Convert between grams and ounces for weight measurements. Essential for cooking, baking, postal shipping, and everyday weight conversions.
Last updated: March 2026 | By Patchworkr Team
Grams (g) and ounces (oz) are both units of weight/mass. The gram is part of the metric system (SI), while the ounce is part of the imperial system used primarily in the United States.
One ounce equals exactly 28.349523125 grams, commonly rounded to 28.35 grams for everyday use. The conversion is based on the international avoirdupois ounce, which is the standard ounce used for most purposes (not to be confused with troy ounces used for precious metals).
Grams are preferred in scientific, medical, and most international contexts due to the simplicity of the metric system. Ounces remain common in the US for food packaging, postal rates, and everyday weight measurements.
Divide the number of grams by 28.349523125 to get ounces. For example, 100 grams ≈ 3.527396 ounces.
Multiply the number of ounces by 28.349523125 to get grams. For example, 5 ounces = 141.747616 grams.
One ounce (avoirdupois) equals exactly 28.349523125 grams. For practical purposes, this is commonly rounded to 28.35 grams.
A regular (avoirdupois) ounce is 28.349523125 grams, used for general purposes. A troy ounce is about 31.1034768 grams, used for precious metals. This calculator uses avoirdupois ounces.
Many US recipes use ounces because the imperial system is still common in American cooking. Professional bakers and international recipes prefer grams for precision and ease of scaling.
Fluid ounces measure volume, not weight. To convert, you need the substance density. For water, 1 US fluid ounce weighs about 29.57353 grams.
For water, approximately yes. But grams measure mass while milliliters measure volume, so the relationship changes with density.
Cooking and baking, postal shipping, nutrition labels, jewelry, small package weighing, medication contexts, and international commerce.
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