Weight Converter
Convert between kilograms, pounds, ounces, grams, and more.
What is a Weight Converter?
A Weight (Mass) Converter translates measurements of how heavy something is between metric and imperial systems. Weight and mass are often used interchangeably in daily life, though scientifically they differ: mass is the amount of matter (constant everywhere), weight is the gravitational force (changes on different planets). For Earth-based purposes, the terms are synonymous.
The Metric system uses Kilograms (kg)as the base unit. 1 kg = 1000 grams (g). It's a decimal system, making calculations easy. The Imperial/US system uses Pounds (lb) and Ounces (oz). 1 lb = 16 oz. This system is non-decimal, which complicates math but is deeply ingrained in US culture (bodyweight, food portions, shipping).
Our converter supports 8 different units, from the microscopic (milligrams for medication dosages) to the massive (Metric Tons for cargo ships). It includes specialty units like Stones (common in the UK for bodyweight: 1 stone = 14 lbs) and Carats (used for gemstones: 1 carat = 0.2 grams).
The tool uses Grams as the universal 'base unit' internally. Any input is first converted to grams, then to the target unit. This ensures accuracy across any combination of units.
1How to Use
- Input Weight: Type the numeric value (e.g., 5 if you have 5 kilograms).
- Select Source Unit: Choose the unit your input is measured in (e.g., Kilograms).
- Select Target Unit: Pick the unit you want to convert to (e.g., Pounds).
- Read Result: The converted weight displays instantly.
- Quick Reference: Check the comparison cards below to see how your input unit relates to other common units.
- Copy: Click the copy icon to paste the result elsewhere.
★Key Features
- 8 Unit Support: Kilograms, Grams, Milligrams, Ounces, Pounds, Stones, Metric Tons, and Carats.
- Dual System Coverage: Full metric and imperial/US unit support.
- Live Conversion: Updates instantly as you type—no 'calculate' button needed.
- Precision Control: Shows up to 6 decimal places for scientific accuracy.
- Quick Comparisons: See at-a-glance equivalents for your selected unit.