Temperature converter
ConvertersNo. 17 / 24approved
One value, every scale. Type a number, pick its unit, and it becomes Celsius, Fahrenheit and Kelvin at once — with an honest opinion on how it feels.
−40 is where Celsius and Fahrenheit finally agree — and where you regret everything.
work surface
Math, not advice — results are indicative. Read the disclaimer.
most-used utilities
Room temperature
72 °F. The temperature the world agrees to disagree about.
Body temperature
98.6 °F. Your body's operating system, always online.
Boiling water
212 °F. The kettle's favourite number.
Freezing point
32 °F. Where water gets stubborn and ice gets invited.
Hot summer
95 °F. The temperature of every sidewalk in July.
Absolute zero
0 K. Even the atoms are done for the day.
pro tips
C to F fast: double it and add 30. To be right: ×9/5 and +32. Your call.
−40 is where Celsius and Fahrenheit finally agree — and where you regret everything.
Kelvin has no "degrees". It's already absolute, no decoration needed.
what it does
Type a number, pick its scale, and the other two update at the same time. Celsius, Fahrenheit and Kelvin — the whole thermometer in one screen, with a small opinion about how that temperature actually feels.
The conversion runs through Celsius, the scale that everyone quietly agrees on. Click any result to copy that particular value, because someone will always ask for the number in Fahrenheit.
Handy for cooking, weather and the eternal "is that hot or just British?" — the question that splits kitchens, continents and friendships.
Why three scales? Celsius for most of the planet, Fahrenheit for the holdouts, and Kelvin for the scientists and the cryogenically curious. They're just different rulers for the same heat — and the note under each card tells you how it actually feels.
quick answers
How do you convert Celsius to Fahrenheit?
Multiply by 9/5 and add 32. The widget does it live — and the note under each result tells you how it feels too.
What's the difference between Celsius and Kelvin?
Same scale, different zero: Kelvin starts at absolute zero (−273.15 °C). Add 273.15 to Celsius to get Kelvin.
When do Celsius and Fahrenheit match?
At −40°. They finally agree, and it's cold enough that you regret being right.
Why does it say "regret" for very cold temperatures?
Because −40 °C is −40 °F, and neither is a temperature you want to be standing in.