Kelvin to Celsius

Convert kelvin degrees to celsius degrees with ease.

Tool: Temperature Converter
Type: Unit Conversion

Kelvin to Celsius

Convert Kelvin to Celsius
Enter a valid Kelvin value (minimum: 0 K)
Key Features
  • Instant temperature conversion
  • Accurate calculations
  • Decimal precision support
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Conversion Formula

Formula

Celsius = Kelvin - 273.15

The Kelvin scale starts at absolute zero (−273.15°C), while Celsius starts at the freezing point of water (0°C = 273.15 K).

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Common Conversions

Kelvin (K) Celsius (°C) Description
0 K -273.15 °C Absolute zero
273.15 K 0 °C Water freezing point
293.15 K 20 °C Room temperature
298.15 K 25 °C Standard temperature
373.15 K 100 °C Water boiling point
273.15 K 0 °C Water freezing
310.15 K 37 °C Human body temperature

Understanding Temperature Scales

Kelvin (K)

The official SI unit of temperature used in science and engineering. It starts at absolute zero (0 K) where all molecular motion stops. Kelvin is used in thermodynamics, physics, and chemistry because it has no negative values.

Celsius (°C)

A temperature scale where 0°C is the freezing point of water and 100°C is the boiling point. It's the most commonly used scale for everyday temperature measurements and weather reports worldwide.

Key Difference

Absolute Zero: 0 K = -273.15°C. This is the lowest possible temperature where all molecular motion ceases. Celsius can be negative, but Kelvin cannot.

Scale Size

Both scales have the same unit size: a change of 1 K equals a change of 1°C. Only the zero points differ. This makes conversion straightforward.

Perfect For

Scientific Research

Convert temperatures in physics, chemistry, and laboratory experiments for reports and data analysis.

Education

Help students learn temperature conversions and understand different temperature scales.

Engineering

Use in engineering calculations and technical documentation requiring temperature conversions.

International Work

Convert temperatures when working with international colleagues or reading scientific literature.

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Complete Guide to Temperature Conversion

Understanding Temperature Scales

Temperature is a measure of thermal energy in a substance. Different temperature scales have been developed for various purposes: Kelvin for scientific work, Celsius for everyday use, and Fahrenheit primarily in the United States. The Kelvin scale is the international standard for scientific measurements and is the only temperature scale with a true absolute zero point.

The Kelvin Scale

  • Official SI Unit: Kelvin (K) is the base unit of temperature in the International System of Units
  • Absolute Zero: 0 K represents the theoretical lowest possible temperature (-273.15°C)
  • No Negative Values: All Kelvin temperatures are positive numbers
  • Science Standard: Used in physics, chemistry, and thermodynamics globally
  • Equal Intervals: One Kelvin degree equals one Celsius degree in size

The Celsius Scale

Celsius, also called Centigrade, is defined by two fixed points: the freezing point of water (0°C) and the boiling point of water (100°C) at standard atmospheric pressure. This makes it intuitive for everyday temperature measurements. The scale divides the interval between these points into 100 equal parts, making it easy to understand relative temperatures.

Why Convert Between Scales?

Scientists and engineers must convert between scales for various reasons: international collaboration requires using Kelvin in scientific contexts, laboratory work often involves both scales, data analysis may combine sources using different scales, and academic papers typically use Kelvin. Understanding both scales ensures accurate interpretation of temperatures and proper scientific communication.

Common Reference Points

  • Absolute Zero: 0 K = -273.15°C (lowest possible temperature)
  • Water Freezes: 273.15 K = 0°C
  • Room Temperature: 293.15 K ≈ 20°C
  • Body Temperature: 310.15 K ≈ 37°C
  • Water Boils: 373.15 K = 100°C
Pro Tip: Remember the simple formula: °C = K - 273.15. This applies to all conversions from Kelvin to Celsius, making manual calculations quick and easy.

Frequently Asked Questions

Absolute zero (0 K or -273.15°C) is the theoretical lowest possible temperature where all molecular motion stops. It's the zero point of the Kelvin scale and is used as a reference in thermodynamics.
Kelvin is the SI unit for temperature, has no negative values, starts at absolute zero, and is used in thermodynamic calculations. It's the international standard for scientific measurements.
No, Kelvin cannot be negative. 0 K is absolute zero, the lowest possible temperature. All Kelvin values are positive. Negative temperatures in Kelvin are physically impossible.
Yes, the formula is always: °C = K - 273.15. This constant (273.15) represents the offset between the two scales and never changes for any conversion.
Room temperature is approximately 20-25°C, which equals about 293-298 K. Standard conditions are often defined as 25°C (298.15 K).
Celsius was defined so water freezes at 0°C. Since Kelvin starts at absolute zero (-273.15°C), water freezes at 0 + 273.15 = 273.15 K.
This tool converts Kelvin to Celsius. To convert to Fahrenheit, first convert K to °C, then use: °F = (°C × 9/5) + 32.
Yes! Our Kelvin to Celsius Converter is completely free with no hidden fees, premium features, or registration requirements.

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