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Weight Converter

Convert weight and mass between kilograms, pounds, grams, ounces, and stones. Free, client-side unit converter with instant calculations.

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How to use Weight Converter

  1. 1

    Enter your weight or mass value.

  2. 2

    Choose your input unit (kilograms, pounds, grams, ounces, stones).

  3. 3

    Choose your target unit and click Convert.

Capabilities

  • Converts between kilograms, pounds, grams, ounces, milligrams, and stones
  • Standard avoirdupois pound conversion (0.45359237 kg)
  • Instant calculations for fitness, cooking, and postal weighing

How Weight & Mass Conversions Work

Weight and mass conversions translate between the metric kilogram (the SI fundamental unit of mass) and imperial avoirdupois units (pounds, ounces, stones). Under international standards, the avoirdupois pound is legally pegged to exactly 0.45359237 kilograms, providing an exact mathematical bridge between global medical, fitness, and trade measurements.

Conversion Factors (Base: Kilogram)

1 Gram: 0.001 kg
1 Pound: 0.45359237 kg
1 Ounce: 0.02834952 kg

Worked Example: Converting 150 Pounds to Kilograms

Input: 150 lbs

Multiplication: 150 * 0.45359237 = 68.0389 kg

Classification: 150 pounds corresponds to approximately 68.04 kg.

Calculating Body Mass Index?

Use your converted weight and height to evaluate WHO BMI categories.

BMI Calculator
Privacy & Processing

This tool operates in a sandbox directly inside your web browser. All parsing, processing, and downloads are rendered locally. Your file size, metadata, and contents never cross the network. It works completely offline.

Frequently Asked Questions

How many pounds are in one kilogram?

One kilogram equals approximately 2.20462 pounds (avoirdupois). Conversely, 1 pound equals exactly 0.45359237 kilograms.

How do you convert grams to ounces?

Divide the weight in grams by 28.3495, or multiply by 0.035274. For example, 100 grams is approximately 3.53 ounces.

What is a stone in weight measurement?

A stone is an imperial unit of mass used predominantly in the United Kingdom and Ireland, defined as exactly 14 pounds (approximately 6.35029 kilograms).

What mass units are supported?

The tool supports kilograms, grams, milligrams, pounds (lbs), ounces (oz), and stones.

Is this weight converter free to use?

Yes. It runs client-side in your web browser with no registration or fee.

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