Unit Conversion
Weight Converter – Convert Kilograms, Pounds, Ounces & Grams Instantly
Use our free Weight Converter to instantly convert between kilograms, pounds, grams, and ounces. Accurate and easy-to-use tool for cooking, fitness, and scientific calculations.
Why Use a Weight Converter?
Weight (or mass) is measured differently around the world. Most countries use the metric system (grams, kilograms, metric tons), while the United States and a few others use the imperial system (ounces, pounds, stones). This creates confusion when reading recipes, shipping packages, tracking body weight, or comparing product labels across regions.
Our weight converter supports 9 units across metric, imperial, and specialty systems — including carats (used in gemstones) and grains (used in pharmaceuticals and ammunition). Simply enter a value, pick your units, and get instant results with common conversions shown automatically.
How to Use This Converter
- Enter a weight value and select the source unit
- Select the target unit you want to convert to
- Click Convert to see the result
- Use Swap to reverse the conversion direction
Common Use Cases
- Cooking & recipe scaling
- Body weight tracking
- Shipping & postage
- Nutrition label reading
- Science & lab work
- Jewelry & gemstones
Quick Reference – Common Weight Conversions
| From | To | Multiply by |
|---|---|---|
| 1 Kilogram (kg) | Pounds (lb) | 2.20462 |
| 1 Pound (lb) | Kilograms (kg) | 0.453592 |
| 1 Kilogram (kg) | Ounces (oz) | 35.274 |
| 1 Ounce (oz) | Grams (g) | 28.3495 |
| 1 Stone (st) | Pounds (lb) | 14 |
| 1 Stone (st) | Kilograms (kg) | 6.35029 |
| 1 Metric Ton (t) | Kilograms (kg) | 1,000 |
| 1 Gram (g) | Milligrams (mg) | 1,000 |
| 1 Carat (ct) | Grams (g) | 0.2 |
| 1 Grain (gr) | Grams (g) | 0.0648 |
Understanding Weight Units
Metric System
- Milligram (mg) – Medications and vitamins
- Gram (g) – Cooking and nutrition labels
- Kilogram (kg) – Body weight and groceries
- Metric Ton (t) – Heavy cargo (1,000 kg)
Imperial System
- Ounce (oz) – US cooking and food packaging
- Pound (lb) – US body weight (16 oz = 1 lb)
- Stone (st) – UK body weight (14 lb = 1 st)
Specialty Units
- Carat (ct) – Gemstones (1 ct = 0.2 g)
- Grain (gr) – Pharmaceuticals (1 gr = 64.8 mg)
FAQ – Weight Converter
What is a Weight Converter?
A Weight Converter helps you convert values between different units of mass such as kilograms, grams, pounds, and ounces. It's a handy tool for cooking, science, fitness, and trade measurements.
How many pounds are in a kilogram?
1 kilogram equals approximately 2.20462 pounds. Conversely, 1 pound equals approximately 0.453592 kilograms.
How many grams are in an ounce?
1 ounce equals approximately 28.3495 grams. This is useful for converting cooking recipes between US and metric measurements.
What is a stone and where is it used?
A stone is an imperial unit equal to 14 pounds (approximately 6.35 kg). It is commonly used in the United Kingdom and Ireland for measuring body weight.
What is the difference between weight and mass?
Mass is the amount of matter in an object (measured in kg or lb), while weight is the force of gravity on that mass. On Earth's surface, they are used interchangeably for everyday purposes.
Which units does this converter support?
The converter supports 9 units: milligrams (mg), grams (g), kilograms (kg), metric tons (t), ounces (oz), pounds (lb), stones (st), carats (ct), and grains (gr).
Can I use this for cooking conversions?
Yes! This converter is perfect for converting between grams, ounces, and pounds when following recipes from different countries. For example, converting 200g of flour to ounces for a US recipe.
What is a carat used for?
A carat (ct) is used to measure the weight of gemstones and diamonds. One carat equals exactly 0.2 grams or 200 milligrams. A 1-carat diamond weighs 200 mg.
How do I convert between metric and imperial?
Select any metric unit as the source and any imperial unit as the target (or vice versa). The converter handles cross-system conversions automatically. Use the Swap button to reverse direction.
Is the Weight Converter accurate?
Yes. It uses precise and widely accepted conversion ratios, ensuring accuracy for scientific, educational, or practical purposes. Results are displayed with up to 6 significant digits.