Temperature Converter
Convert Celsius, Fahrenheit, and Kelvin temperatures.
This temperature converter switches between Celsius, Fahrenheit, and Kelvin, the three most commonly used temperature scales, each with a different zero point and degree size.
Enter a temperature in any of the three scales, and the calculator returns the equivalent in the other two.
Worked Calculation Examples
| Scenario | Result | Calculation Step |
|---|---|---|
| 37°C (body temperature) to Fahrenheit and Kelvin | 98.6°F, 310.15 K | F = 37 × 9/5 + 32 = 66.6 + 32 = 98.6°F. K = 37 + 273.15 = 310.15 K. |
| 98.6°F to Celsius | 37°C | C = (98.6 − 32) × 5/9 = 66.6 × 5/9 = 37°C. |
The Conversion Formulas
Fahrenheit = Celsius x 9/5 + 32. Celsius = (Fahrenheit - 32) x 5/9. Kelvin = Celsius + 273.15. Kelvin and Celsius share the same degree size (a 1-degree change is identical in both), differing only by their zero point, while Fahrenheit uses both a different zero point and a different degree size.
Why Kelvin Has No Negative Temperatures
Kelvin is an absolute temperature scale starting at absolute zero (0 K, equal to -273.15°C) - the theoretical point where molecular motion stops entirely - which is why Kelvin has no negative values, unlike Celsius and Fahrenheit, and is the standard scale used in scientific calculations like the ideal gas law.
How to Use the Temperature Converter
- Open the Temperature Converter and enter the values requested in the input fields.
- Check the units, percentages, dates, or time periods before reading the answer.
- Review the instant result and adjust any value to compare another scenario.
- Use the formula, example, and FAQs below to understand how the temperature converter works.
Frequently Asked Questions
How do you convert Celsius to Fahrenheit?
Multiply the Celsius temperature by 9/5, then add 32: Fahrenheit = (Celsius x 9/5) + 32.
How do you convert Celsius to Kelvin?
Add 273.15 to the Celsius temperature: Kelvin = Celsius + 273.15, since both scales share the same degree size but different zero points.
Why does Kelvin never go negative?
Kelvin is an absolute temperature scale that starts at absolute zero, the theoretical lowest possible temperature where molecular motion ceases - there's no temperature colder than 0 K, so negative Kelvin values don't exist.
How do I use this temperature converter?
Enter the known values, review the units or settings, and the calculator updates the result instantly. The formula and example on this page show how the answer is produced.
What does the Temperature Converter calculate?
Convert Celsius, Fahrenheit, and Kelvin temperatures. It is designed for fast browser-based calculations without sign-up, downloads, or manual spreadsheet setup.
What formula does this temperature use?
The formula is: F = C * 9/5 + 32. Daniel Gabriel Fahrenheit proposed his scale in 1724, reportedly anchoring 0°F to the coldest temperature he could reliably reproduce with a brine mixture; Anders Celsius introduced his scale in 1742, though it originally ran backward (0 for boiling, 100 for freezing) before being flipped to its modern orientation shortly after his death - Kelvin, defined later by William Thomson (Lord Kelvin) in 1848, anchored its scale to absolute zero, the true physical limit of cold.
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Last updated: September 27, 2026.