Weight Converter

Convert between weight and mass units — milligrams, grams, kilograms, ounces, pounds, stone, metric tons, US tons. Free, instant.

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Common Weight Conversions

1 lb = 0.454 kg
1 kg = 2.205 lb
1 oz = 28.35 g
1 st = 6.35 kg
1 g = 1000 mg
1 t = 1000 kg
1 US ton = 907.185 kg
1 kg = 35.274 oz

About Weight Converter

Convert between metric and imperial weight units instantly. All calculations happen in your browser — no data is sent to any server.

8 Weight Units

Milligrams, grams, kilograms, ounces, pounds, stone, metric tons, and US tons. All common weight measurements covered.

Metric & Imperial

Seamlessly convert between metric system (mg, g, kg, t) and imperial/US customary (oz, lb, st, US ton).

Real-Time Results

Results update as you type. Change the value, switch units — see the converted weight instantly with no button to press.

Formula Display

Each conversion shows the calculation formula so you can see exactly how the result was derived from your input.

How It Works

1. Enter Value

Type the weight value you want to convert in the input field. You can enter whole numbers, decimals, and scientific notation.

2. Select From Unit

Choose the unit you are converting from — milligram, gram, kilogram, ounce, pound, stone, metric ton, or US ton.

3. Select To Unit

Choose the target unit. The converter instantly calculates the result using kilogram as the base reference unit.

4. Read Result

See the converted value with a formula explanation. Use the common conversions table for quick reference.

📋 Common Use Cases

Quick Conversions

Convert values instantly without memorizing conversion factors or searching for reference tables.

Cross-System Compatibility

Bridge different measurement systems, file formats, or data representations with accurate, reliable conversions.

Professional & Academic Use

Use verified conversion factors for engineering, science, cooking, or international business.

Privacy-Safe Processing

All conversions happen locally in your browser. Your data never leaves your device.

🪜 How to Use This Tool

  1. Enter your value
    Type or paste the value you want to convert. Select the source unit or format from the dropdown.
  2. Choose target format
    Select your desired output unit or format. Common conversions are listed first for quick access.
  3. View the result
    The converted value appears instantly. Conversion formulas and precision details are shown for reference.
  4. Copy or download
    Click to copy the result to clipboard. For file converters, download the converted file directly.

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Frequently Asked Questions

Are these converters free?▼
Yes. All converters are completely free. No signup needed.
How accurate is the unit converter?▼
It uses standard conversion factors for length, mass, temperature, area, volume, and speed. Results are precise to 6 decimal places.