Temperature Converter
Convert between Celsius, Fahrenheit and Kelvin online free — instant temperature conversion for any value, no signup required.
Last updated: 10 October 2026
Convert between Celsius, Fahrenheit and Kelvin instantly. Verified: 100°C = 212°F = 373.15K; 32°F = 0°C = 273.15K; and absolute zero 0K = -273.15°C = -459.67°F.
Temperature Converter
Enter a value in any field; the other two update automatically.
Quick Reference
Worked Examples
Verified points
- 100°C → 212°F, 373.15K (water's boiling point at sea level)
- 32°F → 0°C, 273.15K (water's freezing point)
- 0K → -273.15°C, -459.67°F (absolute zero)
Quick mental math
- Celsius to Fahrenheit: double it, add 30 — close enough for weather.
- Fahrenheit to Celsius: subtract 30, halve.
- Scientific work uses Kelvin: no negatives, directly proportional to kinetic energy.
Video Guide
About Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin temperature scales. Enter a value in any scale and see the conversion in all three scales instantly. We tested by converting 100°C (result: 212°F, 373.15K), 32°F (result: 0°C, 273.15K), and 0K (result: -273.15°C, -459.67°F) — all matched standard formulas.
Limits: Does not support Rankine or Réaumur temperature scales; No historical temperature reference points beyond the quick table; Kelvin values are shown to two decimal places — scientific applications may need more precision
Who Uses This Tool
- A US home cook converting a recipe from 180°C to 356°F for their oven
- A scientist converting a lab measurement from 310.15K to 37°C for a medical journal submission
- A traveler checking that a 28°C forecast in Barcelona translates to a comfortable 82°F
Key Features
- Celsius, Fahrenheit, Kelvin
- Bidirectional conversion
- Quick reference table
- All three scales shown simultaneously
How to use Temperature Converter
- Enter a temperature value.
- Select the input scale (C, F, or K).
- See conversions in all three scales.
How It Compares
Unlike Google's temperature converter which requires a search query each time, this tool stays open for repeated conversions without reloading. It also displays all three scales at once — most converters only show the two you're converting between.
Privacy & Security
Because processing happens directly in your browser, your files and input are not uploaded to our servers.
Written and checked by Mohammad Sohail
Conversion points re-checked on 10 October 2026 against standard formulas.
About FreeDigitalToolkit →Frequently Asked Questions
When would I use Kelvin?
Kelvin is used in scientific contexts, especially in physics and chemistry. Absolute zero is 0K.
How do I convert Fahrenheit to Celsius?
Use the formula: (F - 32) × 5/9. Or simply enter the Fahrenheit value in this tool and see the Celsius equivalent instantly.
What is absolute zero?
Absolute zero is 0 Kelvin (-273.15°C / -459.67°F), the theoretical lowest possible temperature where all molecular motion stops.
Why are there three temperature scales?
Celsius is metric standard for everyday use, Fahrenheit is used in the US for weather and cooking, and Kelvin is the scientific absolute scale starting from absolute zero.
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