Weight Converter
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Weight & Mass Unit Converter
This weight unit converter lets you instantly switch between kilograms, grams, milligrams, tonnes, pounds, ounces, and stone — all in one place, with no formulas to memorize. Whether you are adapting a recipe, calculating shipping costs, or checking medical references, accurate weight conversion is just a number and a click away. Enter a value, pick your source unit, and every equivalent appears immediately.
Benefits
Using a dedicated weight converter beats mental arithmetic or searching for conversion factors every time:
- Multi-system coverage: Handles both metric units (kg, gram, mg, tonne) and imperial/US customary units (pound, ounce, stone) simultaneously.
- High precision: Results are computed to several decimal places, eliminating rounding errors that creep in with manual calculations.
- Instant results: No page reloads, no app installs — works in any browser on desktop or mobile.
- Completely free: No account, no subscription, no limits on how many conversions you run.
Use cases
The weight unit converter proves useful across a surprising range of everyday situations:
- Cooking and baking: Scale recipes from US cookbooks that use ounces and pounds into grams and kilograms used on kitchen scales outside the US.
- International shipping: Verify package weights in the destination country's preferred unit to calculate accurate freight or postage costs.
- Health and fitness: Convert body weight between kg and pounds when reading English-language BMI charts, fitness apps, or medical reports.
- Science and engineering: Students and professionals can quickly move between SI and non-SI units when solving physics problems or writing technical documents.
- Gym and weightlifting: Many barbells and plates are labeled in pounds; convert to kg to match gym equipment calibrated in metric.
How to use
Converting weights takes three steps:
- Step 1: Type a numeric value into the input field (decimals like 2.75 are supported).
- Step 2: Select the source unit from the dropdown — kg, gram, mg, tonne, pound, ounce, or stone.
- Step 3: Converted values for all other units appear instantly below.
You can also click any result field to use that unit as the new starting point for a fresh conversion.
Frequently asked questions
How many kg is one pound? One pound equals exactly 0.45359237 kg, commonly rounded to 0.454 kg for everyday use.
What is a stone and where is it used? A stone (st) equals 14 pounds (approximately 6.35 kg) and is traditionally used in the United Kingdom and Ireland to express a person's body weight.
Is a tonne the same as a ton? Not exactly — a metric tonne is 1,000 kg, while a US short ton is about 907 kg and a UK long ton is about 1,016 kg. This converter uses the metric tonne.
Can I convert very small weights like milligrams? Yes. The converter handles the full range from milligrams (mg) up to tonnes, making it equally useful for laboratory measurements and bulk freight calculations.