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Temperature Converter

Convert temperature measurements seamlessly between Celsius (°C), Fahrenheit (°F), and Kelvin (K) with instant live conversion and physical absolute zero boundary protection.

How to Use the Temperature Converter

Enter the temperature value, pick your original unit, and view immediate conversions into all other scales. Use the swap button to invert the conversion instantly.

Formula & Calculation Method

°F = (°C × 9/5) + 32 | °C = (°F - 32) × 5/9 | K = °C + 273.15

Celsius and Kelvin share identical scale increments offset by 273.15. Fahrenheit increments are 5/9 the size of Celsius degrees and offset by 32.

Calculation Examples

Freezing Point of Water

Input:0 °C

Result:32 °F = 273.15 K

Pure water freezes at standard atmospheric pressure.

Boiling Point of Water

Input:100 °C

Result:212 °F = 373.15 K

Pure water boils at standard sea-level pressure.

Room Temperature

Input:68 °F

Result:20 °C = 293.15 K

Standard room ambient temperature.

Frequently Asked Questions

What is absolute zero?

Absolute zero is the lowest theoretical temperature, where all molecular motion ceases: 0 Kelvin, -273.15 °C, or -459.67 °F. Temperatures below this value are physically impossible.

At what temperature are Celsius and Fahrenheit equal?

Celsius and Fahrenheit are exactly equal at -40° (-40 °C = -40 °F).

Can Kelvin be negative?

No. The Kelvin scale starts at absolute zero (0 K); therefore, negative Kelvin values do not exist in classical thermodynamics.