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Weight and mass unit converter

The weight converter instantly transforms between kilograms, pounds, grams, ounces, metric tons, and more. It's essential for international shopping, cooking recipes in imperial units, body weight tracking with devices in pounds, postal shipping, and any context where the International System (SI) and imperial system coexist.

Weight conversion factors

• 1 kilogram (kg) = 1,000 g = 2.2046 lb = 35.274 oz
• 1 pound (lb) = 453.592 g = 0.4536 kg = 16 oz
• 1 ounce (oz) = 28.3495 g = 0.0625 lb
• 1 metric ton (t) = 1,000 kg = 2,204.6 lb
• 1 US short ton = 907.185 kg = 2,000 lb

Conversion examples

75 kg to pounds (body weight):
75 × 2.2046 = 165.3 lb

12 oz to grams (cooking recipe):
12 × 28.3495 = 340.2 g

3 lb 5 oz to kilograms:
(3 × 453.592 + 5 × 28.3495) / 1000 = 1.502 kg

When you need to convert weight units

• Anglo-American cooking: US and UK recipes use oz, lb, and cups. This calculator converts directly to grams without memorizing tables.
• International online shopping: Maximum shipping weight expressed in pounds on US sites, converted to kg to compare with your scale.
• Fitness and nutrition: Kitchen scales and apps like MyFitnessPal can show both grams and oz — convert instantly.
• Transport and logistics: Customs, courier services, and air freight mix kg and lb in their tariffs.
• Veterinary medicine: Drug doses expressed in mg/lb converted to mg/kg to calculate dosage from the animal's metric weight.

Mass vs Weight: the technical difference

Technically, mass (kg) is the amount of matter, while weight is the gravitational force on that mass (newtons). On Earth, 1 kg of mass has a weight of 9.81 N. In everyday language, however, "weight" refers to mass — and this calculator operates on that common convention.