Weight Converter
Convert between metric and imperial weight units instantly.
Quick Reference
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This tool is for informational and educational purposes only. It is not a substitute for professional financial, medical, legal, or engineering advice. See Terms of Service.
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This converter translates weight and mass measurements between eight common metric and imperial units. Whether you are following a recipe from another country, tracking fitness goals, shipping a package, or doing science homework, this tool gives you an accurate answer instantly.
- Enter a value. Type the number you want to convert into the value field. It accepts whole numbers and decimals.
- Choose the source unit. Open the "From" dropdown and pick the unit your original measurement uses. Options include milligrams, grams, kilograms, metric tons, ounces, pounds, stones, and US tons.
- Choose the target unit. Open the "To" dropdown and select the unit you need. The result updates automatically as you type or change selections.
- Use the swap button. Click the arrow button between the dropdowns to reverse the conversion direction without retyping anything.
Below the main result you will see a formula line showing the exact relationship between the two units and a quick-reference table with common values already converted. Use the Copy button to grab the result or the Share button to send a link with your inputs pre-filled.
About Weight Conversion
The metric system measures mass in grams and its multiples: milligrams for tiny amounts, kilograms for everyday weights, and metric tons for heavy loads. The imperial system uses ounces, pounds, and tons. Stones are still used in the United Kingdom and Ireland, especially for body weight.
This converter works by first translating your input into grams (the CGS base unit for mass), then converting from grams to the target unit. The conversion factors follow internationally standardized definitions: one pound is exactly 453.59237 grams, one ounce is exactly 28.3495231 grams, one stone is 14 pounds (6,350.29318 grams), and one US short ton is 2,000 pounds (907,184.74 grams). A metric ton is exactly 1,000 kilograms or 1,000,000 grams.
Frequently Asked Questions
How many pounds are in a kilogram?
One kilogram equals approximately 2.2046 pounds. To convert kilograms to pounds, multiply by 2.2046. For a quick mental estimate, double the kilogram value and add 10 percent. For example, 70 kg is roughly 154 pounds.
How many grams are in an ounce?
One avoirdupois ounce equals approximately 28.3495 grams. This is the standard ounce used for food labels, cooking, and general weight measurement. A troy ounce, used for precious metals, is slightly heavier at 31.1035 grams. This converter uses the avoirdupois ounce.
What is a stone and how many pounds does it equal?
A stone is an imperial unit of weight equal to 14 pounds or approximately 6.35 kilograms. It is commonly used in the United Kingdom and Ireland to express body weight. For example, a person weighing 150 pounds weighs about 10 stone 10 pounds (often written 10st 10lb).
What is the difference between a metric ton and a US ton?
A metric ton (also called a tonne) equals 1,000 kilograms or about 2,204.6 pounds. A US short ton equals 2,000 pounds or about 907.18 kilograms. The metric ton is roughly 10 percent heavier than the US ton. There is also a long ton (imperial ton) of 2,240 pounds, used in British shipping, though it is less common today.