Quick Answers: Grams and Ounces
How Many Grams in 1 Ounce?
One ounce equals exactly 28.349523 grams. For everyday use, 28.35 grams is accurate enough for cooking and shipping.
How Many Ounces in a Gram?
One gram equals 0.035274 ounces. This is roughly 1/28th of an ounce.
How Many Grams is 4 Ounces?
Four ounces equals 113.4 grams. This is the weight of a standard US quarter-pound burger patty.
How Many Ounces is 500 Grams?
500 grams equals 17.64 ounces. This is the size of a standard European butter package.
Is 100g Equal to 4 Ounces?
No. 100 grams equals 3.53 ounces, not 4 ounces. Four ounces is 113.4 grams, about 13 grams more than 100 grams. This is a common misconception that leads to over-measuring in recipes.
Use the calculator above to convert any value between these two units. Enter your number, and the result appears instantly with the full calculation shown below.
The Conversion Formula
Two versions of the formula serve different needs. The exact formula is for scientific work and precious metals. The practical formula is for everyday cooking and shipping.
The Exact Formula
This is the legally defined conversion. The value 28.349523125 comes from the International Yard and Pound Agreement of 1959, which all English-speaking nations signed. Use this formula when precision is non-negotiable.
The Practical Formula
For everyday use, dividing by 28.35 gives results accurate to four decimal places. This is more than enough for cooking, postal services, and nutrition tracking. The difference from the exact value is smaller than the tolerance of most kitchen scales.
When to Round (vs When to Be Exact)
Not every conversion needs the same level of precision. Here is a simple rule to follow based on what you are measuring.
Everyday cooking: Round to 28 grams per ounce. A soup or stew will not notice the difference.
Baking: Use 28.35 grams per ounce. The precision matters for bread, cakes, and pastries.
Precious metals and shipping: Use the exact value 28.349523125. Small differences mean real money or incorrect postage.
How to Convert Grams to Ounces
The conversion follows one simple step: divide your gram amount by 28.35. The result is the equivalent weight in ounces. Below are four worked examples that show the calculation step by step.
Example: 100 grams of flour
- Take your gram value: 100 g
- Divide by 28.35: 100 ÷ 28.35
- Result: 3.53 ounces
Context: This is a common amount in European bread recipes. In American recipes, it is roughly three-quarters of a cup of all-purpose flour.
Example: 150 grams of sugar
- Take your gram value: 150 g
- Divide by 28.35: 150 ÷ 28.35
- Result: 5.29 ounces
Context: A typical amount for a small cake. In the US, this is just over one-third of a cup of granulated sugar.
Example: 750 grams of pasta
- Take your gram value: 750 g
- Divide by 28.35: 750 ÷ 28.35
- Result: 26.46 ounces
Context: A standard European pasta package. In the US, this is just over 1.5 pounds, close to the common 16-ounce (1 pound) boxes sold in American supermarkets.
Example: 2 kilograms of flour
- Convert to grams first: 2 kg = 2000 g
- Divide by 28.35: 2000 ÷ 28.35
- Result: 70.55 ounces
Context: A large European flour bag. In the US, this is about 4.4 pounds, close to the common 5-pound bags used by home bakers.
Gram to Ounce Conversion Table
The following table provides common gram-to-ounce conversions. It includes the small amounts used in cooking and the larger amounts used in shipping and baking.
| Grams (g) | Ounces (oz) |
|---|---|
| 1 g | 0.03527 oz |
| 5 g | 0.17637 oz |
| 10 g | 0.35274 oz |
| 15 g | 0.52911 oz |
| 25 g | 0.88185 oz |
| 50 g | 1.76370 oz |
| 100 g | 3.52740 oz |
| 125 g | 4.40924 oz |
| 150 g | 5.29109 oz |
| 200 g | 7.05479 oz |
| 250 g | 8.81849 oz |
| 300 g | 10.58219 oz |
| 400 g | 14.10958 oz |
| 500 g | 17.63698 oz |
| 750 g | 26.45547 oz |
| 1,000 g | 35.27396 oz |
| 1,500 g | 52.91094 oz |
| 2,000 g | 70.54792 oz |
| 2,500 g | 88.18490 oz |
| 5,000 g | 176.36981 oz |
| 10,000 g | 352.73962 oz |
For values not listed, divide your gram amount by 28.35. For example, 350 grams becomes 350 ÷ 28.35 = 12.35 ounces.
When Precision Matters
Converting grams to ounces comes up in several practical situations. The following scenarios show where accuracy matters and where approximation is fine.
Baking international recipes. European recipes use grams, American recipes use ounces and cups. Converting between them accurately determines whether your baked goods turn out right.
Example: French bread recipe
- Recipe calls for: 500 grams of flour
- Convert to ounces: 500 ÷ 28.35 = 17.64 oz
A baker following this recipe with American measuring tools needs this conversion to get the right flour amount. Rounding to 18 ounces would add too much flour.
Coffee and tea dosing. Specialty coffee uses grams for precision. A typical espresso dose is 18 grams of coffee. Converting this to ounces helps those using American scales.
Example: Espresso dose
- Dose: 18 grams of coffee
- Convert to ounces: 18 ÷ 28.35 = 0.635 oz
This is just under two-thirds of an ounce. Coffee enthusiasts track this precisely because small changes in dose change the taste of the espresso.
Shipping small packages. Postal services in the US price packages by the ounce. International senders who weigh in grams need to convert to know their shipping cost.
Example: Package weight
- Package weight: 250 grams
- Convert to ounces: 250 ÷ 28.35 = 8.82 oz
This package falls in the 8 to 9 ounce range for USPS pricing. Knowing the exact ounce weight determines which price tier applies.
Nutrition tracking. US food labels list serving sizes in ounces. International apps and fitness trackers use grams. Converting between them helps track macros accurately.
Example: Protein serving
- Serving size: 30 grams of protein
- Convert to ounces: 30 ÷ 28.35 = 1.058 oz
This is just over 1 ounce. Someone tracking protein intake in ounces needs this conversion to match their app's units.
Converting Common Recipe Amounts from Grams to Ounces
Most European recipes list ingredients in round gram amounts. The table below shows how these common amounts convert to ounces, along with where each amount typically appears in recipes.
| Grams (g) | Ounces (oz) | Common Use |
|---|---|---|
| 15 g | 0.529 oz | Yeast packet, single spice measure |
| 30 g | 1.058 oz | Protein serving, butter pat |
| 50 g | 1.764 oz | Chocolate bar, cheese portion |
| 100 g | 3.527 oz | Flour for small bread, berries |
| 125 g | 4.409 oz | Butter stick (European) |
| 150 g | 5.291 oz | Sugar for small cake |
| 200 g | 7.055 oz | Chocolate chips, nuts |
| 227 g | 8.007 oz | Butter (US standard stick × 2) |
| 250 g | 8.818 oz | Butter package (European) |
| 300 g | 10.582 oz | Berries, pasta portion |
| 500 g | 17.637 oz | Flour for bread, sugar bag |
| 750 g | 26.455 oz | Pasta package, sugar bag |
| 1,000 g | 35.274 oz | Flour bag, sugar kilo |
For values not listed, divide your gram amount by 28.35. For example, 400 grams becomes 400 ÷ 28.35 = 14.11 ounces.
Ounce Confusion: Common Mistakes
The word "ounce" refers to several different measurements. Mixing them up causes real problems in cooking, shipping, and precious metal transactions.
Mistake 1: "An ounce is an ounce." This is false. There are two different ounces for weight. The regular (avoirdupois) ounce is 28.35 grams. The troy ounce, used for gold, silver, and platinum, is 31.10 grams. The difference is about 10 percent.
For everyday items like food and packages, the regular ounce applies. For precious metals, only the troy ounce applies. Using the wrong one when buying or selling gold means miscalculating the value by 10 percent.
Mistake 2: "A fluid ounce is the same as an ounce." This is false. A fluid ounce measures volume, how much space something takes up. An ounce measures weight, how heavy something is. They are completely different measurements.
A fluid ounce of water weighs about 1.04 ounces. A fluid ounce of honey weighs about 1.5 ounces because honey is denser. Converting between fluid ounces and ounces requires knowing the density of the substance.
Mistake 3: "28 grams per ounce is always close enough." This depends on what you are measuring. For cooking soups and stews, rounding to 28 grams per ounce works fine. For baking bread and pastries, use 28.35 grams. For precious metals and scientific work, use the exact value 28.349523125 grams.
The context determines how much precision you need. A small rounding error in a soup recipe does not matter. The same rounding error in a gold transaction can mean hundreds of dollars.
The Precious Metals Rule
If you are buying, selling, or valuing gold, silver, or platinum, always use troy ounces. Never use regular ounces.
A troy ounce weighs 31.10 grams. A regular ounce weighs 28.35 grams. That 10 percent difference translates directly into money.
What Are Grams and Ounces?
Both units measure mass, the amount of matter in an object. They come from different measurement systems but are used worldwide for everyday weighing.
The Gram
The gram is one-thousandth of a kilogram, the base unit of mass in the metric system. It was originally defined as the mass of one cubic centimeter of water at its densest temperature.
France introduces the metric system during the French Revolution. The gram is defined as the mass of one cubic centimeter of water.
A platinum prototype kilogram is created in France. This becomes the physical standard for the kilogram, and by extension, the gram.
The International Prototype Kilogram (IPK) is established in Paris. It becomes the global standard for mass, kept under triple glass bell jars.
The gram is redefined using the Planck constant. No physical artifact is needed. The definition is now based on a fundamental constant of nature.
Today, the gram is the standard unit for small weights worldwide. It appears on food labels, in recipes, on postal scales, and in scientific work.
The Ounce
The ounce is one-sixteenth of a pound in the avoirdupois system. Since 1959, it has been defined as exactly 28.349523125 grams under international agreement.
The word "ounce" comes from the Latin "uncia," meaning one-twelfth. The Roman ounce was one-twelfth of a Roman pound, a different ratio than today.
Multiple ounce definitions exist. The Tower ounce, the Troy ounce, and the Avoirdupois ounce each serve different trades. The Avoirdupois ounce becomes standard for general goods.
The International Yard and Pound Agreement standardizes the ounce at exactly 28.349523125 grams. All English-speaking nations sign the agreement.
Today, the ounce is used primarily in the United States for cooking, postal services, and package labeling. It also appears in other countries that trade with the US.
Frequently Asked Questions
Is 1 ounce the same as 1 troy ounce?
No. A regular ounce weighs 28.35 grams. A troy ounce weighs 31.10 grams. Troy ounces are used for gold, silver, and platinum. They are about 10 percent heavier than regular ounces. Always confirm which ounce is being used when dealing with precious metals.
How do I convert a recipe from grams to ounces?
Divide the gram amount by 28.35. For example, 250 grams of flour becomes 8.82 ounces. For most home baking, this level of precision is enough. If you are scaling a recipe up significantly, use the exact value 28.349523125 for better accuracy.
Why do American recipes use ounces while European recipes use grams?
The United States kept the imperial system after independence, while Europe adopted the metric system. Grams give finer precision for small amounts, which is why professional bakers prefer them. A gram scale measures to the nearest gram, while a typical American scale measures to the nearest quarter ounce, about 7 grams.
How many grams are in a quarter pound?
A quarter pound is 4 ounces. Multiply 4 by 28.35 to get 113.4 grams. This is why a "quarter-pounder" burger patty weighs about 113 grams. In the US, this is a common burger size. In metric countries, the same patty would be labeled as a 113-gram burger.
Do I need a precise scale for cooking?
For cooking soups, stews, and stir-fries, approximate measurements work fine. For baking bread, cakes, and pastries, precision matters. A digital kitchen scale that measures to the nearest gram costs about $15 and makes a noticeable difference in baking results. Most professional bakers consider a gram scale essential equipment.
What is the difference between a fluid ounce and an ounce?
A fluid ounce measures volume, how much space something takes up. An ounce measures weight, how heavy something is. They are completely different measurements. A fluid ounce of water weighs about 1.04 ounces, but a fluid ounce of honey weighs about 1.5 ounces because honey is denser. Converting between them requires knowing the density of the substance.