Weight / Mass Converter
Convert between kilograms, pounds, ounces, stones, and more.
What is Weight?
A mass/weight converter covering metric (kg, g, mg, t), imperial (lb, oz, st), and US customary (short ton) units.
How it works
Every unit is defined relative to the kilogram, and conversion is a ratio multiply.
- Enter your input. Type or paste your input into the field above — the tool responds instantly.
- Review the result. Output updates live as you type. Everything runs entirely in your browser.
- Copy or download. Use the Copy button to grab the result, or Download to save it as a file.
Examples
Grocery and shipping weights
Convert 2.5 kilograms to 5.51 pounds — or ounces, stones, and tons — for recipes, parcels, and fitness tracking.
Common mistakes
Mass vs weight
Kilograms measure mass; pounds are used for both. For everyday purposes the converter treats them as equivalent, which is standard practice.
Frequently asked questions
Which units are supported?
Milligrams, grams, kilograms, tonnes, ounces, pounds, stones, and US tons.
What about body weight tracking?
Convert kg to lbs (or back) with two decimal places — enough for consistent daily tracking.
Is a stone really 14 pounds?
Yes — the stone is defined as exactly 14 lb and is still common in the UK and Ireland for body weight.