Temperature Converter

What is the Temperature Converter?

The Temperature Converter switches between Celsius, Fahrenheit, and Kelvin instantly. It sounds like a minor tool, but the conversion formulas are just fiddly enough that people get them wrong regularly — especially the Fahrenheit-to-Celsius direction. Travelers, scientists, students, and anyone following a foreign recipe or reading a weather forecast from another country all end up needing this at some point. CalciHub's version converts all three scales at once, so you see the equivalent in every unit on one screen.

How Does It Work?

Unlike most conversions, temperature doesn't use a simple multiplication — each scale has a different zero point, so there's an offset in the formula.

Celsius to Fahrenheit: °F = (°C × 9/5) + 32

Fahrenheit to Celsius: °C = (°F − 32) × 5/9

Celsius to Kelvin: K = °C + 273.15

Kelvin to Celsius: °C = K − 273.15

°C = degrees Celsius

°F = degrees Fahrenheit

K = Kelvin (no degree symbol — it's just "Kelvin")

15 = the offset between Celsius and absolute zero

How to Use CalciHub's Temperature Converter

1. Enter a temperature value in any of the three fields (Celsius, Fahrenheit, or Kelvin).

2. The other two fields update automatically.

3. No need to choose a direction — just type in whichever unit you have.

Tip: Kelvin values below 0 are physically impossible (absolute zero is 0 K). If you enter a negative Kelvin value, the calculator will flag it as invalid.

A Quick Example

A student is converting an oven temperature from a US recipe. The recipe calls for 375°F, but the oven dial is in Celsius.

Input: 375°F

Results:

Celsius: 190.56°C

Kelvin: 463.71 K

The closest standard oven setting is 190°C, which is close enough. Without the calculator, this conversion is the kind of thing people usually Google three times before trusting the result.

Frequently Asked Questions