Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin instantly. Enter a temperature in any unit and see all conversions at once. Includes formulas, common references, and quick conversion links. Free and private.
Quick Conversions
Reference Table
| Description | °C | °F | K |
|---|---|---|---|
| Absolute Zero | −273.15 | −459.67 | 0 |
| Water Freezes | 0 | 32 | 273.15 |
| Room Temperature | 20 | 68 | 293.15 |
| Body Temperature | 37 | 98.6 | 310.15 |
| Water Boils | 100 | 212 | 373.15 |
| Oven (Moderate) | 180 | 356 | 453.15 |
How Temperature Conversion Works
This temperature converter handles three scales: Celsius (°C), Fahrenheit (°F), and Kelvin (K). Celsius is used worldwide for everyday temperatures, Fahrenheit is primarily used in the United States, and Kelvin is the SI unit used in science. Enter a value in any unit to see all three conversions instantly.
Temperature Conversion Formulas
°C to °F: °F = (°C × 9/5) + 32
°F to °C: °C = (°F − 32) × 5/9
°C to K: K = °C + 273.15
°F to K: K = (°F − 32) × 5/9 + 273.15
Celsius to Fahrenheit
To convert Celsius to Fahrenheit, multiply by 9/5 (or 1.8) and add 32. For example, 100°C = (100 × 1.8) + 32 = 212°F. A quick mental trick: double the Celsius value and add 30 for a rough estimate. This is accurate within a few degrees for everyday temperatures.
Fahrenheit to Celsius
To convert Fahrenheit to Celsius, subtract 32 and multiply by 5/9 (or divide by 1.8). For example, 72°F = (72 − 32) / 1.8 = 22.2°C. The crossover point where both scales read the same is −40° (−40°C = −40°F).
Kelvin Scale
The Kelvin scale starts at absolute zero (−273.15°C) — the coldest possible temperature where all molecular motion stops. It uses the same increment size as Celsius (1 K = 1°C), just offset by 273.15. Kelvin is used in physics, chemistry, astronomy, and engineering because it starts at a natural zero point.