Weight & Mass Converter
Enter one weight or mass value and instantly see useful equivalents in metric, imperial, and US customary units.
Browse conversion tools
This page uses HandyCalcHub's shared conversion engine. Visit the Converters hub to see current and future converter categories.
What this converter does
The Weight & Mass Converter changes one entered value into several common units at the same time. It supports milligrams, grams, kilograms, metric tonnes, ounces, pounds, stones, and US short tons.
How weight and mass conversion works
Each unit is converted through a shared base unit: grams. For example, pounds convert to grams using the exact relationship 1 pound = 453.59237 grams. The result is then converted from grams into each target unit.
In everyday language, weight is often used for values like pounds or kilograms. Technically, mass measures how much matter something has, while weight depends on gravity. For daily unit conversion, the practical arithmetic is the same.
Worked example
If you enter 150 pounds, the converter first turns that value into 68,038.8555 grams. From there it can show 68.0388555 kilograms, 2,400 ounces, and about 10.7142857 stones.
Useful conversion relationships
| Relationship | Value |
|---|---|
| 1 pound | 16 ounces |
| 1 pound | 453.59237 grams |
| 1 kilogram | 1,000 grams |
| 1 kilogram | about 2.2046226218 pounds |
| 1 stone | 14 pounds |
| 1 US short ton | 2,000 pounds |
| 1 metric tonne | 1,000 kilograms |
When weight conversions are useful
Weight and mass conversions are useful for recipes, shipping labels, gym weights, product specs, school assignments, travel baggage limits, nutrition labels, and comparing values from countries that use different unit systems.
Frequently asked questions
How many ounces are in a pound?
There are exactly 16 ounces in one pound.
How many grams are in a pound?
One pound is exactly 453.59237 grams.
Is weight the same as mass?
In everyday use, people often say weight when comparing pounds or kilograms. Technically, mass is the amount of matter, while weight depends on gravity.
Can this converter handle decimal or negative values?
Yes. Decimal and negative values calculate normally, which can be useful for math checks, differences, or offsets.