Converter for temperature
Convert between Celsius (°C), Fahrenheit (°F), and Kelvin (K). Type in any box—the other value updates instantly.
Quick temperature converters
-
°C ↔ °F
Formulas:
°F = °C × 9/5 + 32
•°C = (°F − 32) × 5/9
-
°C ↔ K
Formulas:
K = °C + 273.15
•°C = K − 273.15
-
°F ↔ K
Formulas:
K = (°F + 459.67) × 5/9
•°F = K × 9/5 − 459.67
Common temperature conversions (examples)
°C | °F |
---|---|
-40 | -40 |
0 | 32 |
20 | 68 |
37 | 98.6 |
100 | 212 |
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.
- °F ↔ °C:
°F = °C × 9/5 + 32
•°C = (°F − 32) × 5/9
- °C ↔ K:
K = °C + 273.15
•°C = K − 273.15
- °F ↔ K:
K = (°F + 459.67) × 5/9
•°F = K × 9/5 − 459.67
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.