Weight Converter — Free Online Weight & Mass Unit Converter
Our free weight converter instantly converts between all major weight and mass units. Use the weight converter to switch between kilograms, pounds, grams, ounces, stone and more — no sign-up required. This weight converter uses verified conversion factors based on international SI standards. Learn more at Wikipedia's mass unit reference and the NIST unit conversion guide.
⚖️ Weight Converter
Popular Weight Conversions
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Quick Reference Tables
Common weight values converted at a glance.
Kilograms → Pounds
| Kilogram (kg) | Pound (lb) |
|---|---|
| 0.5 kg | 1.102311 lb |
| 1 kg | 2.204623 lb |
| 2 kg | 4.409245 lb |
| 3 kg | 6.613868 lb |
| 5 kg | 11.023113 lb |
| 10 kg | 22.046226 lb |
| 15 kg | 33.069339 lb |
| 20 kg | 44.092452 lb |
| 25 kg | 55.115566 lb |
| 50 kg | 110.231131 lb |
Grams → Ounces
| Gram (g) | Ounce (oz) |
|---|---|
| 0.5 g | 0.01763698 oz |
| 1 g | 0.03527396 oz |
| 2 g | 0.07054792 oz |
| 3 g | 0.10582189 oz |
| 5 g | 0.17636981 oz |
| 10 g | 0.35273962 oz |
| 15 g | 0.52910943 oz |
| 20 g | 0.70547924 oz |
| 25 g | 0.88184905 oz |
| 50 g | 1.763698 oz |
Pounds → Kilograms
| Pound (lb) | Kilogram (kg) |
|---|---|
| 0.5 lb | 0.22679619 kg |
| 1 lb | 0.45359237 kg |
| 2 lb | 0.90718474 kg |
| 3 lb | 1.360777 kg |
| 5 lb | 2.267962 kg |
| 10 lb | 4.535924 kg |
| 15 lb | 6.803886 kg |
| 20 lb | 9.071847 kg |
| 25 lb | 11.339809 kg |
| 50 lb | 22.679619 kg |
Conversion Formulas
The exact math behind every weight unit conversion.
Understanding Weight & Mass Units
Kilograms vs Pounds — The Global Split
Kilograms (kg) are the SI base unit of mass, used in virtually every country for body weight, food, and scientific measurement. One kilogram equals 1,000 grams and is defined by the International Bureau of Weights and Measures via the Planck constant — making it one of the most precisely defined units in science.
Pounds (lb) are the primary weight unit in the United States and a few other countries. One pound equals exactly 0.45359237 kilograms by international agreement. The kg to lbs conversion is one of the most searched unit conversions globally, used daily in fitness, medicine, and international shipping.
Grams & Ounces — Cooking & Commerce
Grams (g) are the workhorse of metric weight — used everywhere from kitchen scales to pharmaceutical dosing. One gram is one-thousandth of a kilogram. Grams are standard in food nutrition labels, chemistry, and jewellery across most of the world.
Ounces (oz) — specifically avoirdupois ounces — are used in the US and UK for food packaging, recipes, and everyday retail products. One ounce equals approximately 28.3495 grams. The grams to ounces conversion is essential for anyone following recipes that mix metric and imperial measurements.
Stone — The British Body Weight Unit
A stone (st) is a unit of body weight used predominantly in the United Kingdom and Ireland. One stone equals exactly 14 pounds or approximately 6.35 kilograms. It is almost exclusively used for expressing human body weight — you'll rarely see it applied to food or cargo.
Despite metrication efforts, the stone remains deeply embedded in British culture. Doctors, gyms, and bathroom scales in the UK routinely display weight in stone and pounds. The stone to lbs and lbs to stone converters are particularly useful for anyone moving between the UK and US.
How Weight Conversions Work
Weight (or more precisely, mass) conversions are straightforward multiplications — there are no offsets or complex formulas. Every unit has a fixed ratio to the SI base unit (the kilogram), so converting from any unit to any other requires a single multiplication by an internationally defined factor.
For example: 1 kilogram = 2.20462 pounds, so to convert kg to lbs you multiply by 2.20462. Our converter applies these exact internationally agreed factors instantly for all unit pairs — whether you're tracking your fitness progress, calculating postage, or scaling a recipe from metric to imperial.
Frequently Asked Questions
Frequently Asked Questions
1 Kilogram (kg) equals 2.204623 Pounds (lb).
Multiply the value in Kilograms by 2.204623. For example, 10 Kilograms = 22.046226 Pounds.
Yes. ConvertNow uses precise factors for all unit calculations. Currency conversions use live exchange rates updated regularly.
Yes — type into the right-hand field to reverse the conversion.