Temperature Converter

Convert temperatures between Celsius, Fahrenheit, Kelvin, Rankine, and Réaumur scales. Get instant, accurate results with our comprehensive temperature conversion tool.

✓ 5 Temperature Scales✓ Instant Results✓ Reference Points✓ Educational Content
Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin, and other temperature scales
Quick Conversions
Common temperature conversions
All Temperature Scales
0 °C converted to all scales
0.00 °C
Celsius
Water freezes at 0°C, boils at 100°C
32.00 °F
Fahrenheit
Water freezes at 32°F, boils at 212°F
273.15 K
Kelvin
Absolute temperature scale, 0K = absolute zero
491.67 °R
Rankine
Absolute scale using Fahrenheit degrees
0.00 °Ré
Réaumur
Historical scale, water freezes at 0°Ré, boils at 80°Ré
Temperature References
Important temperature points for reference
Absolute Zero
Theoretical lowest possible temperature
-273.15°C
-459.7°F
Liquid Nitrogen
Boiling point of nitrogen
-195.8°C
-320.4°F
Dry Ice
Sublimation point of solid CO₂
-78.5°C
-109.3°F
Water Freezing
Freezing point of water at sea level
0°C
32.0°F
Room Temperature
Comfortable indoor temperature
20°C
68.0°F
Human Body
Normal human body temperature
37°C
98.6°F
Water Boiling
Boiling point of water at sea level
100°C
212.0°F
Oven Temperature
Common baking temperature
200°C
392.0°F
About Temperature Scales

Celsius (°C)

The most widely used temperature scale worldwide. Water freezes at 0°C and boils at 100°C at standard atmospheric pressure.

Fahrenheit (°F)

Commonly used in the United States. Water freezes at 32°F and boils at 212°F at standard atmospheric pressure.

Kelvin (K)

The absolute temperature scale used in scientific applications. 0K represents absolute zero, the theoretical point where all molecular motion stops.

Rankine (°R)

An absolute temperature scale that uses Fahrenheit-sized degrees. Primarily used in engineering applications in the United States.

Réaumur (°Ré)

A historical temperature scale where water freezes at 0°Ré and boils at 80°Ré. Rarely used today but still found in some European contexts.

Understanding Temperature Conversion

Common Temperature Conversions

0°C (Water freezes)32°F
100°C (Water boils)212°F
37°C (Body temperature)98.6°F
-40°C-40°F

Conversion Formulas

°C to °F: (°C × 9/5) + 32
°F to °C: (°F - 32) × 5/9
°C to K: °C + 273.15
K to °C: K - 273.15

Frequently Asked Questions

What's the difference between Celsius and Fahrenheit?

Celsius is based on the freezing (0°C) and boiling (100°C) points of water, making it intuitive for everyday use. Fahrenheit uses 32°F for water's freezing point and 212°F for boiling, providing more precise measurements for weather temperatures.

When should I use Kelvin?

Kelvin is the absolute temperature scale used in scientific calculations, especially in physics and chemistry. It starts at absolute zero (0K = -273.15°C), where all molecular motion theoretically stops.

Why is -40°C equal to -40°F?

This is the unique point where the Celsius and Fahrenheit scales intersect. At -40 degrees, both scales show the same numerical value, making it a memorable reference point for temperature conversion.

What is absolute zero?

Absolute zero is the theoretical temperature at which all molecular motion stops. It equals -273.15°C, -459.67°F, or 0K. While impossible to reach in practice, it serves as the starting point for absolute temperature scales like Kelvin.