Weight converter
Pick two weight units and type a number to see the answer with its formula. Everything rests on one exact definition: 1 pound = 0.45359237 kg, and 16 ounces make a pound.
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The answer updates as you type.
1 kilogram =
2.20462lb
Also written as 2 lb 3.27 oz
Formula: lb = kg ÷ 0.45359237
Show the steps
- Definition: SI base unit of mass; 1 lb = 0.45359237 kg exactly
- 1 kg ÷ 0.45359237 = 2.20462 lb
Definitions used: SI base unit of mass; 1 lb = 0.45359237 kg exactly.
Source: NIST SP 811, Appendix B.8 and NIST Handbook 44 (2026), Appendix C, checked on .
1 kilogram in every weight unit
| Unit | Value |
|---|---|
| Milligrams (mg) | 1,000,000 |
| Grams (g) | 1,000 |
| Metric tons (t) | 0.001 |
| Ounces (oz) | 35.274 |
| Pounds (lb) | 2.20462 |
| Stone (st) | 0.157473 |
| Short tons (ton) | 0.00110231 |
The table follows the amount and the “From” unit you set in the converter above.
How each weight unit is defined
These are the definitions the converter uses, as written in the source next to each one. Nothing is rounded before the calculation.
| Unit | Definition | In kilograms |
|---|---|---|
| Milligram (mg) | 1 mg = 0.001 g (SI prefix milli) | 0.000001 |
| Gram (g) | 1 g = 0.001 kg | 0.001 |
| Kilogram (kg) | SI base unit of mass | 1 |
| Metric ton (t) | 1 t = 1000 kg | 1,000 |
| Ounce (oz) | 1 oz = 28.349523125 g exactly (1/16 lb) | 0.02834952313 |
| Pound (lb) | 1 lb = 0.45359237 kg exactly | 0.45359237 |
| Stone (st) | 1 stone = 14 lb | 6.35029318 |
| Short ton (ton) | 1 short ton = 2000 lb = 907.18474 kg | 907.18474 |
Weight conversion questions
How many pounds are in a stone?
A stone is 14 pounds, or 6.35029318 kg. It is used for body weight in the UK and Ireland.
What is the difference between a ton and a tonne?
A metric ton (tonne) is 1,000 kg. A US short ton is 2,000 lb, or 907.18474 kg, so the tonne is about 10% heavier.
Is weight the same as mass?
In physics, no: mass is the amount of matter and weight is a force. Kilograms, pounds and ounces are units of mass, and everyday “weight” on a scale is reported in them.
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Sources and limits
- NIST SP 811, Appendix B.8
NIST Special Publication 811, Guide for the Use of the SI, Appendix B.8: Factors for Units Listed Alphabetically (page updated August 18, 2025).
National Institute of Standards and Technology. Edition or effective date: . Text in force when checked on .
- NIST Handbook 44 (2026), Appendix C
NIST Handbook 44-2026, Appendix C: General Tables of Units of Measurement.
National Institute of Standards and Technology. Edition or effective date: . Text in force when checked on .
This is a calculation aid, not an official measurement service. Results are rounded to 6 significant digits for display. For trade, engineering, medical dosing or legal documents, confirm the figure in the official source. Nothing you type leaves your browser.