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Gold Weight Calculator

Calculate gold weight instantly from dimensions. Get results in troy ounces, grams, and pounds for bars, coins, sheets, and custom shapes using 19.

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Frequently Asked Questions

Common questions about gold weight.

Pure gold (24K) has a density of 19.32 grams per cubic centimeter, which equals 1,206 pounds per cubic foot or 0.698 pounds per cubic inch. This high density makes gold one of the heaviest common metals.

Lower karat gold contains other metals (alloys) which are typically less dense than pure gold. For example, 14K gold is only 58.3% gold, so the same volume weighs less than 24K gold because the added metals like copper or silver are lighter.

Troy ounces are the traditional unit for precious metals, dating back to medieval French trade. One troy ounce equals 31.1 grams, slightly heavier than a standard (avoirdupois) ounce at 28.35 grams.

A standard London Good Delivery gold bar weighs approximately 400 troy ounces (12.4 kg or 27.4 lbs). Smaller gold bars range from 1 ounce to 100 ounces, while large vault bars can exceed 400 ounces.

For irregular shapes, estimate the volume using water displacement or break the shape into simpler geometric forms. Once you have the volume in cubic centimeters, multiply by 19.32 to get the weight in grams for pure gold.

How to Calculate

To calculate gold weight, measure your gold object's dimensions (length, width, height) and determine its shape. The calculator uses the formula **Weight = Volume × Density**, where gold's density is 19.32 g/cm³. First, calculate the volume based on the shape (for a rectangular bar: length × width × height), then multiply by gold's density. Adjust for purity if your gold is less than 24K — for example, 18K gold is 75% pure, so multiply the result by 0.75.

Formula & Method

Weight (g) = Volume (cm³) × 19.32 g/cm³ × Purity Factor

For rectangular bars: Volume = Length × Width × Height
For cylinders: Volume = π × r² × Height
For spheres: Volume = (4/3) × π × r³

Purity factors: 24K = 1.0, 22K = 0.917, 18K = 0.75, 14K = 0.583, 10K = 0.417

Sources & References

https://www.rsc.org/periodic-table/element/79/gold
https://www.lbma.org.uk/precious-metals
https://www.engineeringtoolbox.com/metal-alloys-densities-d_50.html

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