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The troy ounce (31.1035g) predates the avoirdupois ounce (28.3495g) and was used for precious items. When standardizing weights, precious metal markets kept troy ounces to avoid disrupting global trading systems. Everything else uses avoirdupois ounces. Always verify which system when dealing with metals.

For recipes, use 28.35g per ounce. Common conversions: 1 oz = 28.35g, 4 oz = 113g (1 stick butter), 8 oz = 227g (1 cup water). Digital kitchen scales often have an oz/g button. For best results, weigh ingredients rather than using volume measurements.

Think '28 and a third' grams per ounce. For quick estimates, 30g ≈ 1 oz gives only 5.8% error. For precise work, remember 28.35. Some memorize that 1 pound = 454 grams, then divide by 16 for ounces.

Yes! USPS rounds UP to the next ounce, while many international services use exact grams. A 1.1 oz letter costs the 2 oz rate in the US but might fit the 31g rate internationally. Always round up for safety and check specific postal service rules.

Supplements often list both: '5g (0.18 oz)' per serving. For precise dosing, use grams. Common: protein powder scoop = 30g ≈ 1.06 oz, creatine = 5g = 0.18 oz. Medical dosing uses milligrams (mg), where 1000mg = 1g = 0.035 oz.