The other point at which Celsius was set – 100 degrees Celsius – was defined as the boiling point of water. Since its definition, the Celsius scale has been redefined to peg it to Kelvin. Zero degrees Celsius is now defined as 273.15K. As one degree Celsius is equal to one Kelvin, boiling point of water is equal to 273.15 + 100 = 373.15 Kelvin. This table shows a select range of temperatures, converted from Celsius to Fahrenheit (C to F) - from absolute zero to the boiling point of water. Celsius To Fahrenheit Conversions; Celsius (°C) Fahrenheit (°F)-273.15 °C-459.67 °F: absolute zero: 0 °C: 32 °F: freezing point of water: 10 °C: 50 °F: 20 °C: 68 °F: 30 °C: 86 °F: 40 °C The Celsius and Kelvin scales are precisely related, with a one-degree change in Celsius being equal to a one degree-change in kelvin. The kelvin (and thus Celsius) is defined based on the Boltzmann constant, k, which equals 1.380649 × 10-23 when expressed in the unit J·K-1, a unit equivalent to kg·m 2 ·s-2 ·K-1. Convert Celsius to Fahrenheit and vice versa using Newark's temperature calculator. Our conversion chart also shows the formula so you can make temperature conversions manually. Temperature Conversion Calculator About. Celsius, or centigrade, is used to measure temperatures in most of the world. Water freezes at 0° Celsius and boils at 100° Celsius. Fahrenheit is a scale commonly used to measure temperatures in the United States. CujpTF.