A physics worksheet says 300 K. What Celsius value should I write in the lab notes?

Write 26.85°C. That is warmer than the 20°C to 25°C indoor range often used for laboratory conditions, so the converted value also helps the team interpret the result.

A gas-cylinder calculation is written in Celsius, but the model expects kelvins. What should I do?

Convert the Celsius reading to kelvins before using it in a temperature ratio such as PV = nRT. Celsius intervals and kelvin intervals have the same size, but their zero points are different.

A thermal-chamber CSV contains −5 K. Should I publish the Celsius conversion?

No. Negative values are outside the ordinary thermodynamic scale used here; 0 K is absolute zero. Check the chamber's unit label, sign, and sensor range before interpreting the record.

Kelvin to Celsius Converter

Enter a value to instantly convert between temperature units.

From

Precision4 dp

1 Kelvin = -272.15 Celsius

Key Formulas

Celsius → Fahrenheit

°F = f(°C)

Fahrenheit → Celsius

°C = f(°F)

Celsius → Kelvin

K = f(°C)

Kelvin → Celsius

°C = f(K)

Formula

°C = K − 273.15

Kelvin and Celsius intervals are the same size, but their zero points differ by 273.15. Subtract that offset when a scientific paper, laboratory result, or engineering calculation gives an absolute temperature in kelvins and you need a Celsius reading. Ordinary thermodynamic temperatures start at 0 K, so negative kelvin inputs are outside this converter's physical domain.

Source: BIPM SI Brochure, 9th edition (updated 2026), section 2.3.1

Reviewed by the Convert Calc editorial team · Last reviewed: 2026-08-01 · see our methodology

Frequently Asked Questions

Real-World Examples

A phase diagram marks 273.15 K, which converts to 0°C for comparison with an everyday temperature scale.

273.15 K = 0 °C

A laboratory procedure maintained at 298.15 K is labeled as 25°C on a Celsius controller.

298.15 K = 25 °C

A steam-table entry of 373.15 K is converted to 100°C for an operator using Celsius instruments.

373.15 K = 100 °C

A biological sample held at 310.15 K is documented as 37°C in the laboratory record.

310.15 K = 37 °C

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