Temperature Converter

Convert between Celsius (°C), Fahrenheit (°F), and Kelvin (K) instantly. Accurate temperature conversion for science, cooking, weather, and daily use.

Temperature Converter

Enter a temperature value and select the units to convert between Celsius, Fahrenheit, and Kelvin instantly. Perfect for scientific calculations, cooking, weather forecasting, and everyday conversions.

Convert Temperature

Enter the temperature value you want to convert
Select the temperature scale you want to convert to

Temperature Scales Explained

Three main temperature scales are used worldwide. Each has its own applications and reference points:

Celsius (°C)

Inventor: Anders Celsius (1742)

Reference Points:

  • 0°C = Water freezing point
  • 100°C = Water boiling point (at sea level)

Usage: Most countries worldwide, scientific research, everyday temperature measurement

Fahrenheit (°F)

Inventor: Daniel Gabriel Fahrenheit (1724)

Reference Points:

  • 32°F = Water freezing point
  • 212°F = Water boiling point (at sea level)

Usage: United States, Cayman Islands, Belize, everyday weather reporting in some countries

Kelvin (K)

Inventor: William Thomson (Lord Kelvin) (1848)

Reference Points:

  • 0 K = Absolute zero (-273.15°C)
  • 273.15 K = Water freezing point

Usage: Scientific research, physics, thermodynamics, absolute temperature measurements

Temperature Conversion Formulas

Temperature conversions use precise mathematical formulas. Here are the exact formulas for converting between different temperature scales:

Celsius to Fahrenheit: °F = (°C × 9/5) + 32
Fahrenheit to Celsius: °C = (°F - 32) × 5/9
Celsius to Kelvin: K = °C + 273.15
Kelvin to Celsius: °C = K - 273.15
Fahrenheit to Kelvin: K = (°F - 32) × 5/9 + 273.15
Kelvin to Fahrenheit: °F = (K - 273.15) × 9/5 + 32
Important: The Kelvin scale is an absolute temperature scale where 0 K represents absolute zero, the theoretical lowest possible temperature. Unlike Celsius and Fahrenheit, Kelvin does not use the degree symbol (°).

Common Temperature Conversions

Here are some commonly used temperature conversions for reference:

Celsius (°C) Fahrenheit (°F) Kelvin (K) Description
-273.15°C -459.67°F 0 K Absolute zero (theoretical minimum temperature)
-40°C -40°F 233.15 K The temperature where Celsius and Fahrenheit are equal
0°C 32°F 273.15 K Water freezing point (at sea level)
20°C 68°F 293.15 K Comfortable room temperature
37°C 98.6°F 310.15 K Average human body temperature
100°C 212°F 373.15 K Water boiling point (at sea level)
Quick Approximation: To quickly convert Celsius to Fahrenheit in your head, double the Celsius temperature, subtract 10%, then add 32. Example: 20°C ≈ (20×2=40, 40-4=36, 36+32=68°F).

Practical Applications

Cooking & Baking
  • Oven Temperatures: Recipes often use Fahrenheit in the US and Celsius elsewhere
  • Candy Making: Precise temperature control is critical (e.g., soft ball stage: 112-116°C / 234-240°F)
  • Meat Cooking: Safe internal temperatures vary by meat type
  • Baking: Exact temperatures crucial for chemical reactions in baking
Science & Engineering
  • Chemistry: Reaction rates double with every 10°C increase
  • Physics: Absolute zero (0 K) is a fundamental limit
  • Engineering: Material properties change with temperature
  • Medicine: Body temperature indicates health status
  • Weather Science: Climate models use Kelvin for accuracy

How to Use This Converter

Follow these simple steps to convert temperatures accurately:

Step 1: Enter Temperature

Input the temperature value you want to convert in the "Input Temperature" field.

  • You can enter positive or negative values
  • Use decimal points for precise values (e.g., 25.5)
  • Select the correct unit from the dropdown
Step 2: Select Target Unit

Choose the temperature scale you want to convert to from the "Convert To" dropdown.

  • °C (Celsius) - Metric system standard
  • °F (Fahrenheit) - US customary system
  • K (Kelvin) - Scientific absolute scale
Step 3: Convert

Click the "Convert Temperature" button to perform the conversion.

The calculator will:

  • Apply the correct conversion formula
  • Display the result with appropriate precision
  • Show the conversion formula if selected
  • Provide interpretation of the result
Step 4: Use Results

Use the converted temperature for your specific needs:

  • Cooking and baking recipes
  • Scientific calculations
  • Weather temperature comparisons
  • Travel planning between countries
  • Educational purposes