Weight Converter (kg to lbs, Grams to Ounces)
Convert kilograms to pounds, grams to ounces, stones, metric tonnes and troy ounces instantly. Mixed stone-and-pound readouts, a full unit matrix and step-by-step formulas based on the exact international pound.
Real-World Benchmarks
Multi-Unit Conversion Matrix
| Group | Measurement | Symbol | Equivalent Value |
|---|---|---|---|
| Metric (SI) | Microgram | µg | 1.0000E9 |
| Metric (SI) | Milligram | mg | 1,000,000 |
| Metric (SI) | Gram | g | 1,000 |
| Metric (SI) | Kilogram | kg | 1 |
| Metric (SI) | Metric Tonne | t | 0.001 |
| Imperial & US Customary | Ounce | oz | 35.274 |
| Imperial & US Customary | Pound | lb | 2.2046 |
| Imperial & US Customary | Stone | st | 0.1575 |
| Imperial & US Customary | Short Ton (US) | US ton | 0.0011 |
| Imperial & US Customary | Long Ton (UK) | UK ton | 0.001 |
| Precious Metals & Gems | Troy Ounce | oz t | 32.1507 |
| Precious Metals & Gems | Carat | ct | 5,000 |
| Precious Metals & Gems | Grain | gr | 15,432.3584 |
Step-by-Step Mathematical Explanation
- 1 lb equals 0.45359237 kg, so divide by that factor: 1 ÷ 0.45359237 = 2.204623 lb.
- Direct factor: 1 kg = 2.20462262 lb.
Essential Conversion Factors
Kilogram: SI base unit of mass — body weight and groceries
Quick Answer & Key Weight Formulas
Direct Answer: To convert kilograms to pounds, multiply by 2.20462: lb = kg × 2.20462. To convert pounds to kilograms, multiply by 0.45359237, the exact international definition: kg = lb × 0.45359237. One ounce is 28.35 grams (g = oz × 28.3495), and one stone is 14 pounds or 6.35 kg.
Understanding Mass Units & Conversion Math
Since the 1959 International Yard and Pound Agreement, the avoirdupois pound has been defined as exactly 0.45359237 kg. Every imperial mass unit — ounce, stone, short ton and long ton — is a fixed multiple of that pound, so any conversion reduces to one exact multiplication through the kilogram.
1. Kilograms to Pounds (kg → lb)
A kilogram is heavier than a pound, so the number gets larger. Divide by the pound's definition — or multiply by its reciprocal, 2.20462262:
Example: 75 kg × 2.20462 = 165.35 lb.
2. Pounds to Kilograms (lb → kg)
Going the other way uses the exact legal factor directly, so there is no rounding at all until the final display:
Example: 150 lb × 0.45359237 = 68.04 kg.
Quick Mental Math: Double It and Add 10%
To estimate pounds from kilograms without a calculator, double the kilograms and add 10% of the result. It lands within 0.3% of the exact answer:
For 70 kg: 70 × 2 = 140; 140 + 14 = 154 lb (exact value: 154.32 lb).
Common Weight Benchmarks
| Object | Metric | Imperial | Significance |
|---|---|---|---|
| Sheet of Paper | 5 g | 0.18 oz | A4 at 80 g/m² — standard office paper |
| Bag of Flour | 1 kg | 2.2 lb | Standard European retail bag |
| Newborn Baby | 3.5 kg | 7 lb 11 oz | Average healthy birth weight |
| Adult Person | 70 kg | 154.3 lb (11 st 0.3 lb) | Reference adult body mass |
| Gold Bar | 12.44 kg | 400 oz t | London Good Delivery bar |
| Compact Car | 1,300 kg | 2,866 lb | Typical curb weight |
| Blue Whale | 150 t | 165 US tons | Largest animal ever recorded |
Kilograms to Pounds Chart (kg to lbs)
| kg | lb |
|---|---|
| 0.5 | 1.1 |
| 1 | 2.2 |
| 1.1 | 2.43 |
| 1.3 | 2.87 |
| 1.5 | 3.31 |
| 2 | 4.41 |
| 2.5 | 5.51 |
| 3 | 6.61 |
| 3.3 | 7.28 |
| 3.5 | 7.72 |
| 4 | 8.82 |
| 5 | 11.02 |
| 10 | 22.05 |
| 15 | 33.07 |
| 20 | 44.09 |
| 25 | 55.12 |
| 30 | 66.14 |
| 40 | 88.18 |
| 50 | 110.23 |
| 60 | 132.28 |
| 70 | 154.32 |
| 75 | 165.35 |
| 80 | 176.37 |
| 90 | 198.42 |
| 100 | 220.46 |
| 150 | 330.69 |
Pounds to Kilograms Chart (lbs to kg)
| lb | kg |
|---|---|
| 1 | 0.45 |
| 2 | 0.91 |
| 2.2 | 1 |
| 3 | 1.36 |
| 4 | 1.81 |
| 5 | 2.27 |
| 10 | 4.54 |
| 15 | 6.8 |
| 20 | 9.07 |
| 25 | 11.34 |
| 30 | 13.61 |
| 40 | 18.14 |
| 50 | 22.68 |
| 60 | 27.22 |
| 70 | 31.75 |
| 80 | 36.29 |
| 100 | 45.36 |
| 120 | 54.43 |
| 150 | 68.04 |
| 180 | 81.65 |
| 200 | 90.72 |
| 250 | 113.4 |
Pounds to Grams Chart (lb to g)
| lb | g |
|---|---|
| 0.1 | 45.4 |
| 0.25 | 113.4 |
| 0.3 | 136.1 |
| 0.5 | 226.8 |
| 0.75 | 340.2 |
| 1 | 453.6 |
| 1.5 | 680.4 |
| 2 | 907.2 |
| 2.2 | 997.9 |
| 2.5 | 1,134 |
| 3 | 1,360.8 |
| 3.5 | 1,587.6 |
| 4 | 1,814.4 |
| 5 | 2,268 |
| 10 | 4,535.9 |
Frequently Asked Questions
How many pounds are in a kilogram?
One kilogram equals 2.20462262 pounds. The factor comes from the exact definition 1 lb = 0.45359237 kg, so 1 ÷ 0.45359237 = 2.20462262.
What is the difference between mass and weight?
Mass is the amount of matter in an object and is measured in kilograms or pounds. Weight is the force gravity exerts on that mass, measured in newtons. In everyday use — scales, groceries, shipping — "weight" means mass, which is what this converter handles.
How much is a stone in kilograms and pounds?
One stone is exactly 14 pounds, or 6.35029318 kg. Stones are still used for body weight in the UK and Ireland, usually written as stones and pounds, e.g. 11 st 4 lb.
Is a troy ounce the same as a regular ounce?
No. A troy ounce (31.1035 g) is about 9.7% heavier than the everyday avoirdupois ounce (28.3495 g). Gold, silver and platinum prices are always quoted per troy ounce.
How many grams are in an ounce?
One avoirdupois ounce is exactly 28.349523125 grams, usually rounded to 28.35 g. A pound contains 16 ounces, or 453.59 g.