Temperature Converter
Use our free online temperature converter to switch instantly between Celsius, Fahrenheit, and Kelvin. Get accurate unit conversions for study, travel, cooking, science, and weather. Perfect for students, researchers, and everyday use with real-time temperature reference.
Water freezes at 0°C and boils at 100°C
Water freezes at 32°F and boils at 212°F
0K is absolute zero, water freezes at 273.15K
Enter a temperature to see conversion formulas
| Phenomenon | °C | °F | K |
|---|---|---|---|
| Absolute Zero | -273.15 | -459.67 | 0 |
| Water Freezes | 0 | 32 | 273.15 |
| Room Temp | 20-25 | 68-77 | 293-298 |
| Body Temp | 37 | 98.6 | 310.15 |
| Water Boils | 100 | 212 | 373.15 |
Celsius (°C)
Used in most countries worldwide. Water freezes at 0°C and boils at 100°C at sea level.
Fahrenheit (°F)
Primarily used in the United States. Water freezes at 32°F and boils at 212°F.
Kelvin (K)
The base unit of temperature in the International System of Units (SI). 0K is absolute zero.
Complete Guide to Temperature Conversion
Why Different Temperature Scales?
Different temperature scales were developed for different purposes. Celsius was designed around water's phase changes, Fahrenheit was based on a brine solution's freezing point, and Kelvin was developed for scientific measurements starting from absolute zero.
Practical Applications
Everyday Use
- Weather forecasts
- Cooking temperatures
- Home/office climate control
- Medical measurements
Scientific Use
- Chemical reactions
- Physics experiments
- Astronomical measurements
- Engineering calculations
Conversion Tips
- For quick Celsius to Fahrenheit estimates: Double and add 30 (approximate)
- Remember that -40°C = -40°F (the scales intersect at this point)
- Kelvin values are always positive (absolute zero is 0K)
- Temperature differences in Celsius and Kelvin are equal (1°C = 1K difference)
Professional Tips
- For scientific work, always use Kelvin for calculations
- When converting between scales, maintain appropriate significant figures
- Be aware of regional preferences when communicating temperatures
- Consider using temperature conversion apps for frequent conversions
Fahad Ahmad
Founder of CalculatorsKit · Full-Stack JavaScript Developer · SEO & Digital Product Creator
Fahad Ahmad is the founder of CalculatorsKit and a full-stack JavaScript developer with more than 10 years of experience building modern web applications and online tools. He specializes in developing fast, accurate, and user-friendly calculators that help people make informed decisions in finance, health, education, business, mathematics, construction, and everyday life.
Every calculator published on CalculatorsKit is carefully researched, tested, and designed for accuracy and ease of use. Using modern technologies including Next.js, React, Tailwind CSS, and Shadcn UI, Fahad focuses on creating privacy-friendly tools that work instantly in the browser without requiring downloads or registration.
In addition to building calculators, Fahad writes educational articles that explain formulas, calculation methods, financial concepts, and practical examples in simple language so students, professionals, and everyday users can better understand the results they receive.