Weight Converter
Convert between metric and imperial weight units instantly.
⚖️ Supports metric (mg, g, kg, t) and imperial (oz, lb, st) weight units.
Metric vs. Imperial Weight Units
Weight (or more precisely, mass) is measured in two main systems worldwide. The metric system (milligrams, grams, kilograms, metric tons) is used in nearly every country and is based on powers of 10. The imperial system (ounces, pounds, stones) is used primarily in the United States and, for body weight, in the UK and Ireland.
Key Conversion Factors
- 1 kilogram = 2.20462 pounds
- 1 pound = 0.453592 kilograms = 16 ounces
- 1 ounce = 28.3495 grams
- 1 stone = 14 pounds = 6.35029 kilograms
- 1 metric ton = 1000 kilograms = 2204.62 pounds
Common Uses
- Body weight: kg in most countries, lb or st in the US/UK
- Cooking: grams in recipes worldwide, ounces/pounds in US recipes
- Shipping and freight: kg globally, lb domestically in the US
- Precious metals: troy ounces (different from regular ounces)
- Babies: grams at birth in metric countries, pounds/ounces in the US
Quick Mental Conversions
- kg to lb: multiply by 2.2 (or double and add 10%)
- lb to kg: divide by 2.2 (or halve and subtract 10%)
- oz to g: multiply by 28
- 80 kg ≈ 176 lb, 150 lb ≈ 68 kg
The Difference Between Mass and Weight
Technically, mass (kilograms) measures how much matter something contains, while weight (newtons, or pounds-force) measures the gravitational force on that mass. Your mass is the same on Earth and the Moon; your weight is about 1/6 on the Moon. In everyday use, we treat them as interchangeable, and this converter does the same.
About the Weight Converter
The Weight Converter converts weight converterfrom one unit to another using the exact internationally defined conversion factors. Type a value, choose your source and target units, and the converted result is shown instantly — no waiting, no page reload.
Manual conversion is error-prone because it means memorizing ratios (how many feet in a meter, how many pints in a liter). This tool removes that friction: the conversion factor is built in, and the math is done to full precision with no rounding until the final displayed number.
How to Use This Tool
- Enter the value you want to convert in the input field.
- Select the unit you are converting from.
- Select the unit you want to convert to.
- The converted value appears instantly. Adjust either unit to compare across the board.
- Copy the result if you need it elsewhere. Your input is never sent anywhere.
Why Use an Online Converter?
Browser-based tools like this one have a few real advantages over installed software or manual methods:
- No installation. It opens instantly in any browser, on any operating system.
- Private by default. Everything runs locally, so your data stays on your device.
- Always up to date.There's nothing to update — you always get the latest version when you load the page.
- Free and unlimited. Use it as often as you like, with no account and no caps.
Related Tools
More tools you might find useful
Pressure Converter
Convert between bar, PSI, pascal, atm and more.
Area Converter
Convert between metric and imperial area units, including acres and hectares.
Number Base Converter
Convert between binary, octal, decimal, and hex.
QR Code Generator
Create custom QR codes for URLs, text, and WiFi. Free, no watermark.
Text to List Converter
Add bullet points to each line of text.
Combination Calculator
Calculate combinations (n choose r) for probability and odds.