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⚖️ Weight Converter

Convert between kilograms, pounds, ounces, grams, stones, metric tons, carats and more — instantly and accurately.

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Unit Reference
Metric mg, g, kg, t, mcg
Imperial oz, lb, st, ton (US), ton (UK)
Troy troy oz, troy lb, dwt, grain
Scientific atomic mass unit, dalton, slug
Everyday carat, tael, catty, jin
Common Conversions
1 kg = 2.20462 lb
1 lb = 453.592 g
1 oz = 28.3495 g
1 stone = 6.35029 kg
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About Weight & Mass Measurement

Metric System

The metric system uses grams (g) and kilograms (kg) as primary units. Based on powers of 10: 1 kg = 1000 g = 1,000,000 mg. Metric tons (1000 kg) are used for large masses. The SI base unit is the kilogram.

Imperial & US Units

Pounds (lb) and ounces (oz) are standard in the US and UK. 1 lb = 16 oz = 453.592 g. Stones (14 lb) are used in UK for body weight. US tons (short ton = 2000 lb) differ from UK long tons (2240 lb).

Troy Weight

Troy units are used for precious metals like gold and silver. 1 troy ounce = 31.1035 g, which is heavier than an avoirdupois ounce (28.35 g). Gold prices are always quoted per troy ounce globally.

Weight vs Mass

Technically, mass (kg) measures matter, while weight (N) is a force due to gravity. In everyday use they're treated interchangeably. On the Moon, your mass stays the same but your weight drops to ~1/6th of Earth value.