How to convert pounds to kilograms

Step-by-step explanation of how to convert pounds to kilograms, with formulas, worked examples, and a free online calculator.

To convert pounds to kilograms, divide by 2.20462. The formula is: kg = lb ÷ 2.20462. For example, 150 lb ÷ 2.20462 = 68.04 kg. Quick mental math: divide pounds by 2.2 for an approximate kilogram value. Common reference points: 100 lb ≈ 45 kg, 150 lb ≈ 68 kg, 200 lb ≈ 91 kg. The pound is part of the Imperial system, still widely used in the United States for body weight and grocery items.