BCBetter Calculators

Ounces to Grams Calculator

Convert ounces to grams for cooking, nutrition, and shipping.

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Enter your values and click Calculate

How It Works

The calculator multiplies your ounce value by 28.3495, which is the internationally defined mass of one avoirdupois ounce in grams (the full precise value is 28.349523125 g). Multiplying the number of ounces by this factor gives the gram equivalent to four decimal places. The conversion is exact by definition — the gram and the avoirdupois ounce are both part of the unified international system of weights formalised in the 1959 international yard and pound agreement, so there is no approximation involved in the relationship between them. Note that this calculator uses avoirdupois ounces, the everyday unit used for food and general goods. Troy ounces — used for precious metals — are heavier at 31.1035 grams each and should not be used with this conversion.

Examples

Half Cup of Flour
A half cup of all-purpose flour weighs about 2 oz.
Result: 2 ounces equals approximately 56.699 grams.
One Pound
There are 16 ounces in a pound — converting to grams.
Result: 16 ounces equals approximately 453.592 grams.
Protein Bar
A typical protein bar weighs about 2.5 oz.
Result: 2.5 ounces equals approximately 70.874 grams.

Frequently Asked Questions

How many grams are in an ounce?
One avoirdupois ounce equals exactly 28.3495 grams.
What is the difference between a dry ounce and a fluid ounce?
A dry ounce measures mass (weight), while a fluid ounce measures volume. This calculator uses dry ounces.
How do I convert pounds to grams?
First multiply your pounds by 16 to get ounces, then multiply by 28.3495. Or simply multiply your pounds by 453.592 directly.

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