What is the Ounces to Grams Calculator?
This free tool converts a weight given in ounces (oz) into grams (g), the standard metric unit of mass. It is handy for cooking, baking, shipping, postage, science experiments, and any situation where a recipe or specification mixes imperial and metric units. The conversion is universal and applies everywhere.
How to use it
Enter the number of ounces you want to convert and the calculator instantly displays the equivalent in grams, plus a kilogram value for larger quantities. You can use decimals such as 2.5 oz for partial measurements.
The formula explained
One avoirdupois ounce is defined as exactly 28.349523125 grams, commonly rounded to 28.3495 g. To convert, simply multiply:
$$\text{grams} = \text{ounces} \times 28.3495$$
For kilograms, divide the resulting grams by 1000.
Worked example
Suppose you have 16 ounces (one pound). Multiply: $$16 \times 28.3495 = 453.592 \text{ grams}.$$ That equals 0.4536 kg, which matches the well-known fact that one pound is roughly 454 grams.
FAQ
How many grams are in an ounce? There are 28.3495 grams in one avoirdupois ounce.
Is this the same as a fluid ounce? No. A fluid ounce measures volume, not weight. This calculator converts ounces of mass to grams.
How do I convert grams back to ounces? Divide the gram value by 28.3495. For example, \(100 \text{ g} \div 28.3495 \approx 3.53 \text{ oz}\).
