What this tool does
Convert a temperature reading between Celsius, Fahrenheit and kelvin. The calculation first converts the entered reading to kelvin: Celsius + 273.15, or (Fahrenheit + 459.67) × 5/9. Celsius is K − 273.15 and Fahrenheit is Celsius × 9/5 + 32. Converted fields display two decimal places. These are temperature readings with offsets, not temperature differences.
How to use Temperature Converter
- Prepare the input. Enter a value in the correctly labelled temperature field.
- Run or configure the tool. Read the automatically updated other scales.
- Check and use the output. Check the physical range and avoid converting a temperature difference as a reading.
How this tool works
The calculation first converts the entered reading to kelvin: Celsius + 273.15, or (Fahrenheit + 459.67) × 5/9. Celsius is K − 273.15 and Fahrenheit is Celsius × 9/5 + 32. Converted fields display two decimal places. These are temperature readings with offsets, not temperature differences.
Worked example
Input: Celsius 0
Output: Fahrenheit 32.00; kelvin 273.15.
Limits, assumptions and interpretation
Kelvin is written K without a degree sign.
- Inputs must be finite and at or above absolute zero: −273.15 °C, −459.67 °F or 0 K. Values below those limits are rejected.
- A temperature interval needs different rules: a 1 °C change is a 1 K change, not 274.15 K.
- The rounded output is not instrument calibration or a statement of measurement accuracy.
Supported inputs and limits
- Celsius 0
- Kelvin is written K without a degree sign.
- Inputs must be finite and at or above absolute zero: −273.15 °C, −459.67 °F or 0 K. Values below those limits are rejected.
- A temperature interval needs different rules: a 1 °C change is a 1 K change, not 274.15 K.
- The rounded output is not instrument calibration or a statement of measurement accuracy.
Sources and specifications
Frequently asked questions
What does this tool actually do?
The calculation first converts the entered reading to kelvin: Celsius + 273.15, or (Fahrenheit + 459.67) × 5/9. Celsius is K − 273.15 and Fahrenheit is Celsius × 9/5 + 32. Converted fields display two decimal places. These are temperature readings with offsets, not temperature differences.
What should I check before using the result?
Kelvin is written K without a degree sign. Inputs must be finite and at or above absolute zero: −273.15 °C, −459.67 °F or 0 K. Values below those limits are rejected. A temperature interval needs different rules: a 1 °C change is a 1 K change, not 274.15 K. The rounded output is not instrument calibration or a statement of measurement accuracy.
Is information sent to a server?
Tool inputs are processed in this browser. This product does not use analytics or send your input to an external API. Clicking an external website link still visits that website.