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Temperature Converter

Convert between Celsius, Fahrenheit, and Kelvin instantly. See all three temperature scales side by side with formulas and a common temperature reference table.

Enter a temperature value, select your scale, and see conversions to all three temperature units simultaneously.

Conversions

100
°C
212
°F
373.15
K

Formulas Used

•°F = °C × 9/5 + 32
•K = °C + 273.15

Common Temperature Reference

Description°C°FK
Absolute Zero−273.15−459.670
Water Freezes032273.15
Room Temperature20–2268–72293–295
Human Body3798.6310.15
Water Boils100212373.15

How to Use This Tool

  1. Enter the temperature value you want to convert.
  2. Select the scale your value is in — Celsius, Fahrenheit, or Kelvin.
  3. View the converted value in all three scales simultaneously.
  4. Check the "Formulas Used" section to see exactly which equations were applied.
  5. Browse the Common Temperature Reference table for familiar benchmarks like body temperature or water's freezing/boiling points.

Formula & How It Works

Celsius to Fahrenheit Formula

°F = °C × 9/5 + 32

Multiply the Celsius value by 1.8 and add 32 to get the equivalent Fahrenheit temperature.

Fahrenheit to Celsius Formula

°C = (°F − 32) × 5/9

Subtract 32 from the Fahrenheit value, then multiply by 5/9 to get the equivalent Celsius temperature.

Celsius to Kelvin Formula

K = °C + 273.15

Kelvin uses the same degree size as Celsius but is offset so that 0 K equals absolute zero, which is −273.15°C.

Practical Examples & Common Use Cases

Converting a hot summer day from Celsius to Fahrenheit

30°C × 9/5 + 32 = 54 + 32 = 86°F.

Converting a US oven temperature from Fahrenheit to Celsius

(350°F − 32) × 5/9 = 318 × 5/9 ≈ 176.7°C, a common baking temperature.

Converting room temperature from Celsius to Kelvin

21°C + 273.15 = 294.15 K.

Frequently Asked Questions

Multiply the Celsius value by 9/5 (or 1.8) and add 32. For a rough estimate, double the Celsius value and add 30. For example, 25°C ≈ (25 × 2) + 30 = 80°F (exact: 77°F).

Absolute zero is 0 Kelvin (−273.15°C or −459.67°F). It is the theoretical lowest possible temperature, where particles have minimal kinetic energy. It has never been fully reached in a laboratory.

The Fahrenheit scale was developed by Daniel Gabriel Fahrenheit in 1724 and was widely adopted in English-speaking countries. While most nations switched to Celsius with metrication, the US retained Fahrenheit for everyday use due to custom and the cost of conversion.

Celsius and Fahrenheit are equal at −40 degrees. Setting °C = °F in the formula °F = °C × 9/5 + 32 gives °C = °C × 9/5 + 32, which solves to °C = −40.

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