To convert pounds to kilograms, multiply by 0.453592 (or divide by 2.20462). So 150 lb = 68.04 kg and 200 lb = 90.72 kg. The factor is exact: 1 lb = 0.45359237 kg, defined internationally in 1959.
- Exact factor: 1 lb = 0.45359237 kg (international definition, fixed in 1959).
- 150 lb = 68.04 kg. 180 lb = 81.65 kg. 200 lb = 90.72 kg.
- Quick mental estimate: divide by 2.2 - result is 0.2% high.
- The US uses lbs for body weight; most other countries use kg.
How to Use This Converter
Type any pounds value in the lb field and the kg result appears instantly. You can also type in the kg field to convert back to lbs - it works in both directions without pressing a button.
How Do You Convert Pounds to Kilograms?
Multiply pounds by 0.453592. The exact value is 0.45359237 kg/lb - the international pound definition adopted in 1959 by the US, UK, and other countries.
$$\text{kg} = \text{lb} \times 0.453592$$
Worked examples: 100 lb = 45.36 kg. 120 lb = 54.43 kg. 150 lb = 68.04 kg. 180 lb = 81.65 kg. 200 lb = 90.72 kg.
Mental shortcut: divide by 2.2 for a quick estimate. For 165 lb: 165 ÷ 2.2 = 75 kg (actual: 74.84 kg). The error is under 0.2%.
How Do You Convert Kilograms to Pounds?
Multiply kilograms by 2.20462. See the dedicated kilograms to pounds converter for a kg-first reference table.
$$\text{lb} = \text{kg} \times 2.20462$$
Worked examples: 60 kg = 132.28 lb. 70 kg = 154.32 lb. 80 kg = 176.37 lb.
Pounds to Kilograms Reference Table
Common body weight values converted using the exact factor 0.45359237 kg/lb:
| Pounds (lb) | Kilograms (kg) | Context |
|---|---|---|
| 100 lb | 45.36 kg | Lower adult body weight |
| 110 lb | 49.90 kg | - |
| 120 lb | 54.43 kg | - |
| 130 lb | 58.97 kg | - |
| 140 lb | 63.50 kg | Average female body weight (US) |
| 150 lb | 68.04 kg | - |
| 160 lb | 72.57 kg | - |
| 170 lb | 77.11 kg | Average male body weight (US) |
| 180 lb | 81.65 kg | - |
| 200 lb | 90.72 kg | - |
| 220 lb | 99.79 kg | Near 100 kg threshold |
| 250 lb | 113.40 kg | - |
When Do You Need to Convert lbs to kg?
This conversion is most commonly needed when a US-based weight measurement must be interpreted in metric countries, or when filling out international forms. Common use cases:
- Health and medical - entering body weight in international health systems, BMI calculators, or clinical research data that uses kg.
- Fitness - US gym equipment and fitness apps often default to lbs; international programs use kg for load calculations.
- Shipping - converting parcel weights from US lbs to kg for international carriers and customs declarations.
- Sport - weight class divisions in international competitions (Olympics, FIFA, etc.) are specified in kg.
Frequently Asked Questions
How many kg is 150 pounds?
150 pounds equals 68.04 kg. Multiply 150 by 0.453592: 150 × 0.453592 = 68.039 kg. This is a commonly referenced body weight - roughly average female weight in the US.
How do you convert lbs to kg?
Multiply pounds by 0.453592. Quick mental check: divide by 2.2 (result is 0.2% high). For 200 lb: 200 ÷ 2.2 = 90.9 kg (actual: 90.72 kg).
How many kg is 200 pounds?
200 pounds equals 90.72 kg. This is just under the 100 kg threshold commonly referenced in weightlifting and medical contexts.
Is 1 pound more or less than 1 kg?
1 pound is less than 1 kg. One pound = 0.4536 kg, so it takes about 2.205 pounds to equal 1 kilogram. A kilogram is roughly 2.2 times heavier than a pound.