Convert Ounces to Grams

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oz
28.3495
g
Formula: Grams = Ounces × 28.3495

Common Conversions

Ounces (oz)Grams (g)
0.257.0874
0.514.1747
128.3495
1.542.5242
256.6990
385.0485
4113.40
5141.75
6170.10
7198.45
8226.80
10283.50
12340.19
14396.89
16453.59
20566.99
24680.39
32907.18
481360.78
641814.37

What Is Ounces TO Grams?

One ounce equals approximately 28.3495 grams. This conversion is fundamental in cooking, baking, nutrition labeling, and precious metals trading. When following a European recipe that lists flour in grams while your kitchen scale reads ounces, this factor bridges the gap perfectly. The US nutrition facts panel lists serving sizes in grams, so anyone tracking macronutrients needs to convert ounce-measured portions frequently. In the precious metals market, a troy ounce (31.1035 g) differs from the avoirdupois ounce used here, so context matters. The 28.3495 factor originates from the avoirdupois system where 1 pound equals 16 ounces and 453.592 grams, giving each ounce exactly 453.592 / 16 = 28.3495 grams.

Formula

Multiply the ounce value by 28.3495 to convert to grams. Since 1 pound = 453.592 grams and 1 pound = 16 ounces, each ounce contains 453.592 / 16 = 28.3495 grams. For example, 4 oz times 28.3495 equals 113.40 grams.

Best For:

  • Converting recipe ingredient amounts from ounces to grams for precise baking
  • Reading and comparing nutrition labels that list values in grams
  • Weighing precious metals and gemstones for jewelry crafting
  • Portioning food for meal prep using a gram-based kitchen scale
  • Calculating postage costs when letter weight is measured in ounces but limits are in grams

How to Ounces TO Grams

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Frequently Asked Questions

One avoirdupois ounce equals approximately 28.3495 grams. Note that a troy ounce, used for precious metals, equals 31.1035 grams.
No. A fluid ounce measures volume (approximately 29.57 mL), while an ounce (oz) measures weight (28.35 g). They are different units despite sharing a name.
A rough shortcut: multiply by 28. For more precision, multiply by 28 and then add 1% of the result. For 5 oz: 5 x 28 = 140, plus 1.4 = 141.4 g (actual: 141.75 g).
The US customary system inherited ounces from British imperial measurement. Most other countries adopted the metric system, making grams the standard for kitchen scales and recipes.
100 grams equals approximately 3.527 ounces. This is a common reference point since many nutrition labels use 100 g servings.