Weight Converter — Kilograms, Pounds, Ounces, Stone & More
Convert between kilograms, pounds, ounces, stone, metric tonnes, and US tons. Free online weight converter for fitness, cooking, shipping, and science.
Weight Converter
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The Formula
Weight (mass) conversion uses linear scaling factors relative to the gram. Each unit has a fixed conversion factor to grams. To convert from unit A to unit B, multiply the input value by the ratio of the two factors.
Variable Definitions
Gram
The metric base unit of mass. One gram is defined as 1/1000 of a kilogram. The mass of one cubic centimeter of water at 4°C.
Kilogram
The SI base unit of mass. Originally defined as the mass of one liter of water, now defined by the Planck constant. The standard for everyday weight worldwide outside the US.
Pound & Ounce
Pound (453.59237 g): the primary weight unit in the US, UK, and some Commonwealth countries. Ounce (28.3495 g): 1/16 of a pound, used for food, mail, and precious metals.
Tonne & US Ton
Metric tonne (1,000 kg): used worldwide for industrial and commercial weight. US ton (2,000 lb ≈ 907 kg): used in the US for heavy goods, vehicles, and freight.
How to Use This Calculator
- 1
Enter the weight value you want to convert.
- 2
Select the current weight unit from the "From" dropdown.
- 3
Select the desired weight unit from the "To" dropdown.
- 4
The converted value is displayed instantly with the formula. Use this for cooking, shipping, fitness, or science calculations.
Quick Reference
| From | To |
|---|---|
| 1 kg | 2.205 lb / 35.274 oz |
| 1 lb | 0.454 kg / 16 oz / 453.592 g |
| 1 oz | 28.35 g / 0.0625 lb |
| 1 st | 14 lb / 6.35 kg |
| 1 t | 1,000 kg / 2,204.6 lb / 1.102 US tons |
| 1 US ton | 2,000 lb / 907.185 kg / 0.907 t |
| 1 g | 0.035 oz / 1,000 mg |
Common Applications
- Fitness: converting body weight between kg and lb for workout programs and health tracking
- Cooking: scaling recipes that use grams, ounces, or pounds for accurate ingredient measurements
- Shipping and freight: calculating charges based on weight in kg, lb, or tonnes for air, sea, and ground transport
- Science: measuring chemicals and samples in milligrams, grams, or kilograms for experiments
- International trade: converting product specifications and shipping weights between metric and imperial systems
- Precious metals: weighing gold and silver in troy ounces (31.1035 g) for pricing and trading
Metric and imperial weight units compared. The kilogram is the SI standard; the pound is the US/UK customary unit.
Understanding the Concept
Weight measurement (more precisely, mass measurement) is fundamental to commerce, science, and daily life. The kilogram is the SI base unit of mass and the only SI base unit still defined by a physical constant (the Planck constant) after the 2019 redefinition. Before 2019, the kilogram was defined by the International Prototype of the Kilogram (IPK), a platinum-iridium cylinder kept in a vault near Paris. The gram is 1/1000 of a kilogram and is the everyday unit for cooking and small quantities. The pound has ancient origins, dating back to Roman times (libra pondo), which gives lb its symbol. The international avoirdupois pound was standardized as exactly 0.45359237 kg in 1959. The ounce (1/16 lb) is used for food portions, letters, and precious metals. The stone (14 lb) remains common in the UK and Ireland for expressing body weight — someone weighing 70 kg is about 11 stone. Metric tonnes (1,000 kg) are used for industrial quantities; US tons (2,000 lb) for heavy goods in the US. Understanding weight conversions is crucial for international shipping, fitness tracking, and cooking across cultures.
Frequently Asked Questions
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