Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin, Rankine, Delisle, Reaumur and Romer. Results update instantly. Last updated: June 2026.
Popular Temperature Conversions
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Temperature Conversion Formulas
Reference Temperatures
| Condition | °C | °F | K |
|---|---|---|---|
| Water boils | 100 | 212 | 373.15 |
| Body temperature | 37 | 98.6 | 310.15 |
| Room temperature | 22 | 71.6 | 295.15 |
| Water freezes | 0 | 32 | 273.15 |
| Absolute zero | -273.15 | -459.67 | 0 |
Frequently Asked Questions
How do I convert Celsius to Fahrenheit?
Multiply by 9/5 (which is 1.8) and then add 32. Formula: °F = (°C × 1.8) + 32. Example: 25°C = (25 × 1.8) + 32 = 45 + 32 = 77°F. A rough mental estimate: double the Celsius value and add 30.
What is 37 degrees Celsius in Fahrenheit?
37°C = 98.6°F, which is normal human body temperature. Formula: (37 × 1.8) + 32 = 66.6 + 32 = 98.6°F.
What is absolute zero?
Absolute zero is the theoretical minimum temperature: -273.15°C, -459.67°F, and 0 Kelvin. At absolute zero, particles have the minimum possible thermal motion. It is physically impossible to reach exactly absolute zero, though scientists have come extremely close in laboratory conditions.
How do I convert Fahrenheit to Kelvin?
Convert to Celsius first using °C = (°F - 32) × 5/9, then add 273.15 to get Kelvin. Example: 212°F to Kelvin: (212 - 32) × 5/9 = 100°C + 273.15 = 373.15 K.
At what temperature are Celsius and Fahrenheit the same?
Celsius and Fahrenheit are equal at -40 degrees. -40°C = -40°F. This is the only point where both scales give the same numerical value. You can verify this: (-40 × 1.8) + 32 = -72 + 32 = -40.