1 g, 5 g, 10 g or 1 oz gold bar: how to compare premiums

Small bars and ounce bars need different arithmetic. Compare fine gold, payment price, shipping and the same spot reference.

Buying a smaller bar can lower the amount of money needed for one item, while the price for each gram may be higher. To see the tradeoff, compare the premium per gram on a consistent basis. A product marked 1 g, 5 g, 10 g or one troy ounce is a different comparison group, even if its purity is similar.

Convert each bar to fine gold

Read the product specification for fine-gold weight and purity. One troy ounce is approximately 31.1035 grams. If the quoted weight is gross weight, multiply by the stated purity to estimate fine gold; use the mint or refiner specification when available. Never compare a one-ounce bar with a one-ounce coin merely because both show the same unit on a listing.

Calculate a per-gram cost

For each offer, multiply the unit price for your payment method by quantity, add shipping for the entire order, then divide by total fine grams. This gives a delivered subtotal per fine gram before tax. For example, a 5 g bar at an illustrative $350 plus $15 shipping costs $73 per fine gram. Two such bars at $350 each with the same $15 order shipping cost $71.50 per fine gram. These figures are arithmetic examples, not current offers.

Compare premium against one reference

Enter the same spot reference and observation time for every bar. Reference metal value equals spot dollars per troy ounce multiplied by fine grams divided by 31.1034768. Subtract that reference from the product and shipping subtotal; divide the difference by reference metal value for a percentage. The premium calculator handles the math using your own quote.

Check the item and checkout

Match condition, refiner or mint, assay packaging, year rule and stock. A low advertised unit price might depend on a higher quantity or ACH payment. Shipping can change the winner for one item. Tax is excluded from this site’s ranked subtotals, and a retailer can change terms before checkout. Browse the separate 1 g, 5 g, 10 g and 1 oz bar pages to see the matching rules and current coverage.

This guide explains comparison arithmetic and is not investment advice.

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