Temperature Converter Online
Free online temperature converter. Convert between Celsius (°C), Fahrenheit (°F), and Kelvin (K). Instant, accurate conversions with formulas explained.
⇄
Tip: Click any result row to instantly copy its value to clipboard
💡 Definition
Temperature Converter
- Temperature measures the average kinetic energy of particles in a substance.
- Celsius (°C) is used worldwide, Fahrenheit (°F) is used in the US, and Kelvin (K) is the SI unit used in science.
- Unlike other unit conversions, temperature conversions use formulas, not simple ratios.
📖 How to use
Step by Step
- Enter a temperature and choose your source unit from the Convert From dropdown
- All converted values appear instantly in the results grid
- The source unit row is highlighted in purple for clarity
- Click any result row to copy that value to your clipboard
🎯 Use cases
When to use
- Converting weather temperatures between systems
- Scientific experiments and lab reports
- Cooking with international recipes
- HVAC and engineering calculations
Frequently Asked Questions
How do you convert Celsius to Fahrenheit?▾
Multiply the Celsius value by 9/5, then add 32. Formula: °F = (°C × 9/5) + 32. For example, 100°C = 212°F.
What is absolute zero?▾
Absolute zero is 0 Kelvin, equal to −273.15°C or −459.67°F. It is the theoretical lowest temperature where all molecular motion stops.
Why does the US use Fahrenheit?▾
The US adopted Fahrenheit before the metric system became widespread. Daniel Fahrenheit developed the scale in 1724, and it became the standard in English-speaking countries. Most nations later switched to Celsius.