How to Convert Ounces to Grams (Chart & Formula)

Ounces and grams live side by side in American life—one on your kitchen scale, the other on your supplement bottle or shipping label.

Converting ounces to grams is useful when you need to switch between the U.S. customary and metric measurement systems.

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Ounces to Grams Converter

Convert ounces (oz) to grams (g), or g to oz, instantly. Perfect for recipes, coffee, and measuring meat in the USA.

Amount

Ounces → Grams Grams → Ounces

⇅

Result

226.7962 g

8 oz × 28.349523125 = 226.7962 g

Common conversions

1 oz 4 oz 8 oz 12 oz 16 oz 32 oz

What is an Ounce (oz)?

An ounce (oz) is a unit of weight (mass) commonly used in the United States and other countries that use the US customary system. It is the most common unit for food in America.

The type we use for weight is called the avoirdupois ounce. Don’t confuse it with the fluid ounce (fl oz), which measures volume, not weight.

1 pound (lb) = 16 ounces (oz)

In the US, ounces are everywhere. You’ll find them in:

• Cooking:
  • Recipes may specify small quantities of ingredients by weight, such as 2 oz of chocolate or 4 oz of cheese.
  • 8 oz cream cheese, 16 oz steak.

• Coffee:
  • 12 oz coffee bags.

• Postal service:
  • Package weight in ounces.
  • If a package weighs 8 oz, it weighs ½ pound.

• Gold & Silver:
  • Precious metals such as gold and silver are measured in troy ounces, which are slightly heavier than regular ounces. A regular ounce equals 28.3495 grams, while a troy ounce equals 31.1035 grams.
  • Regular ounce (oz) = 28.3495 grams
  • Troy ounce (oz t) = 31.1035 grams

Important: In the USA, ounce (oz) generally refers to weight, while fluid ounce (fl oz) refers to volume. They are not interchangeable.

What is a Gram (g)?

A gram is the base unit of the metric system. It is used worldwide because it is more accurate for small measurements. It is much smaller than an ounce.

• 1 gram = 0.035274 ounces
• 1,000 grams = 1 kilogram (kg) – about 2.2 pounds.

Grams are part of the metric system; they are commonly used for measuring small or lightweight items, especially in cooking, food packaging, science, and everyday measurements.

Where you’ll see grams in the USA:

• Nutrition labels:
  • All FDA food labels list serving sizes in grams (e.g., “Total Fat 12g”).

• Science & medicine:
  • Lab measurements, prescriptions, and supplement use use grams and milligrams.

• Jewellery:
  • Gems and small precious metals are often weighed in grams (not troy ounces).

• Imported goods:
  • Many packaged foods from Europe, Asia, and elsewhere show grams prominently.

• Fitness:
  • Protein powders, pre-workouts, and supplements measure scoops in grams.

Ounces to Grams Formula

The math is simple. You only need to remember one number. To convert ounces (oz) to grams (g), multiply the number of ounces by 28.3495.

Multiply any ounce value by 28.3495 to get grams.

Examples:

• To convert 5 ounces to grams:
  • 5 × 28.3495 = 141.7475 grams
  • So, 5 oz = 141.7475 g, or approximately 141.75 grams.

• To convert 8 ounces to grams:
  • 8 × 28.3495 = 226.7962 grams
  • So, 8 oz = 226.7962 g, or approximately 226.80 grams.

If you want to convert grams back to ounces:

• To convert 100 grams to ounces:
  • 100 ÷ 28.3495 = 28.2192 ounces
  • So, 100 grams = 28.2192 ounces, or approximately 28.22 ounces.

How to Convert Ounces to Grams – Step by Step

Converting ounces to grams is straightforward. For regular weight ounces, use the conversion factor 1 ounce = 28.3495 grams.

Let’s convert the most common USA example. Just follow these simple steps:

• 16 oz to grams (which is 1 pound).
  • Step 1: Take your ounces value: 16 oz
  • Step 2: Multiply it by 28.3495.
  • Step 3: 16 × 28.3495 = 453.592

Result: 16 oz = 453.59 grams. That’s why 1 pound = 453.59 grams.

• Convert 8 ounces to grams:
  • Step 1: Take your ounces value: 8 oz
  • Step 2: Multiply it by 28.3495.
  • Step 3: 8 × 28.3495 = 226.7962

Result: 8 oz = 226.7962 grams. (Rounded-226.80 g)

Ounces to Grams Conversion Table

For regular weight ounces (avoirdupois ounces), 1 oz = 28.349523125 grams.

The table below rounds the results to two decimal places, making it easy to read and useful for everyday measurements, cooking, food packaging, and other common conversions.

Ounces (oz)	Grams (g)
0.5 oz	14.17 g
1 oz	28.35 g
2 oz	56.70 g
4 oz	113.40 g
5 oz	141.75 g
6 oz	170.10 g
7 oz	198.45 g
8 oz	226.80 g
12 oz	340.19 g
16 oz	453.59 g
24 oz	680.39 g
32 oz	907.19 g
40 oz	1,133.98 g
48 oz	1,360.78 g
64 oz	1,814.37 g
100 oz	2,834.95 g

Real-Life Examples for USA

Here are real-life, practical examples of ounces to grams from everyday life in the USA, where ounces are used daily but many products (especially imports) show grams.

Here are some common examples:

Item	Ounces	Grams
snack package	1 oz	28.35 g
Chocolate bar	3.5 oz	99.22 g
Butter (1 stick)	4 oz	113.40 g
Cheese	8 oz	226.80 g
Ground coffee	12 oz	340.19 g
Bag of nuts	16 oz	453.59 g
Packaged meat	20 oz	566.99 g

• Cooking Example: 8 oz to Grams
  • Your cheesecake recipe says 8 oz cream cheese.
  • In the kitchen, that’s 8 oz of flour.
  • 8 × 28.3495 = 226.79 grams (round to 227 g).

• Coffee Example: 12 oz Coffee to Grams
  • You bought a 12 oz bag of Starbucks coffee.
  • 12 × 28.3495 = 340.19 grams
  • That’s 340.19 grams.

• Protein Powder (Gym Supplements)
  • Your whey protein scoop says “1 scoop = 1.1 oz.”
  • 1.1 × 28.3495 = 31.2 grams.

• Meat & Gym Example:
  • 16 oz Steak to Grams
  • 16 × 28.3495 = 453.59 grams.
  • A 16 oz ribeye steak is 453.59 grams.

Why Do Americans Need Oz to G?

Although ounces are commonly used in the United States, grams keep appearing on everything from nutrition labels to postal forms. This forces Americans to convert constantly.

• Baking: European recipes are in grams and are 10x more accurate than cups/ounces.
• Many recipes from outside the USA list ingredients in grams.
• Some food labels, nutrition information, or imported products use grams.
• Fitness: Macros tracking apps like MyFitnessPal use grams.
• Jewelry: Gold price is per gram internationally.
• USPS, FedEx, and UPS require grams for international labels.
• Coffee: Specialty coffee recipes always use grams.
• Veterinary and compounded prescriptions are dosed in milligrams per gram.
• Imported products may show weight in grams instead of ounces.

A fluid ounce of honey weighs more than a fluid ounce of water, but a gram is always a gram.

Frequently Asked Questions