Weight converter
Convert common mass units.
Weight converter
Your result appears here
Adjust the values to see your result automatically.
How to use Weight converter
The Weight converter turns a mass in one unit into another and shows the exact one-unit factor used. Units include kilograms, grams, milligrams, metric tonnes, pounds, ounces, stone, US short tons and UK long tons. The pound is fixed at 0.45359237 kg, and results can be shown with 1 to 15 significant digits in grouped, plain or scientific form.
- Adjust the values; an initial result is calculated from the defaults.
- Change the basic settings or open Advanced mode to fine-tune the result.
- Review and copy or download your result. Pause Live results to run manually. Sources or individual settings above 20,000 characters require an explicit run.
What this tool supports
Convert common mass units.
- Value
- Set this value for your task.
- From
- kg · g · mg · metric tonne · lb · oz · US short ton · UK long ton · stone
- To
- kg · g · mg · metric tonne · lb · oz · US short ton · UK long ton · stone
- Significant digits
- Range: 1 to 15
- Number display
- Standard (grouped) · Plain (no grouping) · Scientific notation
Limits and processing
Use finite numbers, valid dates and the ranges shown by each control. Invalid values produce an error without a downloadable result.
Frequently asked questions
How many kilograms are in a pound?
One pound is exactly 0.45359237 kilograms, the international avoirdupois definition used by this converter. One ounce is 0.028349523125 kg, which is one sixteenth of that pound, and one stone is 6.35029318 kg, or 14 pounds.
What is the difference between a short ton, a long ton and a metric tonne?
They are three different masses. The converter uses 907.18474 kg for a US short ton, 1,016.0469088 kg for a UK long ton and 1,000 kg for a metric tonne, and it warns you when a ton or tonne unit is part of the conversion.
Is the ounce in this converter a fluid ounce?
No. The ounce here is a mass ounce of 28.349523125 grams, not a volume measure. To convert fluid ounces, use a volume or cooking converter instead, since a fluid ounce of liquid only has a mass once you know its density.
Where is my input processed?
This operation processes its source in your browser. Copy and download are explicit actions; source input is not saved in an account or history.
What are the input limits?
Use finite numbers, valid dates and the ranges shown by each control. Invalid values produce an error without a downloadable result.