Temperature Converter

What Is the Temperature Converter?

The Temperature Converter is a free online tool that converts a temperature value between the three most common temperature scales: Fahrenheit (°F), used primarily in the United States; Celsius (°C), used almost everywhere else in the world; and Kelvin (K), the absolute scale used in science and engineering. Enter a value in any one of the three scales and instantly see the equivalent in the other two.

How to Use the Temperature Converter

1. Enter the temperature value you want to convert
2. Choose the unit your value is currently in (Fahrenheit, Celsius, or Kelvin)
3. Click "Convert Temperature" to see the equivalent value in all three scales simultaneously
4. Check the reference table below for common temperature benchmarks like water freezing/boiling points and body temperature

Temperature Conversion Formulas Used

The calculator uses these standard formulas, converting through Celsius as an intermediate step:

Worked Example

Suppose you want to convert normal human body temperature, 98.6°F, to Celsius and Kelvin. First: C = (98.6 − 32) × 5/9 = 66.6 × 5/9 = 37°C. Then: K = 37 + 273.15 = 310.15 K. This matches the commonly cited value for average human body temperature across all three scales.

Practical Notes

• Fahrenheit is used for everyday temperatures (weather, body temperature, thermostats) mainly in the United States.
• Celsius is the everyday scale used in the UK, Europe, and most of the world.
• Kelvin is used in physics, chemistry, and engineering because it's an absolute scale with no negative values above absolute zero.
• This is a general-purpose temperature converter. If you're specifically converting an oven temperature for a recipe (including UK gas mark settings), use our dedicated oven temperature converter instead — it's tuned for baking and cooking use cases.

Need a different kind of conversion? Try our length converter or weight converter next.