Converter for temperature

Convert between Celsius (°C), Fahrenheit (°F), and Kelvin (K). Type in any box—the other value updates instantly.

Quick temperature converters

Common temperature conversions (examples)

°C°F
-40-40
032
2068
3798.6
100212

How temperature conversions work

Celsius (°C) sets water’s freezing and boiling points to 0° and 100° at 1 atm. Fahrenheit (°F) uses 32° and 212° for the same points. Kelvin (K) shares increments with °C but starts at absolute zero: 0 K = −273.15 °C.

We compute with exact constants (273.15 and 459.67) and round the display for readability.

All temperature converters

Temperature conversion FAQs

What is absolute zero?

0 K (−273.15 °C, −459.67 °F), where thermal motion is minimal.

Why do °C and K have the same step size?

Both use increments of 1; only the zero point differs by 273.15.

Is 98.6 °F exactly 37 °C?

Yes, 98.6 °F equals 37.0 °C by definition.