To convert pounds to kilograms, a simple conversion factor is used: 1 pound is equal to 0.453592 kilograms. This means you can calculate the equivalent weight in kilograms by multiplying the number of pounds by 0.453592. For example, if you want to convert 173 pounds, multiply 173 by 0.453592. The result is approximately 78.4706 kilograms. Therefore, 173 pounds is equivalent to 78.47 kg when rounded to two decimal places. This conversion method is commonly used in various contexts, such as fitness, healthcare, and travel, where knowing both metric and imperial weight units is essential.