Weight Calculator Online Free Tool
Weight Calculator
Weight Converter
Common Weights Reference
Astronomical Masses
Particle Masses
Everyday Objects Weight Comparison
Quick Conversion Tips
- 1 kg = 1,000 g = 1,000,000 mg
- 1 metric ton = 1,000 kg
- 1 g = 1,000 mg = 1,000,000 µg
- 1 lb = 16 oz = 7,000 grains
- 1 stone = 14 lb
- 1 short ton (US) = 2,000 lb
- 1 long ton (UK) = 2,240 lb
- 1 kg ≈ 2.205 lb
- 1 lb ≈ 0.454 kg
- 1 oz ≈ 28.35 g
- US nickel = 5 g
- US penny = 2.5 g
- 1 liter of water ≈ 1 kg
The weight calculator converts between pounds, kilograms, ounces, grams, stones, and other weight/mass units. Whether you are converting body weight, measuring ingredients, shipping packages, or doing scientific calculations, enter your value and units to get an instant conversion.
Weight Unit Conversions
| Unit | = Pounds | = Kilograms | = Ounces |
|---|---|---|---|
| 1 pound (lb) | 1 | 0.454 | 16 |
| 1 kilogram (kg) | 2.205 | 1 | 35.27 |
| 1 ounce (oz) | 0.0625 | 0.0284 | 1 |
| 1 gram (g) | 0.00220 | 0.001 | 0.0353 |
| 1 stone (UK) | 14 | 6.350 | 224 |
| 1 ton (US short) | 2,000 | 907.2 | 32,000 |
Common Weight References
Having reference points helps quickly check if conversions make sense.
| Item | Approximate Weight |
|---|---|
| US nickel | 5 grams |
| Slice of bread | 28 grams (1 oz) |
| Can of soda | 355 mL / 369 grams |
| Smartphone | 170-200 grams |
| Bag of flour (US) | 5 lbs (2.27 kg) |
| Average adult (US) | 170 lbs (77 kg) |
Frequently Asked Questions
How many pounds in a kilogram?⌄
There are 2.20462 pounds in one kilogram. The quick approximation: multiply kilograms by 2.2 to get pounds. Divide pounds by 2.2 to get kilograms. Example: 70 kg × 2.2 = 154 lbs.
What is a stone (unit of weight)?⌄
A stone is a unit of weight equal to 14 pounds (6.35 kg), used primarily in the UK and Ireland for body weight. A person weighing 11 stone is 154 pounds or 70 kg. The stone is rarely used in scientific or commercial contexts outside the UK; kilograms or pounds are used instead.
What is the difference between weight and mass in scientific contexts?⌄
In physics, mass (kg) is intrinsic to the object. Weight (Newtons) is the force of gravity acting on that mass. On Earth's surface, 1 kg of mass has a weight of about 9.81 Newtons. In everyday use, "weight" and "mass" are used interchangeably because we measure them on Earth where gravity is constant.
How do I convert stone and pounds to kilograms?⌄
Multiply stones by 14 to get total pounds, then multiply total pounds by 0.4536 to get kilograms. Or: (Stones × 14 + Pounds) × 0.4536. Example: 11 stone 6 pounds = (11×14 + 6) × 0.4536 = (154+6) × 0.4536 = 160 × 0.4536 = 72.6 kg.