Free Weight Converter
Convert between mg, g, kg, ton, oz, lb, and stone.
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Short answer
Convert to kilograms as a pivot. 1 pound = 0.45359237 kg exactly.
What is the Weight Converter?
Two-way mass conversions across the seven most common metric and imperial units.
How does the Weight Converter work?
Multiply the source value by its kg factor, then divide by the target's kg factor.
Formula
Variables
→kg factorNumber of kilograms in one source unit
Explanation
Kilogram is the SI base for mass; all conversions pivot through it.
Examples
Example 1: 70 kg
70 kg = 154.32 lb = 11.02 stone.
Applications
- International shipping
- Cooking recipes
- Fitness tracking
Advantages
- All units at once, no re-conversion
Limitations
- Atomic mass units (u/Da) not included — different context
Common mistakes
- Confusing troy ounces (precious metals) with avoirdupois ounces (this calculator)
Tips
- 1 kg ≈ 2.205 lb; multiply kg by ~2.2 for a fast lb estimate
Related concepts
The Weight Converter sits inside the Unit Conversion Tools hub, in the weight, temperature & physics cluster. Mass, thermal and mechanical quantities. Understanding the terms below makes the output easier to interpret and easier to compare against neighbouring measures.
Practical use cases and industry applications
Understanding Weight
Two-way mass conversions across the seven most common metric and imperial units. Within unit conversion tools, weight belongs to the weight, temperature & physics cluster, where it shares terminology and assumptions with closely related tools.
Learning how weight is calculated
Kilogram is the SI base for mass; all conversions pivot through it. Working through the variables one at a time — →kg factor — makes the result reproducible by hand and easier to sanity-check.
Using weight to make a decision
International shipping Cooking recipes Fitness tracking Because outputs depend on the assumptions you enter, run more than one scenario before committing to a figure.
How weight compares with related measures
kilogram, kelvin, pascal, joule all describe adjacent aspects of weight, temperature & physics. Comparing this calculator's output against those measures — using the related tools listed on this page — prevents a single metric from being read in isolation.
Frequently asked questions
Weight vs mass?
Colloquially interchangeable. Physically, mass is what these units measure; weight is mass times gravity.
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