How to Use This Tool
Enter a Value
Type the weight you want to convert into the input field. Decimals and scientific notation are supported.
Choose Your Units
Pick a From unit and a To unit from the dropdowns. Use the swap button to flip them instantly.
Read the Result
The converted value appears instantly below the inputs. Click Copy to put it on your clipboard.
See All Conversions
Scroll down to see the same value converted into every other supported unit at once, so you can compare them all in one glance.
Frequently Asked Questions
Is this tool really free?
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Yes, completely free with no limits and no sign-up. Everything runs in your browser with no server costs.
Is my data sent to a server?
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No. All conversion math happens directly in your browser. Nothing you type is ever sent anywhere.
What units are supported?
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12 units: Metric Ton, Kilogram, Gram, Milligram, Microgram, Pound, Ounce, Stone, US Ton (short), UK Ton (long), Carat, and Grain.
How accurate are the conversions?
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The tool uses standard conversion factors and displays up to 10 significant figures. Results are accurate for everyday, educational, and professional use.
Can I see all conversions at once?
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Yes. Below the main result, the tool shows the same value converted into every other unit in a scrollable list so you can compare them all at a glance.
Can I swap the From and To units?
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Yes. Click the swap button between the two dropdowns to flip them instantly. The result recalculates right away.
What is the difference between US Ton and UK Ton?
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A US Ton (short ton) is 2,000 pounds (about 907 kg). A UK Ton (long ton) is 2,240 pounds (about 1,016 kg). A Metric Ton is 1,000 kg, which falls between the two.
What is a Stone?
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A stone is 14 pounds (about 6.35 kg). It is commonly used in the UK and Ireland to measure body weight.
What is a Carat?
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A carat is 0.2 grams. It is used to measure the weight of gemstones and diamonds.
What is a Grain?
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A grain is about 0.065 grams. It is one of the oldest units of weight and is still used in ammunition and pharmacy.
What Is Weight Converter?
Weight Converter is a free tool that converts between 12 weight and mass units right in your browser. It covers metric (metric ton down to microgram), imperial (pound, ounce, stone), both US and UK tons, and specialty units like carat and grain. Nothing you type is ever sent anywhere - all math runs locally on your device.
The result updates live as you type, and a full conversion table shows the same value in every other unit at once. Use the swap button to flip your units instantly, or copy the result to your clipboard in one click.
Features Explained
12 Weight Units
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Convert between Metric Ton, Kilogram, Gram, Milligram, Microgram, Pound, Ounce, Stone, US Ton, UK Ton, Carat, and Grain.
Metric Units
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Full metric scale from Metric Ton (1,000 kg) down to Microgram (one millionth of a gram), covering everyday, scientific, and industrial measurements.
Imperial Units
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Pound, Ounce, and Stone for everyday weight measurements in countries that use the imperial system. Stone is commonly used for body weight in the UK.
US and UK Tons
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Both the US short ton (2,000 pounds) and the UK long ton (2,240 pounds) are included alongside the metric ton so you can compare all three.
Specialty Units
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Carat for gemstone weight (0.2 grams) and Grain for ammunition, pharmacy, and historical measurements (about 0.065 grams).
Instant Conversion
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The result updates live as you type. There is no Convert button to click - you see the answer the moment your input changes.
All Conversions at Once
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Below the main result, a scrollable table shows the same value converted into every other unit simultaneously. Great for comparing across scales.
Swap Button
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Click the swap button between the From and To dropdowns to flip them instantly. The result recalculates right away.
Copy to Clipboard
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Click Copy to put the converted value on your clipboard instantly, ready to paste into a document, spreadsheet, or message.
100% Browser-Based
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All conversion math runs directly in your browser. Nothing you type is ever sent to any server - complete privacy.
Who Is This Tool For?
Home Cooks
Convert recipe ingredients between grams, ounces, and pounds when following recipes from different countries.
Fitness Enthusiasts
Convert your body weight between kilograms, pounds, and stones when tracking progress or using equipment marked in different units.
Students
Convert between metric and imperial weight units for physics, chemistry, and science homework.
Teachers
Show weight conversions in real time during lessons and help students understand different measurement systems.
Pharmacists
Convert between grams, milligrams, and grains when working with medication dosages and compounding formulas.
Jewelers
Convert between carats, grams, and ounces when weighing gemstones, gold, and precious metals.
Shipping and Logistics
Convert package weights between kilograms and pounds for international shipping labels and freight calculations.
Travelers
Convert between kilograms and pounds to understand luggage weight limits when flying internationally.
Engineers
Convert between metric and imperial mass units when working with international specifications and standards.
Farmers and Agriculture
Convert harvest weights and feed amounts between metric tons, pounds, and kilograms for trade and record-keeping.
Nutritionists and Dietitians
Convert food portions and body weight between metric and imperial units when working with international clients.
Online Shoppers
Convert product weights between grams and ounces when buying from international sellers to understand what you are getting.
Veterinarians
Convert animal weights between kilograms and pounds for medication dosing and health records.
Bakers
Convert flour, sugar, and ingredient weights between grams, ounces, and pounds for precise baking measurements.
Weightlifters
Convert barbell and plate weights between kilograms and pounds when switching between metric and imperial gym equipment.
Scientists
Convert between grams, milligrams, and micrograms for laboratory measurements and research data.
Importers and Exporters
Convert bulk cargo weights between metric tons, US tons, and UK tons for international trade documents.
Fishermen
Convert catch weights between kilograms and pounds for records, regulations, and tournament entries.
Parents
Convert your baby's weight between kilograms and pounds for health checkups and growth tracking.
Hunters
Convert ammunition measurements in grains to grams or milligrams when comparing loads and specifications.
Crafters and Makers
Convert material weights between grams and ounces when following patterns or ordering supplies internationally.
Real Estate
Convert construction material weights when estimating loads for building projects across different measurement systems.
Healthcare Professionals
Convert patient weights between kilograms, pounds, and stones for medical records and drug dosage calculations.
Anyone
Quickly convert any weight for any reason - cooking, shopping, travel, curiosity, or work.
Tips for Best Results
Use the All Conversions table
Scroll below the main result to see the same value in every other unit at once. This is the fastest way to compare across scales.
Use the swap button
Click the swap button between the dropdowns to flip From and To instantly instead of changing both dropdowns manually.
Know your common conversions
1 kg = 2.205 lb, 1 lb = 16 oz, 1 stone = 14 lb, 1 oz = 28.35 g. The tool handles these and many more automatically.
Watch out for the three tons
A Metric Ton is 1,000 kg. A US Ton (short) is 2,000 lb (907 kg). A UK Ton (long) is 2,240 lb (1,016 kg). Make sure you pick the right one for your region.
Carats are for gemstones
One carat is 0.2 grams. This is the unit used for diamonds and gemstones, not to be confused with karat (which measures gold purity).
Grains are tiny
One grain is about 0.065 grams. It is used in ammunition, pharmacy, and some historical contexts. The tool handles it alongside everyday units.
Copy the result in one click
Click Copy next to the result to put the value on your clipboard, ready to paste into a spreadsheet, document, or message.
Decimals are fully supported
You can type values like 0.5, 3.14, or 12.75. The tool handles decimal precision up to 10 significant figures.
Scientific notation works too
For very large or very small values, type scientific notation like 1.5e6 (1,500,000) or 2.5e-9 instead of counting zeros.
Privacy is built in
Nothing you type is ever sent to any server. All math runs in your browser, so your measurements stay completely private.
Privacy & Security
This tool runs 100% in your browser. Your files stay entirely on your own device. Nothing is uploaded, nothing is shared, and no server, advertiser, or third party has access to your files.
If a tool saves your work on your own device, you can remove it at any time using the Clear All button. Some tools rely on an external service to return their result; in those cases, only the minimum data required for the request is sent, and never your files or content. Any ads shown on this page run in an isolated frame and cannot read, touch, or transmit anything you upload, paste, type, or download here. Advertisers may see standard visit information like your IP address and which page you're on, as described in our Privacy Policy, but your data itself stays fully under your control.
