Converters

Temperature Converter

Convert Celsius, Fahrenheit, and Kelvin instantly. Essential for cooking, science, and travel.

Use Temperature Converter to get instant results without uploads or sign-ups. Everything runs securely in your browser for fast, reliable output.

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About this tool

The world uses two main temperature scales: Celsius (used almost everywhere) and Fahrenheit (used in the US). Science uses Kelvin and engineering often uses Rankine.

This converter helps you switch between them instantly. Perfect for checking the weather before a trip, baking with a foreign recipe, chemistry homework, or engineering calculations.

Usage examples

Water Freezing

0°C

0°C = 32°F = 273.15K

Body Temp

98.6°F

98.6°F = 37°C

How to use

  1. Enter the temperature value.
  2. Select the unit you are converting FROM.
  3. The tool instantly shows the equivalent in other units.

Benefits

  • Simultaneous conversion (shows all units)
  • High precision
  • Supports negative values

FAQs

What is absolute zero?

Absolute zero is the lowest possible temperature where all molecular motion theoretically ceases. It equals 0 Kelvin (-273.15°C, -459.67°F, 0°R). At this point, atoms have minimal quantum motion and no thermal energy can be extracted. It's impossible to reach absolute zero, though scientists have gotten within a billionth of a degree.

How do I convert Celsius to Fahrenheit?

Multiply by 9/5 (or 1.8) and add 32. For example, 20°C × 1.8 + 32 = 68°F. Use this tool for instant conversions.

Why does the US use Fahrenheit?

The US adopted Fahrenheit before the metric system became widespread. Fahrenheit offers more precise whole-number readings for everyday temperatures (0-100°F covers most weather conditions).

What is the Kelvin scale used for?

Kelvin is the SI unit for temperature used in science and engineering. It starts at absolute zero (no negative values) making it ideal for thermodynamic calculations.

What temperature is water freezing and boiling?

Water freezes at 0°C (32°F, 273.15K) and boils at 100°C (212°F, 373.15K) at standard atmospheric pressure. These fixed points were used to define the Celsius scale.

Can I convert negative temperatures?

Yes, this tool handles negative temperatures correctly. Celsius and Fahrenheit can be negative, but Kelvin cannot (absolute zero is 0K). Negative temperatures are common in winter weather and scientific applications.

What is the Rankine scale?

Rankine (°R) is an absolute temperature scale used primarily in engineering, especially in the United States. Like Kelvin, it starts at absolute zero, but uses Fahrenheit-sized degrees. 0°R = absolute zero, and water freezes at 491.67°R.

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