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One value, every weight unit, live.
Everything converts through grams: 1 pound = 453.59237 g exactly, 1 ounce = 28.349523125 g. Kilograms are the SI base unit of mass; pounds and ounces are legally defined in metric terms. Worked example: 180 lb × 453.59237 = 81,646.6 g = 81.65 kg.
2.20462 lb. Quick estimate: double it and add 10% (70 kg → 140 + 14 = 154 lb).
Mass (kg) is how much matter; weight is the gravitational force on it. Scales read mass by measuring weight — on the Moon you would weigh less but your mass is unchanged.
16 ounces exactly.