Ounces to Grams Calculator: Convert oz to g Easily
Use this tool to convert ounces (oz) to grams (g) quickly and accurately—perfect for recipes, nutrition labels, and international product comparisons.
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Understanding the Conversion from Ounces to Grams
Ounces and grams are two of the most commonly used units of weight, especially when it comes to food, nutrition, cooking, and consumer goods. Ounces are used in the imperial and U.S. customary systems, while grams are a part of the metric system. Being able to convert ounces to grams is essential when interpreting international recipes, buying products online, or preparing food accurately.
What Is an Ounce (oz)?
An ounce is a unit of weight used primarily in the United States and a few other countries. There are two main types of ounces:
- Avoirdupois ounce (oz): Most common; used for body weight, groceries, cooking (1 oz = 28.349523125 grams)
- Troy ounce: Used in precious metals (1 troy oz = 31.1034768 grams)
This calculator uses the avoirdupois ounce unless otherwise specified.
What Is a Gram (g)?
A gram is a metric unit of mass, equal to one-thousandth of a kilogram. It's widely used in science, food labeling, and everyday measurements in most countries worldwide. 1,000 grams make up 1 kilogram, and it's the base unit for measuring solid weights in the metric system.
Conversion Formula
Grams = Ounces × 28.349523125
Example: 3 oz × 28.349523125 = 85.0486 gOunces to Grams Conversion Table
| Ounces (oz) | Grams (g) |
|---|---|
| 1 | 28.35 |
| 2 | 56.70 |
| 4 | 113.40 |
| 8 | 226.80 |
| 12 | 340.19 |
| 16 (1 lb) | 453.59 |
| 32 | 907.18 |
Common Applications
- Cooking: Recipes from the US often list ingredients in ounces, while international recipes typically use grams.
- Nutrition labels: Some packaging lists serving sizes in ounces; conversion to grams helps compare products globally.
- Fitness and supplements: Protein powders, creatine, and dietary supplements often use ounces/grams interchangeably.
- Online shopping: Knowing the conversion helps when purchasing items from countries that use different systems.
- Scientific experiments: Lab weights and materials often require precise metric conversions.
Ounces vs Grams: Key Differences
| Attribute | Ounce (oz) | Gram (g) |
|---|---|---|
| System | Imperial / US Customary | Metric (SI) |
| Common Use | US recipes, packaging | International standards, scientific |
| 1 oz equals | — | 28.35 grams |
| Used in | US, some UK uses | Global except US/UK |
FAQ: Ounces to Grams
How many grams are in an ounce?
1 ounce (avoirdupois) = 28.349523125 grams.
What is the difference between troy and avoirdupois ounces?
A troy ounce is used for measuring precious metals like gold and silver and equals 31.1034768 grams. The avoirdupois ounce (used in this calculator) equals 28.349523125 grams and is used for most other purposes.
Why do recipes use ounces instead of grams?
Recipes from the United States and older British sources often use ounces. Metric-based recipes—common in Europe, Asia, and Australia—use grams. It depends on the country of origin.
Can I round 1 oz to 28 grams?
Yes, for everyday cooking or casual use, rounding 1 oz = 28 g is acceptable. For precision needs (e.g. lab work), use the full value.
Is this calculator suitable for dry and liquid ounces?
This calculator converts weight ounces (mass). Fluid ounces measure volume and must be converted differently, depending on the substance's density.
International Considerations
- Grams: Standard in most parts of the world, including EU, Canada, Australia, and Asia.
- Ounces: Still widely used in the US for food, shipping, and retail weights.
- Online products often include both units for clarity.
Conclusion
Whether you're working in the kitchen, browsing global marketplaces, or following a health plan, converting ounces to grams is a skill that saves time and confusion. Our calculator ensures you always get the correct weight when switching between imperial and metric systems. Bookmark this page for quick access whenever you encounter ounces in recipes or labels.