Weight Converter

Convert between kilograms, pounds, ounces, grams, tons, and other weight units instantly. Accurately convert mass for cooking, shipping, and fitness. Free online weight converter.

How to Use

  1. Enter the weight value

    Type the weight value you want to convert.

  2. Select the units

    Choose the source unit (e.g., pounds) and the target unit (e.g., kilograms).

  3. View the result

    Click Convert to see the converted weight value.

What is weight unit conversion?

Weight (mass) unit conversion means expressing the same amount of weight in different units of measure. Because countries and industries use different units, Korea and Europe mainly rely on kilograms (kg) and grams (g), while the US and UK mainly use pounds (lb) and ounces (oz).

This converter uses the kilogram, the SI base unit for mass, as its pivot: every value is first turned into kg and then converted back into the target unit. That way any combination from milligrams to tons is calculated with consistent precision.

  • Cooking and baking: convert oz and lb in foreign recipes into grams
  • Logistics and shipping: convert cargo weight into kg and tons
  • Traditional trade: convert the geun (斤) used when buying meat or fruit

Calculation Formula

Every unit is unified through the base unit, the kilogram (kg).

result = value × (source factor) / (target factor)

Here a factor is 'the value of 1 of that unit expressed in kg'. e.g. lb = 0.453592, oz = 0.0283495, g = 0.001, geun = 0.6.

Example: 5 pounds to grams

  • source factor (lb) = 0.453592, target factor (g) = 0.001
  • result = 5 × 0.453592 / 0.001 = 2,267.96 g

Frequently Asked Questions

How many kilograms is one pound?
One pound (lb) equals exactly 0.453592 kilograms (kg). Conversely, 1 kg is about 2.2046 pounds. The pound is mainly used in the US and UK for body weight and grocery weights.
How many grams is one ounce?
One avoirdupois ounce (oz) is about 28.3495 grams (g). The troy ounce used for precious metals such as gold and silver is heavier, at about 31.1035 g, so be careful not to confuse them. This converter is based on the avoirdupois ounce.
How many grams is the Korean geun (斤)?
One geun (斤) as used in Korea is 600 grams (0.6 kg). It is commonly used when trading meat or fruit. Note that the Chinese geun is 500 g, so the same character means a different weight; confirm before any overseas transaction.
What types of tons are there?
A metric ton is 1,000 kg, a US short ton is about 907.185 kg, and a British long ton is about 1,016.047 kg. This calculator converts based on the metric ton (1,000 kg), the most widely used internationally.
How many pounds is one kg?
One kg is about 2.204623 pounds (lb). This is the value of 1 ÷ 0.453592, and for a quick estimate it helps to remember 'multiply kg by 2.2 to get pounds'.
Are weight and mass the same thing?
Strictly speaking, mass (in kg) is the amount of matter an object contains, while weight is the magnitude of the gravitational force acting on that matter. In everyday life and trade, though, the terms are used interchangeably, and this converter handles mass units such as kg, g, and lb.
How many decimal places does the result show?
Results are rounded and displayed to six decimal places. For example, converting 1 kg to lb gives a precise value like 2.204623, providing enough accuracy for cooking and precision weighing.
Which units can I convert?
You can freely convert in both directions between milligrams (mg), grams (g), kilograms (kg), tons, pounds (lb), ounces (oz), and the Korean geun (斤). Since every unit is converted via kg, any combination is accurate.
2026 international standards

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