Weight (mass) is measured using many different units.
You can convert mass measured in one unit to another unit by clicking Utilities and then Conversions.
Holding the Control key and typing q has the same result.
In the Conversions window select Mass.
Click the unit you have in the Units From: box, and the units you want in the Units To: box.
Enter the number in the lower left box and click Convert.
This window shows that 1 ounce is 28.349 523 125 grams.
The conversions are based on:
1 Kilogram = 1000 grams
1 gram = 1000 milligrams
1 carat = 200 milligrams
1 pound = 16 ounces = 453.592 37 grams
1 stone = 14 pounds
1 short ton = 2000 pounds
1 long ton = 2240 pounds
1 metric ton (or tonne) = 1000 kilograms
1 Troy ounce = 31.103 476 8 grams