A normal US pound of sugar would weigh approximately how much in troy ounces?

Troy weight is a system of units of mass customarily used for precious metals and gemstones. One troy ounce (abbreviated "t oz" or "oz t") is equal to 31.1034768 grams, (or about 1.0971 oz. avoirdupois, the "avoirdupois" ounce being the most common definition of an "ounce" in the US).

The troy ounce, then, is about 10% heavier (ratio 192/175) than the avoirdupois ounce. Although troy ounces are still used to weigh gold, silver, and gemstones, troy weight is no longer used in most other applications.

The troy pound is 5 760 grains (12 oz t), while an avoirdupois pound is approximately 21.53% heavier. This makes a standard pound of sugar heavier than a troy pound of gold.