Converters
Temperature Converter
Enter any temperature in Celsius, Fahrenheit, or Kelvin and see all three values instantly.
Celsius (°C)
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Fahrenheit (°F)
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Kelvin (K)
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Temperature Conversion Formulas
°C → °F
°F = (°C × 9/5) + 32
°F → °C
°C = (°F − 32) × 5/9
Kelvin
K = °C + 273.15
Understanding the Three Temperature Scales
Celsius (°C) is the standard scale for everyday temperature worldwide. Water freezes at 0°C and boils at 100°C at sea level. Fahrenheit (°F) is primarily used in the United States, where water freezes at 32°F and boils at 212°F.
Kelvin (K) is the scientific scale used in physics and chemistry. It begins at absolute zero — the lowest theoretically possible temperature — and uses the same degree size as Celsius. Because Kelvin starts at absolute zero, negative values are impossible, which makes it useful for thermodynamic calculations.
Frequently asked questions
How do I convert Celsius to Fahrenheit?
Use the formula: °F = (°C × 9/5) + 32. For example, 100°C = (100 × 1.8) + 32 = 212°F.
How do I convert Fahrenheit to Celsius?
Use the formula: °C = (°F − 32) × 5/9. For example, 98.6°F = (98.6 − 32) × 5/9 = 37°C.
What is Kelvin and how does it relate to Celsius?
Kelvin is the SI unit for thermodynamic temperature. It starts at absolute zero — the coldest possible temperature. K = °C + 273.15, so 0°C = 273.15 K.
What temperature is the same in Celsius and Fahrenheit?
The Celsius and Fahrenheit scales intersect at −40°. That is, −40°C equals −40°F. This is the only temperature point where both scales give the same reading.
What is absolute zero?
Absolute zero is 0 K, which equals −273.15°C or −459.67°F. It is the theoretical lowest possible temperature, where particles have minimal thermal motion.