Weight Converter

Convert between kilograms, pounds, ounces, grams, and more. Free online weight and mass converter.

What is Weight Converter?

A weight converter transforms measurements between different units of mass, including metric units (grams, kilograms, metric tons) and imperial units (ounces, pounds, stones, tons). Whether you're tracking your body weight, shipping packages internationally, or working with recipes from different countries, accurate weight conversions are essential.

The metric system uses grams and kilograms as its base units, with clean decimal relationships. The imperial system uses ounces, pounds, and tons, which are still standard in the United States. Understanding the relationship between these systems helps in everything from cooking to international trade.

Formula

Key conversion factors:

1 ounce = 28.3495 grams

1 pound = 453.592 grams = 0.453592 kg

1 stone = 6.35029 kg = 14 pounds

1 metric ton = 1,000 kg

1 US ton = 2,000 pounds = 907.185 kg

How to Calculate

Select the source weight unit.
Select the target weight unit.
Enter the value to convert.
View the converted result.
See equivalent values in all available units.

Example

Converting 150 pounds to kilograms: 150 × 0.453592 = 68.04 kg. Converting 5 kg to pounds: 5 × 2.20462 = 11.02 lbs. A person weighing 12 stone 7 pounds weighs approximately 175 pounds or 79.38 kg.

Key Benefits

Convert kg lbs ounces stones grams instantly
Track fitness in preferred unit system
Eliminate recipe confusion across countries
Handle grams to tons in one tool

Common Mistakes to Avoid

Confusing pounds-mass with pounds-force
US tons vs metric tonnes different
Stone equals 14 pounds in UK

Pro Tips

1 kg roughly 2.2 pounds for estimates
Stick with one system for consistency
1 gram weight of paperclip reference

Key Terms Explained

Kilogram: Base SI unit of mass
Pound: 16 ounces 0.453592 kg
Tonne: 1000 kilograms metric ton
Ounce: Food and precious metals unit

When to Use This Calculator

International recipe conversions
Body weight or shipping weights
Product spec conversions

Common Use Cases

Converting body weight between pounds and kilograms for health tracking
Calculating shipping weights for international packages
Converting recipe ingredients between metric and imperial
Understanding product weights when shopping internationally

Frequently Asked Questions

What's the difference between weight and mass?

Mass is the amount of matter in an object and doesn't change. Weight is the force of gravity on that mass and varies by location. On Earth, we use them interchangeably in everyday contexts.

What's a stone?

A stone is a British unit of weight equal to 14 pounds or approximately 6.35 kg. It's commonly used in the UK to express body weight but rarely used elsewhere.

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