Conversion Calculator
Weight Converter
Convert between kilograms, pounds, ounces, grams, stone, and tons instantly with step-by-step explanations.
Enter Values
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The guide, formula, examples, and FAQ are available below.
How to Use This Calculator
Enter Value
Type your value into the input field. For example: e.g., 100. Minimum value: 0.
Select From
Choose the appropriate option from the "From" dropdown. Options include: Kilograms (kg), Pounds (lb), Ounces (oz), Grams (g), Stone (st), Metric Tons (t).
Select To
Choose the appropriate option from the "To" dropdown. Options include: Kilograms (kg), Pounds (lb), Ounces (oz), Grams (g), Stone (st), Metric Tons (t).
View Your Result
The result appears beside the calculator with the main answer and a detailed calculation breakdown.
Adjust and Explore
Change any input value and calculate again. Use the copy and share controls to save or send your result.
On this page
Formula
All weight conversions use kilograms as an intermediate base unit. The input value is first converted to kilograms, then from kilograms to the target unit using precise conversion factors.
Unit conversion note
Conversion calculators use standard metric, imperial, and US customary relationships.
Cooking and regional units may vary, so check the unit system shown on the calculator before relying on a result.
Source and review references
Last reviewed by the Calculator Trust Editorial Team. To report an issue, email contact [at] calculatortrust.com.
Common Examples
Understanding the Concept
Weight conversion is essential in cooking, science, shipping, fitness, and everyday life. Different countries and industries use different units, from metric kilograms and grams to imperial pounds, ounces, and stone. This converter handles all common weight units with precise conversion factors, making it easy to switch between measurement systems.
Common Weight Units Explained
- Kilogram (kg): The SI base unit of mass, used worldwide in science and most countries for everyday measurements. Equal to 1,000 grams.
- Pound (lb): The primary unit of weight in the United States and a few other countries. One pound equals approximately 0.4536 kilograms.
- Ounce (oz): Commonly used in the U.S. for food and small items. There are 16 ounces in a pound.
- Gram (g): A metric unit equal to one-thousandth of a kilogram. Widely used in cooking, nutrition, and science.
- Stone (st): A traditional British unit still used in the UK and Ireland for body weight. One stone equals 14 pounds or about 6.35 kilograms.
- Metric Ton (t): Equal to 1,000 kilograms or about 2,204.6 pounds. Used for large-scale measurements in shipping and industry.
Key Conversion Factors
Here are the most commonly needed weight conversion factors:
- 1 kg = 2.20462 lb
- 1 lb = 16 oz = 453.592 g
- 1 stone = 14 lb = 6.35029 kg
- 1 metric ton = 1,000 kg = 2,204.62 lb
- 1 oz = 28.3495 g
When You Need Weight Conversions
Weight conversions come up in many everyday situations:
- Cooking: International recipes may use grams while American recipes use ounces and pounds.
- Fitness: Gym equipment may be labeled in kilograms or pounds depending on the country.
- Travel: Airline baggage limits are often in kilograms, while Americans think in pounds.
- Shipping: Package weights may need to be converted between metric and imperial systems for international logistics.
Frequently Asked Questions
How many pounds are in a kilogram?
What is the difference between a metric ton and a US ton?
How many stone do I weigh?
Is mass the same as weight?
Learn More
Written and reviewed by Calculator Trust Editorial Team
Our calculators are built using verified formulas from academic, government, and scientific sources. Content is fact-checked and reviewed for accuracy.