Centigrade to Celsius

Temperature History & The 1948 CGPM Renaming

Swedish astronomer Anders Celsius proposed the 100-degree scale in 1742 (originally inverted with 0° as boiling and 100° as freezing, later inverted to modern form by Carl Linnaeus in 1744).

Scale Equivalents

• 1° Centigrade: 1^ (Exact Numerical Equivalence)

• Fahrenheit Equivalent: T_^ = (T_^ × 1.8) + 32

• Kelvin Absolute: T_K = T_^ + 273.15

• Rankine Absolute: T_^ = 1.8

How to Use This Calculator

Enter your Temperature in Centigrade (°C) (e.g. 100.0 in °C). Results update instantly as you type — adjust any value to compare scenarios.

The Formula

Formula Reference: Centigrade to Celsius

Input variables:

centigradeTemperature — Temperature in Centigrade (°C)

Computed outputs:

equivalentCelsius — Temperature in Celsius (°C)

equivalentFahrenheit — Temperature in Fahrenheit (°F)

equivalentKelvin — Temperature in Kelvin (K)

equivalentRankine — Temperature in Rankine (°R)

Mathematical relationships extracted from calculation logic:

f = (c * 1.8) + 32.0

k = c + 273.15

r = (c + 273.15) * 1.8

Standard: NIST Handbook 44 and BIPM SI unit definitions

Worked Example

A thermometer reading 100 degrees Centigrade indicates exactly 100 degrees Celsius (212 °F), representing the boiling point of pure water at sea-level atmospheric pressure.

Understanding Your Result

Key temperature reference points: Absolute zero 0 K / −273.15°C / −459.67°F. Water freezes at 0°C / 32°F / 273.15 K. Water boils at 100°C / 212°F / 373.15 K at 1 atm (sea level). Human body temperature 37°C / 98.6°F. Oven baking range: 150–230°C / 300–450°F. Kelvin is always used in thermodynamic equations — never negative. Temperature differences in Celsius and Kelvin are equal: a 10°C rise = a 10 K rise.