Temperature Converter
Convert temperature between Celsius, Fahrenheit, and Kelvin instantly. Enter one value and see all units at once.
About This Free Online Temperature Converter
Our free online temperature converter instantly converts between Celsius (°C), Fahrenheit (°F), and Kelvin (K). Type a value, pick the unit you are starting from, and every other unit updates live. Unlike simple from/to converters, this tool shows all temperature scales at once so you never have to convert twice. It handles negative temperatures, decimals, and absolute zero correctly using the exact conversion formulas. Everything runs in your browser — your data never leaves your device.
Features of Our Temperature Converter
- Convert between Celsius, Fahrenheit, and Kelvin
- See all temperature units update at once
- Handles negative temperatures and decimals
- Exact formula-based conversion (no rounding errors)
- Live results as you type
- 100% private — browser-only processing
How to Use the Temperature Converter
Using this tool is simple and requires no signup or registration. Follow these steps:
- Enter a temperature value in the input field.
- Select the unit you are converting from (°C, °F, or K).
- Read the converted values in every other unit instantly below.
- Click Copy to copy the full conversion summary.
Frequently Asked Questions About Temperature Converter
How do I convert Celsius to Fahrenheit?
Multiply the Celsius value by 9/5 and add 32. For example, 100°C × 9/5 + 32 = 212°F. This tool does it automatically — just type the Celsius value and read the Fahrenheit result.
How do I convert Fahrenheit to Celsius?
Subtract 32 from the Fahrenheit value, then multiply by 5/9. For example, (212°F − 32) × 5/9 = 100°C. The converter handles this instantly.
What is Kelvin and how does it relate to Celsius?
Kelvin is the SI base unit of temperature, starting at absolute zero. To convert Celsius to Kelvin, add 273.15. So 0°C equals 273.15 K, and absolute zero is −273.15°C or 0 K.
Is my data sent to a server?
No. All temperature conversions happen entirely in your browser using JavaScript. Nothing is uploaded, logged, or stored.
Why Choose Text Toolbox?
Text Toolbox provides free, private, and instant online text tools. Unlike other text utility websites that require signup accounts or send your data to servers, all our tools process your text entirely in your browser. This means your content never leaves your device — we cannot see it, store it, or share it. Our tools are fast, lightweight, and work on any device with a modern web browser.