Ounces to Grams Converter

Convert ounces to grams and grams to ounces instantly. Quick reference table for common weight conversions.

Ounces

28.35 g

Equivalent in pounds

0.063 lb

Equivalent in kilograms

0.0283 kg

This converter uses weight ounces (avoirdupois), not fluid ounces. For fluid ounces, use the universal cooking converter.

Ounces to Grams Quick Reference

Ounces	Grams	Pounds	Kilograms
0.5	14.2	0.031	0.0142
1	28.3	0.063	0.0283
2	56.7	0.125	0.0567
3	85.0	0.188	0.0850
4	113.4	0.250	0.1134
5	141.7	0.313	0.1417
6	170.1	0.375	0.1701
8	226.8	0.500	0.2268
10	283.5	0.625	0.2835
12	340.2	0.750	0.3402
16	453.6	1.000	0.4536
32	907.2	2.000	0.9072

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Ounces to grams converter. Instant weight conversion between imperial and metric systems.

An ounces to grams converter translates weight from ounces (oz) to grams (g) by multiplying by the exact factor of 28.3495. It works bidirectionally for the standard avoirdupois ounce used in cooking, food packaging, and everyday weighing.

What Is an Ounces to Grams Conversion?

An ounces to grams conversion translates weight from the imperial system (ounces) to the metric system (grams). One avoirdupois ounce equals exactly 28.3495 grams. This is the standard ounce used in everyday cooking, grocery shopping, and food packaging in the United States.

The conversion is essential for anyone who cooks with both American and international recipes. Most recipes outside the US measure ingredients in grams, while American recipes rely heavily on ounces and pounds. A 6 oz package of chocolate chips, for instance, weighs 170 g. Knowing this conversion lets you follow European, Asian, or Latin American recipes without guesswork.

Our ounces to grams converter works bidirectionally. Enter ounces to get grams, or enter grams to get ounces. It handles the standard avoirdupois ounce used in cooking, not the troy ounce used for precious metals.

How to Convert Ounces to Grams

To convert ounces to grams, multiply the number of ounces by 28.3495. This is a straightforward calculation because both ounces and grams are weight measurements, so the conversion factor is constant regardless of the ingredient.

Here is the step-by-step process:

1. Take the number of ounces you want to convert.

2. Multiply by 28.3495 (or use 28.35 for quick mental math).

3. The result is the weight in grams.

For the reverse conversion (grams to ounces), divide the grams by 28.3495.

For example, 8 oz = 8 x 28.35 = 226.8 g. Or going the other way, 500 g = 500 / 28.35 = 17.64 oz.

Unlike cups-to-grams conversions, this calculation does not depend on the ingredient. An ounce of flour and an ounce of butter both weigh exactly 28.35 g because you are converting between two weight units, not between volume and weight.

Ounces to Grams Formula

W_g = W_{oz} \times 28.3495

$W_g$ = Weight in grams
$W_{oz}$ = Weight in ounces (avoirdupois)
$28.3495$ = The exact conversion factor from ounces to grams

For the reverse conversion:

W_{oz} = \frac{W_g}{28.3495}

Here is a quick reference for common values:

- 1 oz = 28.35 g - 2 oz = 56.70 g - 4 oz (1/4 lb) = 113.40 g - 8 oz (1/2 lb) = 226.80 g - 12 oz (3/4 lb) = 340.19 g - 16 oz (1 lb) = 453.59 g

Note the distinction between avoirdupois ounces and troy ounces. The avoirdupois ounce (28.3495 g) is the standard in cooking and everyday use. The troy ounce (31.1035 g) is used exclusively for precious metals like gold and silver. Our converter uses the avoirdupois ounce.

Ounces to Grams Conversion Examples

Converting a Steak Recipe from Grams to Ounces

A recipe calls for a 250 g steak per serving. You are at an American butcher counter where meat is sold by the ounce. To convert: 250 / 28.35 = 8.82 oz. You would ask for a 9 oz steak (or roughly a half-pound steak, since 8 oz = 1/2 lb). The extra 0.18 oz (about 5 g) is negligible for a steak.

Measuring Chocolate for a European Cake Recipe

A German chocolate cake recipe calls for 200 g of dark chocolate. Your chocolate bars are sold in 4 oz portions. Converting: 200 / 28.35 = 7.05 oz. You need just over 7 oz, which means buying two 4 oz bars (8 oz total = 226.8 g) and using 200 g from the total. With a kitchen scale, weigh out 200 g and save the remaining 26.8 g for snacking.

Scaling a Recipe from 12 oz to Metric for International Guests

Your family pasta sauce recipe calls for 12 oz of crushed tomatoes. A friend in Europe asks for the recipe in grams. Converting: 12 x 28.35 = 340.2 g. You would tell them to use 340 g, which conveniently matches a standard 400 g European can with a bit removed (or they could use the full can for a slightly saucier result).

Tips for Accurate Ounce to Gram Conversions

For quick mental math, use 28.35 as the conversion factor, or round to 28 for a rough estimate. The error from rounding to 28 is only 1.2%, which is acceptable for most cooking applications.
Do not confuse weight ounces (oz) with fluid ounces (fl oz). Weight ounces measure mass, while fluid ounces measure volume. 8 fl oz of water weighs about 8.35 oz (237 g), not exactly 8 oz (227 g). Our converter handles weight ounces only.
When a recipe lists both ounces and grams (e.g., "8 oz / 225 g"), trust the gram value if you have a scale. The gram value is typically the author's original measurement, while the ounce is a rounded conversion.
Remember that 16 ounces = 1 pound = 453.59 grams. This means 1 pound is just under half a kilogram. A 2.2 lb package is approximately 1 kg.
Many US food labels display both ounces and grams. The gram value on the package is the more precise measurement since FDA regulations require metric weights on nutrition labels.
If you are converting large quantities (more than a few pounds), switch to kilograms for convenience: 1 oz = 0.02835 kg. For example, 5 lbs = 80 oz = 2.268 kg.

Frequently Asked Questions About Ounces to Grams

How many grams are in an ounce?

One avoirdupois ounce equals exactly 28.3495 grams. For practical cooking purposes, 28.35 g per ounce is precise enough. This is the standard ounce used in American cooking, grocery stores, and food packaging.

How many ounces are in 100 grams?

100 grams equals approximately 3.527 ounces. A quick approximation: 100 g is about 3.5 oz. This is a common conversion for European recipes that specify ingredients in round gram amounts.

What is the difference between an ounce and a fluid ounce?

An ounce (oz) measures weight, while a fluid ounce (fl oz) measures volume. They are not interchangeable. One fluid ounce of water weighs about 1.043 oz (29.57 g) because water is slightly denser than 1 oz per fl oz. For ingredients other than water, the difference between weight ounces and fluid ounces can be much larger.

What is the difference between avoirdupois ounces and troy ounces?

The avoirdupois ounce (28.3495 g) is the standard ounce used for food, everyday objects, and body weight. The troy ounce (31.1035 g) is used exclusively for precious metals like gold, silver, and platinum. A troy ounce is about 9.7% heavier than an avoirdupois ounce. Cooking always uses avoirdupois ounces.

How many grams are in a pound?

One pound equals 453.592 grams, or approximately 454 g. Since there are 16 ounces in a pound, this is simply 16 x 28.3495 = 453.592 g. Conversely, 1 kilogram equals approximately 2.205 pounds.

Why do American recipes use ounces instead of grams?

The United States is one of only three countries that has not officially adopted the metric system (along with Myanmar and Liberia). American cookbooks, food packaging, and kitchen scales have traditionally used the imperial system (ounces, pounds, cups). However, many professional bakers and chefs in the US now prefer grams for their precision.

Is it more accurate to measure in grams or ounces?

Grams offer greater precision for cooking because they are a smaller unit. One ounce equals 28.35 grams, so measuring in grams gives you 28 times finer resolution. This matters most in baking, where small differences in flour or sugar can affect texture and rise. Most professional pastry chefs worldwide measure in grams regardless of their country.

How do I convert ounces to grams without a calculator?

For quick estimates, multiply ounces by 28. For example, 6 oz x 28 = 168 g (the exact value is 170.1 g, so the error is under 1.3%). Another trick: divide the ounces by 4 and then multiply by 113. For example, 8 oz / 4 = 2, then 2 x 113 = 226 g (exact: 226.8 g).

Key Terms

Ounce (Avoirdupois)

The standard unit of weight in the US customary system, equal to 28.3495 grams or 1/16 of a pound. Used for food, body weight, and everyday objects.

Troy Ounce

A unit of weight equal to 31.1035 grams, used exclusively for precious metals. Not used in cooking.

Gram

The base unit of mass in the metric system, equal to one thousandth of a kilogram. The worldwide standard for measuring food ingredients by weight.

Pound

A unit of weight equal to 16 avoirdupois ounces or 453.592 grams. Commonly used in the US for larger quantities of food.

Fluid Ounce

A unit of volume (not weight) equal to approximately 29.57 mL. Often confused with the weight ounce but measures a different physical property.

Imperial System

The system of measurement using ounces, pounds, cups, and Fahrenheit, traditionally used in the US and UK. Distinct from the metric system used by most countries.

Metric System

The international decimal system of measurement based on grams, liters, and meters. Used in virtually all countries outside the US for cooking and food labeling.