A Kilo Bar in Grams, and in the Units the Trade Quotes
Bullion lives awkwardly between two measuring systems. The bar in the safe is metric — a kilo, a hundred grams, a fifty — while the price feed on the screen is quoted per troy ounce, the refiner's assay card talks fineness, and the local scrap buyer may still work in pennyweight or tola. Turning kilograms into grams is the easy half; the useful half is seeing that same mass expressed in every unit a counterparty might use.
What Else Is Written on the Bar
Retail bar sizes are metric
Gross mass and fine content differ
The stamped weight is the traded weight
Mass and volume travel together
Checking a Holding Across Metric and Troy Units
The routine is the same whether you are pricing one bar or totalling a drawer of them.
Enter the kilogram figure
Type 1, 0.5 or 0.25 in the left field and the gram value appears as you type. A comma serves as the decimal separator and spaces used for grouping are ignored, so a pasted "1 000" still parses.
Change the right unit to troy ounce or pennyweight
Search the right-hand dropdown for troy ounce and 1 kg resolves to 32.15074657 oz t; pick pennyweight instead and the same bar is 643.01493 dwt. Tola and grain sit in the same list.
Copy the figure into your holdings sheet
The copy button places the bare number on the clipboard, without unit or thousands spacing, ready for a spreadsheet column that already sums grams. Ctrl + C inside a field does the same.
Reverse it to total a stack of small bars
Twelve 100 g bars come to 1 200 g. Press the swap button (↔) to run g → kg and read that back as 1.2 kg, the figure a storage or shipping form will want.
Bar and Coin Formats in Grams and Troy Ounces
The sizes a dealer's price list is built from, with each one expressed in the unit the spot market quotes.
| Format | Grams | Troy ounces (oz t) | Note |
|---|---|---|---|
| 1 g bar | 1 g | 0.03215075 oz t | Smallest widely minted size |
| 5 g bar | 5 g | 0.16075373 oz t | Common gift and starter size |
| 20 g bar | 20 g | 0.64301493 oz t | Just under two thirds of an ounce |
| 1 troy ounce coin or bar | 31.1034768 g | 1 oz t | The unit spot prices are quoted in |
| 100 g bar | 100 g | 3.21507466 oz t | The usual step above the ounce |
| 250 g bar | 250 g | 8.03768664 oz t | A quarter of a kilo bar |
| 1 kg bar | 1 000 g | 32.15074657 oz t | The standard investment bar |
Read down the troy-ounce column and the problem is plain: not one metric size lands on a round number of ounces, and the ounce itself lands on an untidy 31.1034768 g. That mismatch is the reason a dealer's list quotes small bars per gram, the spot feed quotes per ounce, and anyone moving between the two ends up converting several times a day.
What Helps When Cross-Checking a Bar
Enough decimals for a fractional ounce
Results run to eight decimal places, so a 1 g bar reads 0.03215075 oz t instead of rounding to a figure too coarse to total accurately.
Troy, pennyweight and tola on the same page
Searchable dropdowns on both sides list every weight unit, including troy ounce, pennyweight, grain and tola, so a quote in any of them can be checked against grams.
Totals in either direction
The swap button flips to g → kg, which is the direction you want after adding a handful of 20 g and 100 g pieces into a single holding figure.
Values ready for an inventory row
Copy returns the digits alone, so a gram or ounce figure drops straight into a holdings spreadsheet or a storage declaration without editing.
Precious-Metal Weight Questions
How does a troy ounce differ from the ounce on a kitchen scale?
They are different units that share a name. The troy ounce, used for gold, silver, platinum and palladium, is 31.1034768 g. The everyday avoirdupois ounce, used for food and parcels, is 28.349523125 g — so a troy ounce is about 9.7% heavier. The gap shows up immediately at the kilo: 1 kg is 32.15074657 troy ounces but 35.27396195 avoirdupois ounces. Bullion figures should always be written oz t or "troy oz" for that reason, and a household scale reading in ounces is not measuring the same thing a dealer is.
Why is a kilo bar described as 32.15 troy ounces?
Because 1 000 g divided by 31.1034768 g gives 32.15074657, and there is no reason for it to come out neat — the kilogram and the troy ounce were defined centuries apart in unrelated systems. The same arithmetic runs the other way at the wholesale end, where the 400 oz t nominal size long used for large gold bars works out at 12 441.39 g, about 12.44 kg. Neither system rounds kindly into the other, so the trade simply keeps both figures on the ticket.
What is a pennyweight, and why do scrap buyers still use it?
A pennyweight (dwt) is one twentieth of a troy ounce: 1.55517384 g, or 24 grains. It survives in the North American jewellery and scrap trade because it is a convenient size for small lots — a 1 kg holding is 643.01493 dwt, and a ring or a chain lands on a two-digit number rather than a decimal. It matters at the counter: a payout quoted per pennyweight covers roughly a twentieth of the metal that the same figure per troy ounce would, so it is worth confirming which unit a buyer's rate refers to before comparing offers.
How heavy is a tola bar?
One tola is 11.6638038 g, a traditional South Asian and Middle Eastern unit that is still standard for bars traded in those markets. The classic ten-tola bar therefore weighs 116.638038 g — which happens to be exactly 3.75 troy ounces, since a tola is precisely three eighths of a troy ounce. That tidy relationship is why the size stuck: it converts cleanly into the troy system even though it sits nowhere near a round number of grams.
Why is spot quoted per troy ounce when bars are sold per gram?
The wholesale market inherited the troy system from the London bullion trade and never changed it, so benchmarks and futures contracts are still written in troy ounces. Retail moved the other way, because the bars people actually buy are metric — 5, 20, 100, 250 g — and quoting per gram lets a buyer compare two products of different sizes at a glance. Both refer to the same metal: divide an ounce quote by 31.1034768 to see it per gram, or multiply a gram figure by that number to work back. Getting the two lined up in the same unit before comparing anything is the point of the exercise.
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