Weight Converter
Weight Converter is a free converters tool that runs directly in your browser with no account required.
About this tool
Convert between kilograms, grams, pounds, and ounces using the exact avoirdupois definitions rather than the rounded 2.2 shortcut. Every input is normalized to grams, with one pound defined as exactly 453.59237 grams, so recipe scaling, shipping weights, and fitness numbers come out accurate to six decimal places.
How to use
- Enter the weight in the Amount field.
- Pick the current unit under From: Kilograms, Grams, Pounds, or Ounces.
- Pick the target unit under To and read the converted value.
Frequently asked questions
What conversion factors are used?
One pound is exactly 453.59237 grams and one ounce is 28.349523125 grams, the international avoirdupois definitions. Kilograms and grams relate by a factor of 1,000, and all conversions pass through grams.
Why does 1 kg show as 2.204623 lb instead of 2.2?
2.2 is a convenience approximation. The exact value is 1,000 divided by 453.59237, which is about 2.20462, and this tool reports the precise figure to six decimal places.
Are these fluid ounces?
No. This converter handles weight ounces (avoirdupois); fluid ounces measure volume and cannot be converted to weight without knowing the substance's density.
Does it handle troy ounces for precious metals?
No, only standard avoirdupois ounces. A troy ounce is heavier at about 31.103 grams, so do not use this tool for gold or silver weights.
Can I convert very small or very large amounts?
Yes. The Amount field accepts decimals, so you can convert 0.5 g just as easily as 25,000 kg, with the same underlying factors applied.