Temperature Unit Converter
Effortlessly switch between temperature units. Our tool provides instant and accurate conversions for your needs.
Fast, Free, Private Temperature Converter (Offline)
Convert temperatures instantly Celsius (°C), Fahrenheit (°F), and Kelvin (K). 100% client side, lifetime free, unlimited use. No uploads, no sign ups, truly private.
Top, fast, best-in-class, and unlimited. Your information is 100% confidential and secure.
Why people love this temperature converter
Offline & secure
Runs entirely in your browser. Your values never leave your device.
Unlimited & free forever
No accounts, no limits convert as much as you want.
Fast & simple
Pick units, type a value, and see results instantly with clear precision.
Works everywhere
Modern browsers on Windows, Mac, Linux, and mobile devices.
No data collected
100% client-side processing keeps your data private.
Accurate results
Standard conversion formulas with smart rounding for readability.
Popular uses worldwide
Weather & travel
Quickly convert local forecasts between °C and °F.
Cooking & baking
Adjust oven temperatures across recipes from different regions.
Science & lab
Switch between °C and K for experiments and reports.
HVAC & engineering
Convert temperatures for calculations and diagnostics.
Education
Learn the relationships between °C, °F, and K.
IoT & sensors
Normalize readings from mixed unit systems.
How to convert temperature units
- Select your “From” unit (°C, °F, or K).
- Enter a value (e.g., 25).
- Select your “To” unit.
- See instant results and the 1 unit summary below.
- Use “Reset” to start again.
Tip: Change either side both fields update intelligently.
Supported units
Best practices
- Use the correct symbols: °C and °F include the degree symbol; Kelvin is written as K (no degree symbol).
- Kelvin cannot be negative 0 K is absolute zero.
- Round only at the end if you’ll do further calculations.
- Keep the original values for auditing and records.
Frequently Asked Questions
How do I convert °C to °F?
Use F = (C × 9/5) + 32. Example: 25 °C = 77 °F.
How do I convert °F to °C?
Use C = (F − 32) × 5/9. Example: 68 °F = 20 °C.
How do I convert °C to K?
Use K = C + 273.15. Example: 0 °C = 273.15 K.
Is it private and secure?
Yes. Everything runs locally in your browser no uploads, no tracking, no servers.
Is it really free and unlimited?
Yes. Lifetime free, unlimited conversions, and no sign ups.
How accurate are results?
We use precise constants (e.g., 273.15) and smart rounding for readability.
Global availability (GEO)
Built for users worldwide: USA, UK, Canada, Australia, India, EU (Germany, France, Spain, Italy, Netherlands), Middle East (UAE, Saudi Arabia), Asia (Singapore, Malaysia, Philippines, Indonesia, Japan, South Korea), Africa (Nigeria, South Africa, Egypt), and Latin America (Brazil, Mexico, Argentina).
Also searched as: temperature unit converter, Celsius to Fahrenheit, Fahrenheit to Celsius, °C to °F, °F to °C, Kelvin to Celsius, Kelvin to Fahrenheit, temperature conversion calculator, weather temperature converter, cooking temperature converter.
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