Temperature Converter
What Are Temperature Scales?
Temperature is a measure of how hot or cold something is, and different scales have been developed to quantify it. Celsius (°C), created by Anders Celsius in 1742, is used worldwide for everyday purposes and is based on water's freezing (0°C) and boiling (100°C) points. Fahrenheit (°F), developed by Daniel Fahrenheit in 1724, is primarily used in the United States. Kelvin (K), the SI unit for scientific measurement, starts at absolute zero — the lowest theoretically possible temperature where all molecular motion stops (0 K = −273.15°C).
How to Use
Enter a temperature value and select the input unit. All three conversions (Celsius, Fahrenheit, and Kelvin) are displayed instantly as you type.
Temperature Scales
Celsius: water freezes at 0° and boils at 100°. Fahrenheit: water freezes at 32° and boils at 212°. Kelvin: absolute zero is 0K (−273.15°C). The formulas are: °F = °C × 9/5 + 32, K = °C + 273.15.
Common Use Cases
- Cooking — convert recipe temperatures between Celsius and Fahrenheit
- Travel — understand weather forecasts in unfamiliar temperature scales
- Science — convert between Celsius and Kelvin for lab work
- Healthcare — convert body temperature readings between scales
- HVAC and engineering — work with specifications in different unit systems
Quick Reference
Some handy reference points: body temperature is approximately 37°C / 98.6°F / 310 K. Room temperature is about 20-22°C / 68-72°F. Water boils at 100°C / 212°F / 373 K at sea level. A comfortable swimming pool is around 26-28°C / 79-82°F. The intersection point where Celsius and Fahrenheit read the same is −40°.
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