatal.

Now run the same sloppiness across a 500-gram estate lot. The same 0.3% is 1.5 g, or about $195 of 22K gold, sitting entirely on the wrong side of the ledger — and nobody in the room will ever know which conversion caused it.

The fix is a rule, not more care: convert everything into grams once, write the grams down, and never leave grams again. Put the number in a note on your phone with the karat next to it. When a buyer quotes per pennyweight, don't convert your weight to pennyweights — convert their price to a per-gram figure by dividing by 1.555, and compare in your own units. You control your arithmetic; you do not control theirs.

Worked Example: Four Tolas of 22K, Converted to US Dollars

Now the situation a gold weight calculator exists for. Say your aunt in Karachi left you a pair of 22K bangles, and the family knows them the way South Asian families always have: "four tolas, two tolas each." What is that in American money?

Step 1 — tolas to grams. 4 tolas × 11.664 g = 46.656 g of 22K gold. Confirm it on your own scale; heirloom weights are sometimes remembered generously, and clasped-in screws or lac filling (a resin core used in some bangle styles) can mean less gold than the family figure suggests.

Step 2 — adjust for purity. 22K is 91.67% gold — the standard for South Asian jewelry, often hallmarked 916. Pure gold content: 46.656 × 0.9167 = 42.77 g.

Step 3 — apply the gold price. Assume gold at $4,400 per troy ounce, which is $4,400 ÷ 31.103 = $141.47 per gram. Melt value: 42.77 × $141.47 ≈ $6,051.

Step 4 — translate to real offers. An online refiner paying 70–90% of melt would offer roughly $4,236–$5,446. A local jewelry buyer at 50–75% would land between $3,026 and $4,538. One genuine bright spot: in US cities with significant South Asian communities, specialist 22K jewelers sometimes pay near the top of the range or resell intact pieces rather than melting them — handmade bangles can be worth more as bangles than as metal. Get one quote from that world before anyone fires up a torch.

The Weight on the Scale Is Not the Weight of the Gold

Every conversion on this page assumes the number you started with is gold. Frequently it isn't — not because anyone lied, but because jewelry is an assembly. What a scale reports is gross weight. What a buyer pays for is net gold weight, and the difference can be most of the object.

The usual offenders, roughly in order of how much they matter:

• Movements and mechanical parts. A gold-cased quartz watch is mostly not gold. Say the whole watch reads 62 g; strip the movement, crystal, steel back, and pins and the 18K case itself is 38 g. At $4,400/oz gold — $106.10 per gram for 18K — the case melts at 38 × $106.10 = $4,031.80, while the 62 g figure would have suggested over $6,500. Sell a working watch whole rather than scrapping it, but if it's scrap-bound, know which number is real.
• Fillers. Traditional South Asian bangles and some hollow Italian work are packed with lac, resin, or cement to hold shape. A 46 g pair of bangles can hide 15 g of filler, and a buyer will drill or cut to check.
• Springs, clasps, and pins. Steel spring bars in a bracelet clasp, base-metal ear posts, and pin stems are small individually and add up across a lot.
• Stones. Usually the smallest deduction, contrary to expectation. A carat is 0.2 g, so a 14K cocktail ring reading 14.8 g gross with 3.1 carats of stones is carrying just 0.62 g of them. Net 14.18 g × $82.52 = $1,170.13, against $1,221.30 if you'd priced the gross weight — about $51 of difference. Real, but not the thing to worry about first.

So the honest procedure is: weigh gross, identify the non-gold, estimate or remove it, and convert only the remainder. When you can't tell — an unopenable locket, a bangle you'd rather not damage — say so up front and ask the buyer how they intend to establish net weight. The answer to that question tells you a great deal about who you're dealing with, and the FTC's guidance on selling gold jewelry is worth a read before you hand anything over.

Frequently Asked Questions