Weight Converter
Convert between kilograms, pounds, ounces, stone and more — instantly, as you type.
Conversions use fixed standard metric/imperial factors. For legal, medical or shipping documents that require an exact certified weight, confirm against the relevant standard or measuring instrument.
How it works
Enter a value
Type the weight you want to convert.
Pick your two units
Choose "From" and "To," or hit swap to flip them instantly.
Read the result
The converted weight updates live, rounded to 2 decimals or full precision — your choice.
What people use a weight converter for
Weight units mix constantly depending on where a recipe, a spec sheet or a scale comes from.
Recipes
Fitness tracking
Shipping & freight
School science projects
Product specs
A few things worth knowing about weight conversion
A weight converter solves a small but constant annoyance: the number on a package, a recipe or a scale isn't always in the unit you're used to thinking in. Rather than doing the multiplication by hand and risking a slipped decimal, typing the value once and reading the equivalent in whatever unit you need is faster and harder to get wrong.
How much precision you actually need depends on the situation. For everyday things — following a recipe, telling a friend how much luggage you're checking, getting a rough sense of a product's weight — rounding to two decimals is plenty and easier to read at a glance. For anything more exact, like a shipping label with a strict weight limit, a lab measurement, or manufacturing specs, it's worth switching rounding off and using the full-precision figure instead, since small differences can matter there in a way they don't for a dinner recipe.
Metric and imperial units keep coexisting because different countries and industries standardized on different systems and never fully switched. Most of the world uses kilograms and grams day to day, while the US still runs on pounds and ounces, and stone shows up specifically for body weight in the UK and Ireland. One mix-up worth watching for in the kitchen: an "ounce" of weight and a "fluid ounce" of volume are not the same thing and don't convert the same way for most ingredients, so double-check which kind of ounce a recipe actually means before assuming this converter's Ounces unit applies.
Frequently asked questions
How do I convert kg to lbs?
Pick Kilograms as the "From" unit and Pounds as the "To" unit, then type your value. One kilogram equals about 2.20462 pounds, and the calculator applies that automatically as you type.
What's the difference between metric and imperial weight units?
Metric units (grams, kilograms, metric tons) scale by powers of ten and are the standard nearly everywhere outside the United States. Imperial/US units (ounces, pounds, stone) come from an older system still used day-to-day in the US and, for stone specifically, in the UK and Ireland — which is why both systems keep showing up depending on the country or industry.
Should I round the result?
For a quick, practical read (cooking, casual conversation, a rough estimate) rounding to 2 decimals is usually enough. For anything that needs to be exact — a shipping label, a scientific measurement, manufacturing specs — turn rounding off and use the full-precision figure.
Are ounces for weight the same as fluid ounces?
No, and mixing them up is one of the most common recipe mistakes. This converter's "Ounces" is a unit of weight (mass). Fluid ounces measure volume instead, and the two only convert to each other consistently for water — for most other ingredients, a weight ounce and a fluid ounce are not interchangeable.
Is this weight converter free to use?
Yes, completely free, with no account or sign-up, and it runs entirely in your browser.