Ounces to Grams Converter
Enter the weight in ounces below to convert it to grams.
Convert Ounces to Grams
Enter a value in ounces (oz) to convert to grams (g).
Ounce to Gram Conversion Table
Table showing various ounce measurements converted to grams. Click any preset value or arrow to load it into the converter.
| Ounces (oz) | Grams (g) |
|---|---|
| 1 oz | 28.3495231 g |
| 2 oz | 56.6990463 g |
| 4 oz | 113.3980925 g |
| 5 oz | 141.7476156 g |
| 8 oz | 226.796185 g |
| 10 oz | 283.4952313 g |
| 15 oz | 425.2428469 g |
| 16 oz | 453.59237 g |
| 20 oz | 566.9904625 g |
| 25 oz | 708.7380781 g |
How to Convert Ounces to Grams
To convert ounces to grams, multiply the weight by the following conversion ratio: 28.3495231 grams/ounce.
Since one ounce is equal to 28.3495231 grams, you can use this simple formula to convert:
The weight in grams is equal to the weight in ounces multiplied by 28.3495231.
For example, here's how to convert 8 ounces to grams using the formula above.
How Many Grams Are in an Ounce?
There are 28.3495231 grams in an ounce, which is why we use this value in the formula above.
Our ounce to gram calculator automatically converts your weight measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Ounces and grams are both units used to measure weight. Keep reading to learn more about each unit.
What Is an Ounce?
An ounce is a unit of weight equal to 0.0283495 kilograms (kg), the base unit for weight. Equal to 1/16 of a pound (approx. 28.3495 grams). [1]
The ounce is classified as a US customary and imperial unit of weight. Ounces can be abbreviated as oz; for example, 1 ounce can be written as 1 oz.
When working with ounces (oz) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, ounces (oz) are widely used across standard weight applications within US customary and imperial workflows, engineering documentation, and technical data sheets.
What Is a Gram?
A gram is a unit of weight equal to 1/1,000 of a kilogram (0.001 kg). Metric unit equal to one-thousandth of a kilogram (0.001 kg). [2]
The gram is classified as a metric and SI-compatible unit of weight. Grams can be abbreviated as g; for example, 1 gram can be written as 1 g.
When working with grams (g) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, grams (g) are widely used across fine-tolerance laboratory, analytical, and micro-scale weight measurements within SI metric workflows, engineering documentation, and technical data sheets.
When converting weight between ounces (oz) and grams (g), keep full floating-point precision (1 oz = 28.3495231 g; 1 g = 0.035274 oz) during intermediate calculations and round only the final gram figure to match your instrument tolerance.
More Ounce & Gram Conversions
Need to calculate in the opposite direction? Use our grams to ounces converter (g to oz) to switch your starting unit immediately. You can also explore related tools such as converting kilograms to grams, converting milligrams to grams, or converting ounces to pounds.
Convert from Ounces
Weight and volume require ingredient density (g/mL). Choose a USDA FoodData Central verified ingredient below:
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Mass)·Mass & Weight Metrology Standard — Ounces (oz) to Grams (g)
- [2]NIST HB 44 SpecificationNIST HB 44 (NIST Handbook 44 (Current Ed.))·Unit Specifications: Ounce (oz) & Gram (g)
- [3]BIPM ReferenceBIPM (SI Base Unit: Kilogram (kg))·Conversion Factors & Mathematical Basis (oz to g)