Temperature Converter

Convert between Celsius, Fahrenheit, and Kelvin in real time. Type a value in any box and the other two update instantly.

The formulas

Handy reference points

Everything is calculated in your browser — nothing is uploaded, and it works offline once loaded.

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Frequently asked questions

What is 25°C in Fahrenheit?

25 °C is 77 °F, using the formula (25 × 9/5) + 32 = 77.

What is normal body temperature in Fahrenheit?

About 98.6 °F, which is 37 °C.

What is absolute zero?

Absolute zero is the lowest possible temperature: 0 Kelvin, or −273.15 °C (−459.67 °F).