Use this weight converter to quickly convert between common weight and mass units, including kilograms, grams, milligrams, metric tons, pounds, ounces, and stones.
Weight conversion is useful when comparing measurements from different countries, reading product labels, preparing shipments, following recipes, tracking fitness numbers, or working with school and science assignments.
Conversions use standard SI and avoirdupois unit definitions. 1 lb = 0.45359237 kg (exact). 1 stone = 14 lb. Tons shown are metric tons (1,000 kg).
How to Use This Tool
- Enter the weight value you want to convert.
- Choose the original unit.
- Review the converted values in the other supported units.
- Change the input value to compare another measurement.
Supported Weight Units
Kilograms (kg)
Kilograms are commonly used for body weight, shipping weight, fitness tracking, product weight, and general metric measurements.
Grams (g)
Grams are commonly used for food, recipes, nutrition labels, small packages, and science measurements.
Milligrams (mg)
Milligrams are used for very small weights, such as supplement amounts, medication labels, chemical measurements, and precise product details.
Metric Tons (t)
Metric tons are used for very large weights. One metric ton equals 1,000 kilograms.
Pounds (lb)
Pounds are commonly used in the United States for body weight, shipping, groceries, luggage, and everyday measurements.
Ounces (oz)
Ounces are used for smaller weights, food portions, postal weight, and product packaging.
Stones (st)
Stones are commonly used in the United Kingdom and Ireland for body weight. One stone equals 14 pounds.
Common Uses
You can use this weight converter for:
- Converting pounds to kilograms
- Converting kilograms to pounds
- Converting grams to ounces
- Converting ounces to grams
- Converting stones to pounds
- Checking food and recipe measurements
- Estimating shipping weight
- Understanding product labels
- Comparing fitness or body weight measurements
- Converting school or science measurements
Example
If a package weighs 5 pounds and you need the weight in kilograms, enter 5 and choose pounds. The converter will show the equivalent value in kilograms and other supported units.
If a recipe lists 250 grams and you want to convert it to ounces, enter 250 and review the ounce conversion.
Important Conversion Notes
This converter uses standard SI and avoirdupois unit definitions. One pound equals exactly 0.45359237 kilograms. One stone equals 14 pounds. Metric tons refer to metric tons, where one metric ton equals 1,000 kilograms.
Why Weight Conversion Matters
Weight and mass units vary depending on country, industry, and context. A product sold internationally may show kilograms, while a U.S. shipping label may use pounds and ounces. Recipes may use grams, while fitness trackers may use pounds or kilograms.
A weight converter helps avoid confusion and makes it easier to compare values across different measurement systems.
Frequently Asked Questions (FAQs)
Is weight the same as mass?
In everyday use, people often say “weight” when they mean mass. Technically, mass measures the amount of matter, while weight depends on gravity. For everyday conversions, these units are commonly converted as weight or mass measurements.
How many grams are in one kilogram?
There are 1,000 grams in one kilogram.
How many ounces are in one pound?
There are 16 ounces in one pound.
How many pounds are in one stone?
There are 14 pounds in one stone.
What is a metric ton?
A metric ton equals 1,000 kilograms.
Can I use this for medical dosage?
No. Do not rely on a general converter for medication dosage or medical decisions. Always follow professional medical guidance and official medication instructions.
Disclaimer
This weight converter is provided for general informational and convenience purposes only. It should not be used as a substitute for professional, medical, scientific, commercial, shipping, or legal measurement verification. Always confirm important measurements with qualified professionals or official requirements.