To convert pounds into kilograms, you should divide the number of pounds by 2.20496, or 2.2 for an easier but slightly less accurate calculation. This is because a pound is lighter than a kilogram, so more pounds than kilograms are required to measure the same weight.
Therefore, to find out the equivalent of 168lb in kilograms, you should divide 168lb by 2.2. The answer to this calculation is 76.2035 kilograms, or 76.2 if you are rounding up.
If you search a phrase like "how to convert pounds into kilograms" on an internet search engine, then quite often, the top result will be an online calculator. These are usually free, safe, and easy to use, and allow you to choose your conversion and to type in the measurement you wish to convert. They are also accurate to at least three decimal places, meaning you may have to round the figure provided by the calculator up or down to make it a figure you can work with. There are also free online calculators available for converting other measurements, such as centimeters to inches, and degrees Celsius to degrees Fahrenheit. It can be confusing when recipes or instructions work in different types of measurements, but luckily the internet can provide formulas and calculators to help reduce any confusion.