⚖️ Free Weight Converter

What is this tool?

The Weight Converter is a free online tool for converting weight and mass between the metric system (kilograms and grams) and the imperial system (pounds and ounces). It is handy for cooking and baking, fitness and nutrition tracking, shipping and postage calculations, and any situation where you need to switch between kg, g, lb, and oz. All conversions happen locally in your browser — nothing is uploaded, so your data stays private.

How it works

The converter uses the standard conversion factors between mass units. The base unit is the kilogram: 1 kg = 1000 g, 1 kg = 2.2046226218 lb, and 1 lb = 16 oz. The tool converts your input to kilograms first, then to your chosen target unit, guaranteeing accurate results for any combination of the four units. Decimals are supported, and the result is shown with up to six significant figures.

How to use

1. Type the weight value you want to convert (for example 3.5 for 3.5 kg).
2. Select the unit of your input from the first dropdown (kg, g, lb, or oz).
3. Select the target unit in the second dropdown and click Convert.
4. The equivalent weight is displayed instantly with the conversion summary.

Frequently Asked Questions

What is the difference between weight and mass?

Mass measures the amount of matter in an object and is the same everywhere; weight is the force of gravity acting on that mass. For everyday conversions on Earth, kg, g, lb, and oz are treated as equivalent measures.

How accurate is this weight converter?

It uses the exact international conversion factors (1 kg = 2.2046226218 lb). Results are correct for cooking, shipping, fitness, and most professional applications.

Can it convert very small or very large weights?

Yes. The tool supports decimals and very large numbers, so it can handle anything from a few grams of spice to multi-ton shipments.

Tips & Advice

In the kitchen, remember that 1 lb ≈ 454 g, so a 1 lb (16 oz) package is about 454 g. For fitness tracking, body weight in kg can be converted to lb by multiplying by 2.2 — this tool does it instantly and exactly.