Weight Converter
Convert between kilograms, grams, pounds, ounces, tons and more units instantly.
What is a Weight Converter?
A weight converter is a tool that helps you convert measurements of mass or weight from one unit to another. While technically "mass" and "weight" have different meanings in physics, they are often used interchangeably in everyday language.
Weight conversion is essential for cooking, fitness tracking, shipping, science experiments, and international trade. Different countries use different systems - the metric system (kilograms, grams) is standard worldwide for scientific use, while the imperial system (pounds, ounces) is common in the United States and UK.
Our converter supports all major weight units and provides instant, accurate conversions whether you're measuring ingredients for a recipe or calculating shipping costs.
Weight Conversion Formulas
Metric to Imperial
- Kilograms to Pounds: lb = kg × 2.20462
- Grams to Ounces: oz = g × 0.035274
- Kilograms to Stone: st = kg × 0.157473
- Metric Tons to US Tons: US ton = t × 1.10231
Imperial to Metric
- Pounds to Kilograms: kg = lb × 0.453592
- Ounces to Grams: g = oz × 28.3495
- Stone to Kilograms: kg = st × 6.35029
- US Tons to Metric Tons: t = US ton × 0.907185
Quick Reference Table
| From | To | Multiply by |
|---|---|---|
| 1 kilogram | grams | 1,000 |
| 1 gram | milligrams | 1,000 |
| 1 metric ton | kilograms | 1,000 |
| 1 pound | ounces | 16 |
| 1 stone | pounds | 14 |
| 1 kilogram | pounds | 2.20462 |
| 1 ounce | grams | 28.3495 |
Common Weight Conversions
Kilograms to Pounds
- 1 kg = 2.205 lb
- 5 kg = 11.023 lb
- 10 kg = 22.046 lb
- 50 kg = 110.231 lb (average person)
- 70 kg = 154.324 lb
- 100 kg = 220.462 lb
Pounds to Kilograms
- 1 lb = 0.454 kg
- 10 lb = 4.536 kg
- 50 lb = 22.68 kg
- 100 lb = 45.36 kg
- 150 lb = 68.04 kg
- 200 lb = 90.72 kg
Grams to Ounces
- 1 g = 0.035 oz
- 28.35 g = 1 oz
- 100 g = 3.527 oz
- 250 g = 8.818 oz
- 500 g = 17.637 oz
Frequently Asked Questions
How many pounds are in a kilogram?
There are approximately 2.20462 pounds in one kilogram. This is the most common weight conversion used internationally. For quick mental math, you can multiply kilograms by 2.2 to get an approximate value in pounds.
How do I convert grams to ounces?
To convert grams to ounces, divide the gram value by 28.3495 or multiply by 0.035274. For example, 100 grams = 100 × 0.035274 = 3.527 ounces. This conversion is particularly useful in cooking when following recipes from different countries.
What is the difference between mass and weight?
Mass is the amount of matter in an object and remains constant regardless of location. Weight is the force exerted on that mass by gravity and can vary depending on where you are (e.g., you weigh less on the Moon). In everyday use, the terms are often used interchangeably.
What is a stone in weight measurement?
A stone is a unit of weight equal to 14 pounds or approximately 6.35 kilograms. It's commonly used in the UK and Ireland to measure body weight. For example, a person weighing 150 pounds would be about 10 stone 10 pounds.
What's the difference between a US ton and a metric ton?
A US ton (short ton) equals 2,000 pounds or about 907 kg. A metric ton (tonne) equals 1,000 kg or about 2,205 pounds. A UK ton (long ton) equals 2,240 pounds or about 1,016 kg. The metric ton is standard for international trade.
Weight Conversion Tips
- Quick kg to lb estimate: Double the kg value and add 10%. Example: 50 kg ≈ 100 + 10 = 110 lb (actual: 110.2 lb)
- Quick lb to kg estimate: Halve the pound value and subtract 10%. Example: 100 lb ≈ 50 - 5 = 45 kg (actual: 45.4 kg)
- Remember common benchmarks: 1 kg ≈ 2.2 lb, 1 oz ≈ 28 g, 1 lb = 16 oz
- For cooking: Many recipes use grams for precision. 1 cup of flour ≈ 125g, 1 cup of sugar ≈ 200g
- For body weight: Kilograms are more precise (no fractions needed) while pounds give a larger number
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