Kelvin to Celsius

SI Thermodynamics & Temperature Scale Relations

Because the degree Celsius and the Kelvin have identical interval sizes, the conversion between them is a pure additive translation of 273.15 units.

Primary Temperature Scale Reference Points

• Absolute Zero: 0.00 K = -273.15^

• Triple Point of Water: 273.16 K = 0.01^

• Freezing Point of Water: 273.15 K = 0.00^

• Standard Room Temperature: 293.15 K = 20.00^

• Human Body Temperature: 310.15 K = 37.00^

• Boiling Point of Water: 373.15 K = 100.00^

Equations

• T_^ = T_K - 273.15

• T_K = T_^ + 273.15

How to Use This Calculator

Enter your Temperature Value to Convert (e.g. 300.0) and Conversion Direction — choose from Kelvin to Celsius (K → °C / subtract 273.15), Celsius to Kelvin (°C → K / add 273.15). Results update instantly as you type — adjust any value to compare scenarios.

The Formula

Formula Reference: Kelvin to Celsius

Input variables:

temperatureValue — Temperature Value to Convert

conversionDirectionSelect — Conversion Direction

Computed outputs:

convertedTemperature — Converted Temperature

equivalentCelsius — Celsius (°C)

equivalentKelvin — Kelvin (K)

equivalentFahrenheit — Fahrenheit (°F)

equivalentRankine — Rankine (°R)

Mathematical relationships extracted from calculation logic:

c = Math.max(-273.15, val)

f = (c * 9.0 / 5.0) + 32.0

r = k * 1.8

Standard: NIST Handbook 44 and BIPM SI unit definitions

Worked Example

A gas chamber operating at 300 K maintains an ambient laboratory temperature of 26.85°C (80.33°F).

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.