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To convert pounds to ounces, multiply by 16. There are exactly 16 ounces in one pound — a ratio unchanged since the medieval English trading system. So 2 lbs = 32 oz, 2.5 lbs = 40 oz, and 0.5 lbs = 8 oz. No decimal conversions needed: it's always a factor of 16.
Pounds and ounces coexist daily in American life. A newborn weighs 7 lbs 4 oz. A stick of butter is 4 oz (0.25 lbs). A can of soup is typically 10.5 oz. Recipes, nutrition labels, and package weights regularly split weight across both units, making fluency in the conversion important.
Did you know? The 16-ounce pound dates from the Roman "libra," from which we get the abbreviation "lb." Ancient Romans divided the libra into 12 uncia (ounces), but the English system later settled on 16 ounces per pound for trade goods.
Pediatric growth charts track infant weight in pounds and ounces. Food packaging for deli items, butter, and cheese uses ounces. Postal services charge by the ounce for letters and small packages. Bakers switching from block recipes (in lbs) to portioned recipes (in oz) need this conversion.