Pounds to Kilograms Converter
Convert pounds to kilograms instantly. Type any lb value and get the exact kg equivalent. Includes a common weight table, formula, and body weight conversion examples.
Kilograms (kg)
Need the reverse? Convert kilograms to pounds →
Common Pounds to Kilograms Conversions
| pounds (lb) | kilograms (kg) | Note |
|---|---|---|
| 1 lb | 0.45 kg | 1 lb |
| 5 lb | 2.27 kg | 5 lbs |
| 10 lb | 4.54 kg | 10 lbs |
| 50 lb | 22.68 kg | 50 lbs |
| 100 lb | 45.36 kg | 100 lbs |
| 120 lb | 54.43 kg | 120 lbs |
| 150 lb | 68.04 kg | 150 lbs |
| 175 lb | 79.38 kg | 175 lbs |
| 200 lb | 90.72 kg | 200 lbs |
| 250 lb | 113.4 kg | 250 lbs |
The Pounds-to-Kilograms Formula
1 pound is defined as exactly 0.45359237 kilograms by the International Yard and Pound Agreement of 1959. To convert pounds to kilograms, multiply by 0.453592 (or divide by 2.20462). For example, 150 lbs × 0.453592 = 68.04 kg. A useful mental shortcut: divide pounds by 2.2 — this gives an answer within 0.2% of exact. Example: 200 lbs ÷ 2.2 ≈ 90.9 kg (exact: 90.72 kg).
Common Pounds-to-Kilograms Reference Points
For body weight: 100 lbs = 45.36 kg, 130 lbs = 58.97 kg, 150 lbs = 68.04 kg, 180 lbs = 81.65 kg, 200 lbs = 90.72 kg, 250 lbs = 113.40 kg. For weightlifting: a standard 45 lb plate = 20.41 kg; a 35 lb plate = 15.88 kg; a 25 lb plate = 11.34 kg; a 10 lb plate = 4.54 kg. For food: 1 pound of ground beef = 453.6 grams ≈ 0.454 kg. For shipping: a 10 lb package = 4.54 kg; a 50 lb box = 22.68 kg.
Why Kilograms Are the Standard for Medicine and Science
Drug dosages, infant birth weights, lab reference ranges, and body composition metrics are all expressed in kilograms in medical and scientific contexts — including in the United States. BMI (Body Mass Index), for example, is calculated using weight in kilograms divided by height in meters squared. TDEE calculations and protein intake recommendations (e.g., 0.8 g per kg of body weight) also use kilograms. Even US hospitals weigh patients in kilograms for medication dosing purposes. Knowing your weight in kg is practical for anyone interacting with medical, fitness, or nutritional data.
Frequently Asked Questions
How many kilograms is 1 pound?
1 pound equals exactly 0.45359237 kilograms, commonly rounded to 0.4536 kg. For mental math, divide pounds by 2.2 to get a close estimate.
How do I convert lbs to kg in my head?
Divide pounds by 2.2 for a quick estimate. Example: 160 lbs ÷ 2.2 ≈ 72.7 kg (exact: 72.57 kg). Alternatively, multiply by 0.45.
What is 150 pounds in kilograms?
150 lbs × 0.453592 = 68.04 kg. This is the weight of an average adult woman in the United States.
What is 200 pounds in kilograms?
200 lbs × 0.453592 = 90.72 kg. A 200-lb person weighs approximately 90.7 kg or just under 91 kg.