Enter values below to convert pound [lb] to kilogram [kg] , or the other way around.
🏋️ Pound (lb)
What It Is: A pound is a unit of mass used in the imperial and US customary systems. It’s officially defined as 0.45359237 kilograms. There are 16 ounces in a pound.
Where It Comes From: The word "pound" is derived from the Roman libra, meaning a balance or scales. Over time, various definitions emerged until the international avoirdupois pound was formally standardized in 1959. This system includes a prototype weight that was divided into 16 equal parts (ounces).
How It’s Used Today: The pound is widely used in the United States for daily activities such as body weight measurement and food labeling. In the UK, it's still commonly seen on product packaging alongside metric labels. Additionally, pounds are frequently used to express weights of items like luggage or construction materials.
⚖️ Kilogram (kg)
What It Is: A kilogram is the base unit of mass in the International System of Units (SI). Since 2019, it has been redefined based on fixed numerical values of fundamental constants—specifically Planck’s constant. This definition ensures long-term stability and consistency across all measurements globally.
Where It Comes From: The term "kilogram" originated from the French word kilogramme, combining "kilo-" (meaning thousand) with "gram." Originally, it referred to the mass of one liter of water at its freezing point in 1794. However, due to measurement inaccuracies and impracticality, a new definition was adopted in 2019.
How It’s Used Today: As an SI base unit, the kilogram is used across scientific fields, industry, government institutions, and international trade. While some countries like the United States may not use it for everyday purposes, it remains essential in science, engineering, and commerce worldwide.
đź“Ź Pound to Kilogram Conversion Guide
Need to convert pounds to kilograms? Whether you're working on a project, studying for an exam, or just curious, this quick reference table and guide will help you make accurate conversions with ease.
🔢 Conversion Table
| Pounds (lb) | Kilograms (kg) |
|---|---|
| 0.1 lb | 0.0454 kg |
| 0.5 lb | 0.2268 kg |
| 1 lb | 0.4536 kg |
| 2 lb | 0.9072 kg |
| 3 lb | 1.3608 kg |
| 5 lb | 2.2680 kg |
| 10 lb | 4.5360 kg |
| 20 lb | 9.0720 kg |
| 50 lb | 22.6800 kg |
| 100 lb | 45.3600 kg |
| 1000 lb | 453.5924 kg |
Rounded to 4 decimal places for simplicity.
🧮 How to Convert
- From pounds to kilograms: Multiply the weight in pounds by 0.4536
1 lb = 0.4536 kg
- From kilograms to pounds: Multiply the weight in kilograms by 2.2046
1 kg = 2.2046 lbs
✏️ Example Conversion
Convert 15 lbs to kg: 15 lbs Ă— 0.4536 = 6.8040 kg
So, 15 pounds is approximately 6.80 kilograms.
đź’» Behind the Scenes: The Logic That Powers This Converter
// Pound to Kilogram Converter
function convertLBStoKG(lbs) {
return lbs * 0.45359237;
}
// Example usage:
let lbs = 15;
let kg = convertLBStoKG(lbs); // 6.8040