Bullion premium calculator: price over spot
Enter a dealer price and pure metal content to calculate the true premium over live spot—including quantity, shipping, and tax.
The premium over spot is simple once every price is on a per-ounce basis. The formula:
premium % = (price per troy oz − spot) ÷ spot × 100
In one sentence: subtract spot from the all-in price per troy ounce, divide by spot, and multiply by 100. Include shipping, tax, quantity, and the product's actual pure-metal weight when you want the real checkout premium.
Today's observed premium ranges
These are original StackerSpot observations on the cash/check/wire basis—not generic rules of thumb. Low, median, and high describe the current tracked dealer field; the 7- and 30-day figures show how the cheapest observed premium moved. History uses every valid daily snapshot available, up to the stated window.
Observed 2026-09-11; dealer count is distinct dealers in that category. Prices and policies can change before checkout.
Premium over spot calculator
Enter the dealer price and the item's pure metal content. The latest StackerSpot spot snapshot is prefilled when available; add shipping and tax to see the true all-in premium.
The only trick is converting the item to a per-troy-ounce price first — because a 1/10 oz coin, a 1 oz round, and a 100 gram bar can't be compared until they're on the same scale. Here's the four-step method, then worked examples for coins, fractional pieces, and grams.
The four steps
- 1. Get the current spot price per troy ounce for the metal.
- 2. Convert the item to a price per troy ounce: divide the total price by the item's weight in troy ounces. (For grams, divide by grams, then multiply by 31.1035.)
- 3. Dollar premium = price per oz − spot.
- 4. Percentage premium = dollar premium ÷ spot × 100.
Worked examples
A 1 oz gold coin. Spot $4,000. Coin price $4,180.
- Per oz = $4,180 ÷ 1 = $4,180.
- Dollar premium = $4,180 − $4,000 = $180.
- Percentage = 180 ÷ 4,000 × 100 = 4.5% over spot.
A 1/10 oz gold coin. Spot $4,000. Coin price $460.
- Per oz = $460 ÷ 0.1 = $4,600.
- Dollar premium = $4,600 − $4,000 = $600 per ounce.
- Percentage = 600 ÷ 4,000 × 100 = 15% over spot — the small piece is far pricier per ounce, even though its sticker looks cheap.
A 100 gram silver bar. Spot $30/oz. Bar price $110.
- Weight in troy oz = 100 ÷ 31.1035 = 3.215 oz.
- Per oz = $110 ÷ 3.215 = $34.22.
- Percentage = (34.22 − 30) ÷ 30 × 100 = 14% over spot.
That per-ounce step is the whole game: it's why a “cheap” fractional coin can be the most expensive silver or gold you can buy, and why bars priced in grams need a quick conversion before you judge them.
See it computed live
StackerSpot runs this math on every listing automatically and normalizes each to a per-troy-ounce basis, so the premiums are directly comparable across forms and weights:
A couple of gotchas
- Pack pricing. A tube or box price is for the whole lot — divide by the count and the unit weight before you compute a per-ounce number.
- Cash vs card. Decide which price basis you're using and stay consistent; card typically runs a few percent above the advertised cash/wire figure.
- Spot moves. Premium is only meaningful against a current spot price — a stale spot makes the percentage wrong.
Skip the math — see live premiums
Every product normalized per ounce and ranked by premium over spot.
Common questions
How do I convert grams to troy ounces?
One troy ounce is 31.1035 grams. To get a per-troy-ounce price, divide the item's price by its weight in grams, then multiply by 31.1035. For example, a 20 g bar at $2,600 is $130/g × 31.1035 = about $4,043 per troy ounce.
What's the difference between the dollar premium and the percentage premium?
The dollar premium is how many dollars over spot you pay per ounce; the percentage premium expresses that as a share of spot. Percentage is what makes different products comparable — a $150 premium is small on a $4,000 ounce of gold (about 3.8%) but enormous on a $30 ounce of silver.
Does StackerSpot calculate the premium for me?
Yes. StackerSpot converts every dealer listing to a per-troy-ounce basis and calculates each point-in-time premium from dealer and spot prices captured together, so you can compare a 1/10 oz coin, a 1 oz round, and a 100 g bar on the same scale without doing the math yourself.
Should I use the cash price or the card price when I calculate?
Be consistent and know which basis you're using. Most dealers advertise the cash/wire price; paying by credit card typically adds a few percent. StackerSpot uses the cash/wire basis, so compare like with like — and add the card surcharge if that's how you'll pay.
Methodology & sources
StackerSpot computes each premium on a per-troy-ounce, cash/wire basis using the spot quote captured with its dealer price — the same math shown here — detailed in our methodology. One troy ounce = 31.1035 grams (standard market convention). Worked examples use round hypothetical numbers. Next, read how much over spot you should pay.
Informational purposes only — not investment, financial, or tax advice, and not a licensed dealer or advisor. Prices are each dealer's cash/wire figure, change constantly, and may differ from the dealer's own site; always confirm before buying. See our editorial process, methodology & disclaimer.