Metal weight converter
Convert between grams, troy ounces, kilograms, ordinary ounces, pounds and tolas.
Quick answer: One troy ounce is exactly 31.1034768 grams, so one kilogram is about 32.15 troy ounces. An ordinary (avoirdupois) ounce is lighter, at 28.35 grams.
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Calculate to update this worksheet from your inputs.
Scenario chart
Scenarios change one input while holding the others constant. They are calculations, not observed market prices or forecasts.
Detailed calculation table
The table contains the same inputs used for your result. Values are rounded for display; CSV preserves more precision.
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A complete weight worksheet
How to use this calculator
- Choose the unit actually shown on your scale or product specification. Troy and ordinary ounces are separate options.
- Enter the weight of one item, then the number of identical items in the batch.
- Set a measurement tolerance if you want to see how uncertainty in the scale reading affects the total.
One troy ounce converts to 31.1034768 grams. Ten identical one-troy-ounce items contain 311.034768 grams of gross mass before purity adjustments.
Read the whole batch
The result converts the total batch, not just one item. The conversion table shows that same physical mass in every supported unit. Its numbers differ because the size of each unit differs; the chart instead keeps everything in grams and compares batch sizes on a common basis.
Keep precision separate from accuracy
Conversion factors can be precise even when a scale is not. A tolerance of 1% means a symmetric interval around your entered mass; it is not a statistical confidence interval. Extra decimal places do not make a rounded product weight or an uncalibrated scale more accurate.
Use fine weight for valuation
Gross weight includes alloying metals and may include fittings or stones. Convert the mass first, then use the purity calculator to estimate fine-metal content. A kilogram of 18K alloy is not a kilogram of pure gold. This worksheet converts mass only and cannot convert a volume without a material density.
Questions about this calculation
Is a troy ounce the same as an ordinary ounce?
No. The troy ounce is 31.1034768 grams; the ordinary avoirdupois ounce is 28.349523125 grams. Choose the stated unit rather than assuming they are interchangeable.
What does quantity mean?
The count of identical items. If weights differ, add the measured masses before entering a single combined weight with quantity one.
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