LBS to KG Converter
Pounds to Kilograms Conversion Table
| Pounds (lb) | Kilograms (kg) |
|---|---|
| 1 lb | 0.453592 kg |
| 5 lb | 2.26796 kg |
| 10 lb | 4.53592 kg |
| 20 lb | 9.07184 kg |
| 50 lb | 22.6796 kg |
| 100 lb | 45.3592 kg |
| 120 lb | 54.43104 kg |
| 150 lb | 68.0388 kg |
| 180 lb | 81.64656 kg |
| 200 lb | 90.7184 kg |
| 250 lb | 113.398 kg |
| 300 lb | 136.0776 kg |
Convert pounds to kilograms instantly. Accurate lbs-to-kg converter with a reference table. Free, private, and works entirely in your browser.
How to Use LBS to KG Converter
- Enter the weight in pounds that you want to convert.
- The equivalent weight in kilograms appears instantly.
- Use the copy button to copy the result to your clipboard.
- Refer to the conversion table below for common pound-to-kilogram values.
What is Pounds to Kilograms Conversion?
Pounds to kilograms conversion transforms imperial mass measurements into the metric system used internationally. The pound (abbreviated lb, from the Latin "libra") is a unit of mass in the imperial system used primarily in the United States. The kilogram is the base unit of mass in the International System of Units (SI) and is used by the rest of the world. The international avoirdupois pound is legally defined as exactly 0.45359237 kilograms, a definition adopted in 1959 by the US, UK, and other Commonwealth countries.
The Conversion Formula
The formula is: kg = lbs x 0.453592. Alternatively, divide the pound value by 2.20462 for the same result. For quick mental math, divide by 2.2. For example, 150 lbs / 2.2 = approximately 68 kg (exact is 68.04 kg). Another mental shortcut: halve the pound value and subtract 10% of the result. For example, 200 lbs: half is 100, subtract 10% (10) = 90 kg (exact is 90.72 kg). This second method is less precise but can be done without a calculator in most situations.
Common Use Cases
- Healthcare (drug dosages are calculated per kilogram of body weight)
- International travel (airline baggage limits outside the US are in kilograms)
- Sports (Olympic weight classes and international competitions use kilograms)
- Aviation (fuel loads and payload calculations use metric units)
- Science and engineering (SI units require kilograms for mass)
- International shipping (customs declarations and weight limits in kg)
Why Healthcare Uses Kilograms
Medical dosing worldwide uses kilograms as the standard unit for calculating medication amounts. Drug dosages are expressed as milligrams per kilogram (mg/kg), making accurate weight conversion critical for patient safety. Even in US hospitals, patient weights are often recorded in kilograms specifically for medication calculations, since errors in conversion can lead to under-dosing or overdosing. Pediatric dosing is especially sensitive to weight accuracy because children's doses are almost always weight-based. Anesthesia calculations, chemotherapy protocols, and IV fluid rates all depend on the patient's weight in kilograms. This medical convention is one of the primary reasons why lbs-to-kg conversion remains one of the most important everyday conversions.
For the reverse conversion, use the Kilograms to Pounds Converter. For smaller weight conversions, try Ounces to Grams. For BMI calculations, see the BMI Calculator.