Temperature Converter
Convert temperature instantly across 5 scales — type once, see every conversion update live.
⚡ Instant results
🌐 5 scales supported
🆓 100% free, no sign-up
⚠️ Below absolute zero — this temperature is not physically possible.
Converted to every scale:
📌 Quick Reference — Common Conversions
0°C (freezing point of water)32°F
100°C (boiling point of water)212°F
37°C (human body temperature)98.6°F
−40° (crossover point)−40°F
0°C273.15 K
0 K (absolute zero)−273.15°C
20°C (room temperature)68°F
0°F−17.78°C
❓ Frequently Asked Questions
How do I convert Celsius to Fahrenheit?
Multiply by 9/5 (1.8) and add 32. For example, 20°C × 1.8 + 32 = 68°F.
How do I convert Fahrenheit to Celsius?
Subtract 32, then multiply by 5/9. For example, (68°F − 32) × 5/9 = 20°C.
What temperature reads the same in Celsius and Fahrenheit?
−40 degrees — at exactly −40, the Celsius and Fahrenheit scales cross and read the same number.
What is absolute zero?
Absolute zero is 0 Kelvin, equal to −273.15°C or −459.67°F — the coldest temperature theoretically possible.
Instant & live
Every scale updates as you type — no "Convert" button, no waiting.
5 scales supported
Celsius, Fahrenheit, Kelvin, Rankine, and Réaumur.
Private by design
Runs entirely in your browser. Nothing is ever uploaded or logged.