Weight Converter

Weight (and mass) measurement is essential in cooking, medicine, commerce, science, and everyday life. Different countries use different unit systems — the metric system (kilograms and grams) dominates globally, while the imperial system (pounds and ounces) is primarily used in the United States.

The kilogram (kg) is the SI base unit of mass. All metric units derive from it: 1 metric ton = 1,000 kg, 1 gram = 0.001 kg, 1 milligram = 0.000001 kg. In the imperial system, 1 pound = 16 ounces = 0.453592 kg, and 1 stone = 14 pounds = 6.35029 kg.

Common conversions include: body weight (often in lbs vs kg), ingredient weights in recipes (grams vs ounces), shipping weights (pounds vs kilograms), and postal limits. The stone unit is still widely used in the UK and Ireland for body weight. This converter handles all of these with precision.

Note: scientifically, weight and mass are different — weight is the gravitational force on a mass. In everyday usage, they are used interchangeably. This converter treats them as equivalent, which is accurate for Earth's surface at standard gravity.

You may also find our Length Converter, Volume Converter, and BMI Calculator helpful.