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Convert between Fahrenheit, Celsius, and Kelvin with quick reference tables and formulas.
Temperature conversion translates values between Fahrenheit, Celsius, and Kelvin scales using mathematical formulas. These three scales are used worldwide in everyday life, science, and engineering.
°C = (°F - 32) × 5/9
°F = (°C × 9/5) + 32
K = °C + 273.15
°C = K - 273.15
| Description | °F | °C | K |
|---|---|---|---|
| Absolute zero | -459.67 | -273.15 | 0 |
| Water freezes | 32 | 0 | 273.15 |
| Room temperature | 68 | 20 | 293.15 |
| Body temperature | 98.6 | 37 | 310.15 |
| Water boils | 212 | 100 | 373.15 |
| Oven (baking) | 350 | 177 | 450.15 |
Used primarily in the United States. Water freezes at 32°F and boils at 212°F at standard atmospheric pressure.
Used by most countries worldwide. Based on water: freezes at 0°C and boils at 100°C at standard pressure.
The SI unit of temperature, used in science. Starts at absolute zero (0 K), with the same increment size as Celsius.
Formula
°C = (°F − 32) × 5/9 | °F = (°C × 9/5) + 32 | K = °C + 273.15°C = Celsius — SI-adjacent scale where 0 = water freezes, 100 = water boils at sea level
°F = Fahrenheit — US customary scale where 32 = water freezes, 212 = water boils
K = Kelvin — absolute thermodynamic scale with 0 K = absolute zero (−273.15°C)
Worked Example
Convert 98.6°F (body temperature) to Celsius and Kelvin
Did you know? −40° is the only temperature that is identical in both Fahrenheit and Celsius. Anders Celsius originally designed his scale with 100 at freezing and 0 at boiling — it was inverted after his death.
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