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Free Weight Converter – Convert kg, lbs, and More

Convert between kilograms, pounds, ounces, stones, tonnes and more.

Weight and Mass Converter What is this? ↓
About the Weight and Mass Converter

What is the Weight and Mass Converter?

A weight and mass converter changes a mass value between metric and imperial units, including grams, kilograms, tonnes, ounces, pounds and stones.

Why use this calculator?

Strictly, weight is a force and mass is an amount of matter, but in everyday use the two are treated as the same, and all units here are masses.

How to use it

  1. Enter the mass value.
  2. Choose the source and target units.
  3. Read the converted value.

Formula

Every unit is defined relative to the kilogram, the SI base unit of mass.
The pound is legally defined as exactly 0.45359237 kilograms.
Frequently Asked Questions
How many kilograms are in a pound?
One pound equals about 0.4536 kilograms, or roughly 0.45 kg.
What is the difference between a short ton and a long ton?
A US (short) ton is 2,000 pounds; a UK (long) ton is 2,240 pounds. A metric tonne is 1,000 kilograms.
How precise are the conversions?
Conversions use standard, internationally defined factors and are rounded for display. They are accurate to the number of digits shown.
Can I convert back and forth without losing accuracy?
Yes. Enter the original value to get an exact inverse conversion; avoid chaining rounded results if you need maximum precision.
Which measurement system is used?
Both metric (SI) and US customary / imperial units are supported and clearly labelled.
Is this calculator free to use?
Yes. Every calculator on this site is completely free, with no hidden fees, no subscriptions and no limits on how many times you can use it.
How accurate are the results?
We use standard, widely accepted formulas and calculate in your browser using double-precision arithmetic. Results are rounded for readability, so treat them as reliable estimates rather than a guarantee. Real-world factors can vary the true figure.
Can I add this calculator to my own website?
Yes. Open this calculator page and use the "Add to your website" box in the sidebar to copy a ready-made iframe snippet, then paste it into any HTML page.
Does it work on a phone or tablet?
Yes. The layout is fully responsive, so it works on desktops, laptops, tablets and mobile phones, and every input adapts to touch screens.
Is the information I type kept private?
Yes. All calculations run locally in your browser. Nothing you enter is uploaded, stored or shared with anyone.

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