Weight Converter

1 lb = 0.45359237 kg · 1 oz = 28.3495 g · 1 kg = 1000 g

Weight & Mass

How to Use This Tool

All-in-One Weight Conversion

The Weight Converter handles every common unit of mass and weight in a single tool. Type a value in any unit and instantly see the equivalent in every other supported unit.

Supported Units

  • Metric: milligram (mg), gram (g), kilogram (kg), metric ton (t)
  • Imperial: ounce (oz), pound (lb), US ton (ton)

All conversions use the international standard: 1 pound = 0.45359237 kg exactly, 1 ounce = 28.349523125 g exactly.

Formula & Explanation

All weight conversions use the international avoirdupois system. The pound is defined as exactly 0.45359237 kilograms by an international agreement in effect since 1959.

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Frequently Asked Questions

What's the difference between a metric ton and a US ton?

A metric ton (tonne) is 1000 kilograms. A US ton (short ton) is 2000 pounds, which equals 907.185 kg. A UK long ton is 2240 pounds or 1016.05 kg. Our converter uses the US ton by default.

Is the pound-to-kilogram factor exact?

Yes. Since 1959, the international avoirdupois pound has been defined as exactly 0.45359237 kilograms. This is the definition used in the US, UK, Canada, Australia, and most other countries.