Precious Metals Converter

Convert precious-metal fine weights between troy ounce, troy pound, pennyweight, grain, gram, and kilogram for bullion and jewellery reference.

Quick starts

Bullion reference

The public tool stays on the exact fine-weight family used in precious-metals trading: gram, kilogram, troy ounce, troy pound, pennyweight, and grain.

Result

31.1035 g

Metric equivalent for 1 troy ounce.

UnitEquivalent
Gram (g)31.1035
Kilogram (kg)0.0311
Troy ounce (oz t)1
Troy pound (lb t)0.0833
Pennyweight (dwt)20
Grain (gr)480

Trading context

One troy ounce always equals 20 pennyweight and 480 grains. That is why jewellers, refiners, and commodity desks treat troy-weight notation differently from everyday avoirdupois pounds and ounces.

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Precious Metals

Precious metals converter: troy ounces, pennyweight, grains, and metric bullion weights

A precious metals converter keeps one fine-weight value consistent while the labels around it shift between bullion, refining, and jewellery notation. That matters because precious-metal trading does not use the same ounce and pound family as everyday package weight or kitchen measures.

Why precious metals use troy weight instead of everyday ounces

Bullion and jewellery workflows rely on the troy system, where the base relationships differ from ordinary avoirdupois mass. A troy ounce is heavier than an everyday ounce, and a troy pound contains 12 troy ounces rather than 16.

That difference is why a dedicated precious-metals converter is safer than a generic weight tool when the context is gold, silver, platinum, assay work, or fine-weight inventory. The practical question is not simply what a mass equals in grams, but whether the surrounding trade notation stays in the correct family.

The exact fine-weight relationships used here

The converter keeps grams as the base and derives the troy units from exact grain relationships. One grain equals exactly 64.79891 milligrams. From there, one pennyweight equals 24 grains, one troy ounce equals 480 grains, and one troy pound equals 12 troy ounces.

That gives exact metric anchors of 31.1034768 grams per troy ounce, 1.55517384 grams per pennyweight, and 373.2417216 grams per troy pound. The calculator keeps those relationships explicit so the bullion-side units and metric-side units describe the same fine weight with no silent rounding drift.

1 gr = 0.06479891 g

Exact grain relationship used as the underlying fine-weight anchor.

1 dwt = 24 gr = 1.55517384 g

Pennyweight relationship commonly used in jewellery and assay work.

1 oz t = 480 gr = 31.1034768 g

Exact troy-ounce relationship used in bullion contracts and pricing.

Where gram and troy notation meet in practice

Retail bars and mint products often mix metric labelling with troy-ounce market language. A bar might be stamped in grams, while the spot price or dealer spread is discussed per troy ounce. Jewellers may weigh a piece in grams but still think in pennyweight when comparing fine-weight benchmarks.

A dedicated converter makes those conversations safer because it keeps the metric and troy views visible together without drifting into the wrong ounce or pound family. It is especially useful when checking invoices, refining lots, or product listings written for different markets.

Frequently asked questions

Is a troy ounce the same as a regular ounce?

No. A troy ounce is 31.1034768 grams, while an everyday avoirdupois ounce is 28.349523125 grams. Precious metals use the troy ounce, not the everyday ounce.

 How many pennyweight are in one troy ounce?

Exactly 20 pennyweight. That follows from the grain relationships: 1 troy ounce = 480 grains and 1 pennyweight = 24 grains.

 Why does the tool not show ordinary pounds and ounces?

Because this page is for precious-metal fine weight, where the troy family is the relevant standard. Mixing in everyday pounds and ounces would make it easier to compare the wrong measurement family by mistake.

 Can I use this converter for pricing gold or silver?

It can help you keep the weight consistent across unit systems, but it does not provide live market prices, purity adjustments, or dealer spreads. Pricing decisions still need the current market quote and the product’s fineness.

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