Gold Size Calculator
Enter the weight of the gold, its unit and karat, and a price per troy ounce if you want a value. The calculator gives the volume, the size of an equal cube and the pure gold inside.
- Volume
- Cube size
- Pure gold
A troy ounce is 31.1 g, heavier than an ordinary ounce.
Gold is very dense, 19.32 g/cm³ when pure. One troy ounce of 24 karat gold is 31.1 g, only 1.61 cm³. As a cube it would be about 11.7 mm on each side, smaller than a sugar cube.
Gold size chart
24 karat. Search for a weight.
| Weight | Grams | Volume (cm³) | Cube (mm) |
|---|---|---|---|
| 1 g | 1 | 0.052 | 3.7 |
| 5 g | 5 | 0.259 | 6.4 |
| 10 g | 10 | 0.518 | 8 |
| 1 troy oz | 31.1 | 1.61 | 11.7 |
| 100 g | 100 | 5.176 | 17.3 |
| 10 troy oz | 311.04 | 16.099 | 25.3 |
| 1 kg | 1000 | 51.76 | 37.3 |
| 400 troy oz bar | 12441.4 | 643.965 | 86.4 |
Volume.
Weight and size
24 karat. Slide the troy ounces.
The cube grows beside a sugar cube.
How to work out gold size
Weight to volume. Step through it.
Weight
Grams.
Weigh in grams for the most accurate result.
24, 18 or 14 karat
Gold purity. Compare them.
Pure.
Fine jewellery.
Everyday.
Lower karat gold is mixed with other metals, so it is lighter for its size.
Before you buy
Gold checks. Tick each item.
Tick each item as you go.
Check hallmarks and buy from a trusted dealer.
What you get
Gold sizing. Each tile explains one result.
cm³.
mm.
Gold content.
At your price.
Compared.
All the gold ever mined would fit in a cube about 22 m across.
Frequently Asked Questions
No question matches that search.
How big is an ounce of gold?
A troy ounce of pure gold is about one point six cubic centimetres, a cube about twelve millimetres across.
How big is a kilogram of gold?
About fifty two cubic centimetres, roughly the size of a smartphone.
Why is gold so small for its weight?
It is one of the densest metals, over nineteen times as dense as water.
What is a troy ounce?
Thirty one point one grams, the unit used for precious metals.
Is eighteen karat gold bigger than twenty four karat for the same weight?
Yes, because the mix is less dense.
How much pure gold is in fourteen karat?
About fifty eight point five per cent.
Can I work out the value?
Yes. Enter the price per troy ounce.
Small but heavy
See just how little space your gold takes up, and how much pure gold it holds.
More size calculators
Each one has its own calculator, worked examples and answers to common questions.