Grams to Oz Converter
Result
3.5274 oz
Also Equal To
How Grams to Ounces Conversion Works
A gram-to-ounce conversion translates a metric mass measurement into the Imperial ounce used in the United States and United Kingdom. One gram equals approximately 0.035274 avoirdupois ounces, as defined by the National Institute of Standards and Technology (NIST). This factor is the mathematical inverse of the ounce-to-gram conversion: 1 / 28.349523125 = 0.035274.
This conversion is used daily by millions of people worldwide. European and Asian cooks adapting recipes for American kitchens need to convert grams to ounces. International shippers compare metric and Imperial weight limits. Nutritionists translate between food labeling standards -- the EU uses grams per 100 g while the US FDA uses serving sizes in ounces or grams. According to the USDA, the average American consumes approximately 2,000 grams (70.5 oz) of food and beverages per day.
Our Oz to Grams Converter handles the reverse conversion. For broader weight conversions including pounds and kilograms, use the Weight Converter.
The Grams to Ounces Formula
The formula for converting grams to ounces divides by the grams-per-ounce factor:
Ounces = Grams / Conversion Factor
- For avoirdupois ounces: divide by 28.3495 (or multiply by 0.035274)
- For troy ounces: divide by 31.1035 (or multiply by 0.032151)
Worked example: A European recipe calls for 350 grams of chicken breast. Converting: 350 / 28.3495 = 12.35 oz. At a US grocery store, you would buy about 12.5 oz (or roughly 3/4 of a pound) of chicken. These conversion factors are exact, derived from the 1959 International Yard and Pound Agreement.
Key Terms You Should Know
- Gram (g) -- The base metric unit of mass, equal to 1/1000 of a kilogram. Since 2019, the gram is defined through the Planck constant by the International Bureau of Weights and Measures (BIPM). It is the world's most widely used unit for everyday mass measurement.
- Avoirdupois Ounce (oz) -- The standard ounce in the US and UK, equal to 28.3495 grams. Used for food, mail, personal weight, and general commerce. There are 16 avoirdupois ounces in one pound.
- Troy Ounce (oz t) -- Equal to 31.1035 grams, used for precious metals. Named after Troyes, France. There are only 12 troy ounces per troy pound, making the troy pound (373.2 g) lighter than the avoirdupois pound (453.6 g).
- Kilogram (kg) -- Equal to 1,000 grams. The SI base unit of mass. One kilogram equals approximately 35.274 ounces or 2.205 pounds.
- Milligram (mg) -- Equal to 1/1000 of a gram. Common in pharmaceutical dosing and nutritional labeling for micronutrients like vitamins and minerals.
Grams to Ounces Conversion Table
Common gram-to-ounce conversions based on the NIST-defined factor of 28.349523125 g per avoirdupois ounce.
| Grams | Avoirdupois Oz | Troy Oz | Pounds |
|---|---|---|---|
| 10 g | 0.353 | 0.322 | 0.022 |
| 25 g | 0.882 | 0.804 | 0.055 |
| 50 g | 1.764 | 1.608 | 0.110 |
| 100 g | 3.527 | 3.215 | 0.220 |
| 200 g | 7.055 | 6.430 | 0.441 |
| 250 g | 8.818 | 8.038 | 0.551 |
| 500 g | 17.637 | 16.075 | 1.102 |
| 750 g | 26.455 | 24.113 | 1.653 |
| 1,000 g (1 kg) | 35.274 | 32.151 | 2.205 |
Practical Examples
Cooking with a European recipe: A French recipe calls for 180 grams of butter. Converting: 180 / 28.3495 = 6.35 oz. Since US butter sticks are 4 oz (113 g) each, you need 1.5 sticks plus about 0.35 oz (roughly 2 teaspoons). Use our Cooking Converter for volume-to-weight cooking conversions.
Comparing nutrition labels: A European cereal lists 12 g of sugar per 100 g serving. The same cereal in the US lists sugar per 1 oz (28.35 g) serving. To compare: 12 g per 100 g = 3.4 g per 28.35 g serving. If the US label shows 4 g of sugar per ounce, the US version has more sugar per gram than the European version.
Precious metals valuation: You have a silver coin weighing 62.2 grams. In troy ounces: 62.2 / 31.1035 = 2.0 troy ounces exactly. At a silver price of $28 per troy ounce, the coin's silver content is worth $56. If you mistakenly used avoirdupois ounces (62.2 / 28.3495 = 2.19 oz), you would overestimate the troy ounce count and the value.
Tips for Accurate Grams to Ounces Conversion
- Use the "divide by 30" shortcut: For quick mental math, dividing grams by 30 gives an approximate ounce value within 5.5% of exact. Example: 150 g / 30 = 5 oz (exact: 5.29 oz). Close enough for grocery shopping.
- Remember the 100 g = 3.5 oz benchmark: This anchor point makes mental conversion easier. 200 g is about 7 oz, 300 g is about 10.5 oz, and 500 g is about 17.5 oz.
- Verify troy vs avoirdupois for metals: If you are converting gold, silver, platinum, or palladium weights, always use troy ounces (divide by 31.1035). The 9.7% difference has significant financial implications.
- Check recipe origin before converting: Some recipes list ingredients in both grams and ounces. If so, use the given ounce value rather than converting, as the recipe author may have already rounded for convenience.
- Use a digital scale with unit switching: Many modern kitchen scales can toggle between grams and ounces at the press of a button, eliminating conversion calculations entirely.
Global Adoption of Metric Weights
The gram is part of the International System of Units (SI) maintained by the BIPM. As of 2026, only three countries have not officially adopted the metric system: the United States, Myanmar, and Liberia. Even in the US, grams are the legal standard for drug dosing (FDA), nutritional labeling (USDA), and scientific research (NSF). The 2019 redefinition of the kilogram -- replacing the physical prototype with a definition based on the Planck constant -- made the gram the most precisely defined mass unit in history, accurate to better than 1 part in 100 million.
Frequently Asked Questions
How many ounces is 100 grams?
100 grams equals approximately 3.527 avoirdupois ounces. The calculation is 100 divided by 28.3495, which gives 3.5274 oz. For practical purposes, 100 grams is about 3.5 oz. This is a frequently needed conversion because the European Union mandates that all food nutrition labels display values per 100 grams, while US food labels use serving sizes in ounces. For troy ounces (used in precious metals), 100 grams equals 3.215 troy ounces.
How do I convert grams to ounces?
To convert grams to ounces, divide the gram value by 28.3495. For example, 250 grams divided by 28.3495 equals 8.82 ounces. For a quick mental estimate, divide by 30 -- this gives a result within about 5.5% of the exact value, which is close enough for most cooking and everyday purposes. For more precision, divide by 28.35. This conversion uses the avoirdupois ounce as defined by the 1959 International Yard and Pound Agreement. For precious metals, divide by 31.1035 to get troy ounces.
How many grams is 1 oz?
One avoirdupois ounce equals exactly 28.349523125 grams, as defined by NIST. For everyday use, rounding to 28.35 grams is sufficiently precise. This is the standard ounce used in cooking, grocery shopping, and shipping in the US and UK. A troy ounce, used for precious metals, equals 31.1035 grams -- about 9.7% more. The avoirdupois ounce is part of the Imperial system where 16 ounces make 1 pound (453.59 grams).
What is 500 grams in ounces?
500 grams equals approximately 17.64 ounces, or about 1.1 pounds. The exact calculation is 500 / 28.3495 = 17.637 oz. Since 16 oz equals 1 pound, 500 grams is 1 pound and 1.64 ounces. This is a common conversion because 500 grams (half a kilogram) is a standard packaging size in metric countries for items like pasta, ground coffee, and butter. In the US, the closest equivalent is a 1 lb (453.6 g) package, which is about 46 grams lighter.
How do I convert grams to ounces for gold?
For gold and other precious metals, divide grams by 31.1035 to get troy ounces -- not by 28.3495 (the avoirdupois ounce). For example, a 50-gram gold bar equals 50 / 31.1035 = 1.607 troy ounces. At a gold price of $2,350 per troy ounce, that bar would be worth approximately $3,778. Using the wrong ounce type would overestimate the troy ounce count by 9.7%, significantly mispricing the metal.
Is 200 grams the same as 8 oz?
No, 200 grams is approximately 7.05 ounces, not 8 ounces. Eight ounces equals 226.8 grams, which is 26.8 grams (about 13.4%) more than 200 grams. This is a common misconception because both are round numbers that seem like they should align. In cooking, the difference matters -- if a recipe calls for 8 oz (226.8 g) of cream cheese and you use 200 g, you are short by nearly 12%. Always convert precisely rather than assuming round-number equivalence.