Select the Length tab, choose Inch (in) as the input unit and Centimeter (cm) as the output unit, then type your value. 1 inch equals exactly 2.54 centimeters. You can also type in the result field to convert backwards.

Select the Temperature tab. Fahrenheit to Celsius is pre-selected by default. Type your temperature and the result updates instantly. The formula is: °C = (°F − 32) × 5/9. For example, 98.6°F equals 37°C (normal body temperature).

Select the Weight tab, choose Pound (lb) as input and Kilogram (kg) as output. 1 pound equals approximately 0.4536 kilograms. For quick reference: 150 lbs ≈ 68 kg, 200 lbs ≈ 90.7 kg.

Yes. You can type in either the left or right field and the conversion works both ways. You can also click the swap button (⇆) to instantly reverse the units.

The US uses the Imperial system (inches, pounds, Fahrenheit), a legacy of British colonial measurements. Most of the world adopted the metric system (meters, kilograms, Celsius) because it is based on powers of 10 and easier to calculate. The US is one of only three countries that have not officially adopted the metric system.