Temperature Converter: Convert Between Celsius, Fahrenheit, and Kelvin

The Three Temperature Scales

Celsius (°C) sets 0 as the freezing point of water and 100 as the boiling point at sea level. It is the most widely used scale worldwide and is part of the SI (International System of Units).

Fahrenheit (°F) sets 32 as the freezing point and 212 as the boiling point of water. It remains the primary scale in the United States for everyday weather and cooking.

Kelvin (K) starts at absolute zero — the theoretical minimum temperature where all thermal motion stops. It uses the same degree size as Celsius but offset by 273.15. Zero Kelvin equals -273.15°C. Kelvin has no negative values and is used in scientific and engineering calculations.

• 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

How to Use This Tool

Type a temperature value in any of the three fields. The other two update instantly.

1. 1

   Enter a temperature

   Type a numeric value into the Celsius, Fahrenheit, or Kelvin input field.

2. 2

   See all conversions

   The other two temperature fields update in real time.

3. 3

   Use negative values

   Negative values are fully supported for Celsius and Fahrenheit (Kelvin cannot go below 0).

4. 4

   Copy a result

   Click the copy icon next to any field to copy that temperature to your clipboard.

5. 5

   Clear and try another

   Delete the value to reset all fields and enter a new temperature.

Common Use Cases

Temperature conversion comes up across many domains.

• Cooking and recipes: converting baking temperatures between US (°F) and international (°C) recipes
• Weather apps: displaying temperatures for users in different countries
• Scientific calculations: converting sensor output to Kelvin for thermodynamic equations
• Hardware monitoring: converting CPU or GPU temperatures between units
• Medical contexts: body temperature reference points (37°C = 98.6°F)
• Climate data: working with international weather datasets

Tips and Best Practices

Quick mental shortcuts for common conversions.

• Quick Celsius to Fahrenheit estimate: double the °C value and add 30 (exact: × 1.8 + 32)
• Quick Fahrenheit to Celsius estimate: subtract 30 and halve (exact: subtract 32 then × 5/9)
• Body temperature: 37°C = 98.6°F — a useful anchor point
• Absolute zero: 0 K = -273.15°C = -459.67°F
• Room temperature: approximately 20-22°C = 68-72°F = 293-295 K

Frequently Asked Questions