Kelvin is the SI base unit for temperature. It's an absolute temperature scale where 0 K is absolute zero (the lowest possible temperature). Unlike Celsius and Fahrenheit, Kelvin has no negative values.

How do I convert Celsius to Kelvin?

Add 273.15 to Celsius to get Kelvin. For example, 25°C = 25 + 273.15 = 298.15 K. The conversion is: K = °C + 273.15.

How do I convert Fahrenheit to Kelvin?

First convert Fahrenheit to Celsius: °C = (°F - 32) × 5/9, then add 273.15. For example, 77°F = 25°C = 298.15 K.

What is absolute zero in different scales?

Absolute zero is 0 K, which equals -273.15°C or -459.67°F. This is the theoretical lowest possible temperature where all molecular motion stops.

Kelvin is used in scientific calculations because it's an absolute scale starting from absolute zero. It's essential for physics, chemistry, and thermodynamics calculations.

Can Kelvin be negative?

No, Kelvin cannot be negative. Absolute zero (0 K) is the lowest possible temperature. All temperatures in Kelvin are positive values.

Temperature Converter

Convert between Kelvin, Celsius, and Fahrenheit scales. Perfect for scientific calculations and thermodynamics.

Converter

Result

Kelvin (K): 0
Celsius (°C): 0
Fahrenheit (°F): 0

Formula & Guide

Conversion Formulas

K

Celsius to Kelvin

K = °C + 273.15

Add 273.15 to Celsius to get Kelvin

K

Fahrenheit to Kelvin

K = (°F - 32) × 5/9 + 273.15

Convert via Celsius to get Kelvin

Step-by-Step Scenario

Example Scenario

Temperature

25°C

Target Scale

Kelvin

1

Apply Conversion Formula

K = °C + 273.15

2

Calculate

K = 25 + 273.15

K = 298.15

Additional Examples

Absolute Zero

Kelvin: 0 K

Celsius

0 - 273.15 = -273.15°C

Room Temperature

Celsius: 20°C

Kelvin

20 + 273.15 = 293.15 K

Characteristics of Kelvin Conversion

Absolute Scale

Kelvin is an absolute temperature scale starting from absolute zero (0 K). No negative values possible.

Scientific Standard

Kelvin is the SI base unit for temperature, essential for physics, chemistry, and thermodynamics.

Precise Conversion

Conversion uses exact factor: 273.15. This is the difference between Celsius and Kelvin scales.

Three-Way Conversion

Convert between Kelvin, Celsius, and Fahrenheit. All three scales are calculated simultaneously.

Important Notes

Kelvin is an absolute temperature scale. 0 K is absolute zero, the theoretical lowest possible temperature.
The conversion factor between Celsius and Kelvin is exactly 273.15. K = °C + 273.15.
Kelvin cannot be negative. All temperatures in Kelvin are positive values starting from 0 K.
For scientific calculations, Kelvin is preferred because it's an absolute scale. Ideal gas law and other physics formulas use Kelvin.
Room temperature is approximately 293.15 K (20°C). Body temperature is approximately 310.15 K (37°C).

Frequently Asked Questions

Find answers to common questions about Kelvin temperature conversion.