Choose a Measurement
Select a measurement and convert between different units
Single conversion
To convert from Ounce (oz) to Gram (g), use the following formula:
With is the ratio between the base units Gram (g) and Pound (lb).
Let's convert 5 Ounce (oz) to Gram (g).
Using the formula:
Therefore, 5 Ounce (oz) is equal to Gram (g).
Here are some quick reference conversions from Ounce (oz) to Gram (g):
| Ounces | Grams |
|---|---|
| 0.000001 oz | g |
| 0.001 oz | g |
| 0.1 oz | g |
| 1 oz | g |
| 2 oz | g |
| 3 oz | g |
| 4 oz | g |
| 5 oz | g |
| 6 oz | g |
| 7 oz | g |
| 8 oz | g |
| 9 oz | g |
| 10 oz | g |
| 20 oz | g |
| 30 oz | g |
| 40 oz | g |
| 50 oz | g |
| 100 oz | g |
| 1000 oz | g |
| 10000 oz | g |
For all Weight converters, choose units using the From/To dropdowns above.
An ounce (oz) is a unit of mass in the imperial system, equal to 0.0625 (or 1/16) Pounds (lb).
While most people are familiar with the standard ounce used for groceries, there is another crucial measurement called the Troy Ounce.
The standard ounce, officially known as the Avoirdupois ounce, is approximately 28.35 grams and is used for weighing everyday items.
The Troy ounce, however, is slightly heavier, at approximately 31.1 grams, and is the universal standard for measuring precious metals, such as gold, silver, and platinum. This distinction is vital in the jewelry and investment markets.
A common point of confusion is the difference between an ounce (oz) and a fluid ounce (fl oz).
An ounce is a unit of mass (weight), while a fluid ounce is a unit of volume.
For example, you would use ounces to weigh a block of cheese but fluid ounces to measure a glass of milk. The weight of one fluid ounce of a liquid depends entirely on its density; one fluid ounce of honey, for instance, weighs more than one fluid ounce of water.
The word "ounce" comes from the Latin uncia.
In ancient Rome, an uncia was one-twelfth of a libra (the Roman pound), and that system helped shape many European measures.
Today's avoirdupois ounce is one-sixteenth of a pound. However, the name still preserves a direct link to Rome's old system of weights and measures.
A gram (g) is a base unit of mass in the metric system. The plural form is grams.
The gram was initially defined in 1795 by the French National Convention.
Its first definition was based on the mass of one cubic centimeter of pure water at the temperature of its maximum density, which is approximately 4 degrees Celsius (4 °C).
This practical, water-based definition was a revolutionary step toward a standardized and universal system of measurement, moving away from the inconsistent and often confusing units of time.
A gram is much smaller than an ounce, the standard unit of mass in the imperial and US customary systems.
One ounce equals approximately 28.35 grams, which is why grams are preferred for scientific work and for measuring small amounts, such as spices or medicine.
The metric system's decimal structure (for example, 1,000 grams in a kilogram) also makes calculations simpler than in the imperial system.
Although the gram was once tied to water, it's no longer linked to any physical object.
Since 2019, the kilogram — and therefore the gram — is defined by a fundamental constant, the Planck constant (h).
That shift makes the unit stable and reproducible in any properly equipped laboratory, without relying on the old International Prototype of the Kilogram.