Need to convert a temperature from Celsius, Fahrenheit, or Kelvin? Our free Temperature Converter makes it quick and easy. Enter a temperature, choose the unit you are converting from and the unit you want, and get the converted result instantly. It is useful for checking weather temperatures, schoolwork, science, cooking, travel, and everyday temperature conversions.
How to Use the Temperature Converter
The Temperature Converter is simple to use. Enter a temperature, select the units, and click Convert.
- Enter the temperature in the input box.
- Select the original unit under From.
- Select the unit you want under To.
- Click Convert.
- The converted temperature will appear in the result box.
For example, enter 25, select Celsius (°C) as the From unit and Fahrenheit (°F) as the To unit.
The result will be:
25 °C = 77 °F
You can also enter negative temperatures and decimal values such as -10, 36.5, or 98.6.
What Is Temperature Conversion?
Temperature conversion means changing a temperature from one scale to another while representing the same temperature.
The three temperature scales supported by this converter are:
- Celsius
- Fahrenheit
- Kelvin
For example:
0 °C = 32 °F = 273.15 K
The temperature is the same, but the number used to describe it changes depending on the scale.
What Is Celsius?
Celsius, written as °C, is one of the most commonly used temperature scales around the world.
On the Celsius scale:
- Water freezes at 0 °C
- Water boils at 100 °C under standard atmospheric pressure
- Normal room temperatures are generally measured in degrees Celsius
Celsius is commonly used for weather forecasts, cooking, science, and everyday temperature measurements.
What Is Fahrenheit?
Fahrenheit, written as °F, is a temperature scale commonly used in the United States.
On the Fahrenheit scale:
- Water freezes at 32 °F
- Water boils at 212 °F under standard atmospheric pressure
For example:
25 °C = 77 °F
and:
100 °C = 212 °F
What Is Kelvin?
Kelvin, written as K, is an absolute temperature scale commonly used in science.
Unlike Celsius and Fahrenheit, Kelvin does not use a degree symbol.
The Kelvin scale starts at absolute zero:
0 K = -273.15 °C
Kelvin is commonly used in physics, chemistry, engineering, and scientific calculations.
Celsius to Fahrenheit
To convert Celsius to Fahrenheit, use this formula:
°F = (°C × 9/5) + 32
For example:
25 °C
becomes:
(25 × 9/5) + 32 = 77 °F
Therefore:
25 °C = 77 °F
Fahrenheit to Celsius
To convert Fahrenheit to Celsius, use:
°C = (°F − 32) × 5/9
For example:
68 °F
becomes:
(68 − 32) × 5/9 = 20 °C
Therefore:
68 °F = 20 °C
Celsius to Kelvin
To convert Celsius to Kelvin:
K = °C + 273.15
For example:
25 °C + 273.15 = 298.15 K
Therefore:
25 °C = 298.15 K
Kelvin to Celsius
To convert Kelvin to Celsius:
°C = K − 273.15
For example:
300 K − 273.15 = 26.85 °C
Therefore:
300 K = 26.85 °C
Fahrenheit to Kelvin
To convert Fahrenheit to Kelvin:
K = (°F − 32) × 5/9 + 273.15
For example:
32 °F = 273.15 K
This conversion is useful when moving between everyday Fahrenheit measurements and scientific temperature values.
Kelvin to Fahrenheit
To convert Kelvin to Fahrenheit:
°F = (K − 273.15) × 9/5 + 32
For example:
273.15 K = 32 °F
The converter performs this calculation automatically.
Common Temperature Conversions
Here are some useful temperature conversions:
| Celsius | Fahrenheit | Kelvin |
|---|---|---|
| -40 °C | -40 °F | 233.15 K |
| 0 °C | 32 °F | 273.15 K |
| 10 °C | 50 °F | 283.15 K |
| 20 °C | 68 °F | 293.15 K |
| 25 °C | 77 °F | 298.15 K |
| 30 °C | 86 °F | 303.15 K |
| 37 °C | 98.6 °F | 310.15 K |
| 100 °C | 212 °F | 373.15 K |
These values can be useful when checking temperature conversions manually.
Why Are There Different Temperature Scales?
Different temperature scales were developed for different purposes and at different points in history.
Today, Celsius is widely used for everyday temperature measurements, Fahrenheit remains common in the United States, and Kelvin is widely used for scientific work.
A temperature converter makes it easier to move between these scales without doing the calculations manually.
What Is Absolute Zero?
Absolute zero is the lowest theoretical temperature.
It is:
0 K
which is equal to:
-273.15 °C
or:
-459.67 °F
Temperatures below absolute zero are not supported by the converter.
Temperature Conversion in Everyday Life
Temperature conversion can be useful in many everyday situations.
You may need it when:
- Checking weather information from another country
- Following an international recipe
- Comparing temperature readings
- Studying science
- Working on school assignments
- Traveling
- Reading technical information
- Converting scientific measurements
For example, someone familiar with Celsius may see a weather forecast of 86 °F and want to know the equivalent Celsius temperature.
The answer is:
86 °F = 30 °C
Temperature Conversion in Cooking
Recipes sometimes use different temperature scales depending on where they were written.
For example, an oven temperature may be given in Celsius in one recipe and Fahrenheit in another.
Some common oven temperature conversions include:
- 160 °C = 320 °F
- 180 °C = 356 °F
- 200 °C = 392 °F
- 220 °C = 428 °F
Always follow the temperature and cooking instructions provided by the specific recipe or appliance.
Celsius vs Fahrenheit
Celsius and Fahrenheit use different numerical scales.
For example:
0 °C = 32 °F
while:
100 °C = 212 °F
Interestingly, the two scales meet at:
-40 °C = -40 °F
This is the temperature at which both scales have the same numerical value.
Why Use an Online Temperature Converter?
Temperature formulas are not difficult, but converting between three different scales manually can be inconvenient.
An online converter lets you enter the temperature, choose the two scales, and get the result immediately.
It can be useful for quick checks, homework, travel, cooking, and everyday temperature comparisons.
Frequently Asked Questions
What temperature scales does this converter support?
It supports Celsius (°C), Fahrenheit (°F), and Kelvin (K).
What is 0 °C in Fahrenheit?
0 °C = 32 °F.
What is 100 °C in Fahrenheit?
100 °C = 212 °F.
What is 25 °C in Fahrenheit?
25 °C = 77 °F.
What is 20 °C in Fahrenheit?
20 °C = 68 °F.
What is 37 °C in Fahrenheit?
37 °C = 98.6 °F.
What is 32 °F in Celsius?
32 °F = 0 °C.
What is 68 °F in Celsius?
68 °F = 20 °C.
What is 100 °C in Kelvin?
100 °C = 373.15 K.
What is 0 Kelvin in Celsius?
0 K = -273.15 °C.
Can I enter negative temperatures?
Yes. You can enter negative temperatures such as -10 °C or -40 °F.
Can I enter decimal temperatures?
Yes. The converter accepts decimal values such as 36.5 °C, 98.6 °F, and 273.15 K.
Can Kelvin be negative?
No. The Kelvin scale starts at 0 K, which represents absolute zero. The converter will not accept a Kelvin value below 0.
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