Convert weight instantly between kilograms, pounds, ounces, and grams.
A weight converter lets you switch a weight value between the metric system (kilograms and grams) and the imperial/US customary system (pounds and ounces) instantly, without doing the arithmetic by hand. It is useful when you are reading a recipe from another country, checking airline baggage limits, tracking body weight from a US-made scale, following a workout program written in pounds, or comparing product weights while shopping online.
Kilograms and grams belong to the metric system used almost everywhere in the world for science, trade, and everyday life. Pounds and ounces belong to the imperial system, still used for body weight and cooking mainly in the United States, and for some contexts in the UK. Because the two systems are not simple multiples of ten apart, converting by hand is error-prone — this tool removes that risk.
Every conversion first normalizes the input to kilograms, then converts from kilograms to the target unit, using internationally standardized conversion factors:
1 kilogram = 2.20462 pounds | 1 kilogram = 35.274 ounces | 1 kilogram = 1000 grams | 1 pound = 0.453592 kilograms | 1 ounce = 28.3495 grams
Using kilograms as the base unit (rather than converting directly between every pair of units) keeps the calculation consistent and avoids rounding drift across multiple conversions.
Type the weight value you want to convert into the input box. Select the unit that value is currently in from the dropdown (Kilograms, Pounds, Ounces, or Grams). Click "Convert" and the tool instantly displays the equivalent weight in all four units at once, so you don't need to repeat the process for each unit. Use "Reset" to clear the fields and start a new conversion.
Example 1: 70 kilograms converts to approximately 154.32 pounds, 2,469.16 ounces, and 70,000 grams — a common adult body weight reference point.
Example 2: 1 pound converts to approximately 0.4536 kilograms, 16 ounces, and 453.59 grams — useful for reading US recipe measurements.
Example 3: 500 grams converts to approximately 0.5 kilograms, 1.1023 pounds, and 17.637 ounces — common for grocery items sold by weight.
The United States primarily uses pounds and ounces for body weight and everyday measurement. Most other countries, including the UK for many official purposes, the whole of Europe, and Asia, use the metric system (kilograms and grams).
Yes. The conversion factors used (1 kg = 2.20462 lb, 1 kg = 35.274 oz) are the internationally recognized standard values, not approximations.
Weight ounces (oz) measure mass, as used in this tool. Fluid ounces (fl oz) measure volume and are a completely different unit — they are not interchangeable except for substances like water where density is close to 1.
One stone equals 14 pounds, so divide the pounds value from this tool by 14 to get stones — for example, 154.32 pounds is about 11 stone.
Kilograms are the international scientific standard, so medical dosing, sports science, and lab equipment typically default to kg for consistency across countries.
Yes — the same formulas apply at any scale. For very large weights such as tonnes, note that 1 metric tonne equals 1,000 kilograms.
Different regions and industries favor different weight units for different purposes — kilograms and grams dominate scientific, medical, and most international everyday use, pounds and ounces remain standard in the United States for everything from body weight to cooking ingredients, and units like stones are still commonly used in the UK and Ireland for reporting body weight. Specialized fields have their own conventions too: precious metals like gold are traditionally measured in troy ounces rather than standard ounces, and shipping industries often work in metric tonnes for large cargo weights.
One of the most common weight conversion errors is confusing a standard (avoirdupois) ounce with a troy ounce, since the two represent meaningfully different weights and mixing them up in a context like precious metal pricing can lead to a significant miscalculation. Another frequent mix-up is with a UK "stone" (14 pounds), when precise calculations actually require converting through the full 14-pound conversion factor rather than approximating. Using a dedicated converter removes this kind of ambiguity, ensuring you get an exact figure rather than relying on rough mental approximations.
If you're tracking body weight over time using a scale calibrated in one unit while reading health guidelines expressed in another, consistent, accurate conversion becomes important for meaningfully comparing your progress against recommended ranges. This is especially relevant for international guidelines, medical dosing information, or fitness programs that may use a different weight unit convention than the one your personal scale displays.