While these conversions are not 100% mathematically correct, the simplified equations will work in most recipes.
See also Simple Volume Measures

1/4 ounce = 7 grams

1/2 ounce = 15 grams

3/4 ounce = 21 grams

1 ounce = 28 grams

1 1/4 ounces = 35 grams

1 1/2 ounces = 42.5 grams

1 2/3 ounces = 45 grams

2 ounces = 57 grams

3 ounces = 85 grams

4 ounces (1/4 pound) = 113 grams

5 ounces = 142 grams

6 ounces = 170 grams

7 ounces = 198 grams

8 ounces (1/2 pound) = 227 grams

12 ounces (3/4 pound) = 340 Grams

16 ounces (1 pound) = 454 grams

32.5 ounces (2.2 pounds) = 1 kilogram