Background

Weight conversion is essential in cooking, health, shipping, science, and international trade. The kilogram is the SI base unit; the pound equals exactly 0.45359237 kg.

Weight vs Mass

Mass is the amount of matter (kg); weight is the force of gravity on that mass (N). For everyday conversions, we convert between mass units.

The Stone — A British Unit

The stone (14 lbs or 6.35 kg) is used almost exclusively in the UK and Ireland for body weight.

How to Use This Calculator

1. Select 'Weight' from the dropdown

   Open the Unit Converter and choose Weight.

2. Select your source unit

   Choose kg, g, lbs, oz, stone, or tonnes.

3. Enter the value

   Type the number.

4. Select your target unit

   Choose the unit you need.

5. Use swap to reverse

   Click swap to instantly reverse source and target.

Applications

Cooking and Recipes

Recipes from different countries use different units. 16 oz of flour ≈ 450 g.

Health and Fitness

Track body weight across measurement systems. Convert between kg, lbs, or stone.

Shipping and Logistics

International shipping rates are quoted per kg or per pound. Converting is necessary for cost comparisons.

Frequently Asked Questions