Temperature Converter
Convert temperatures between Fahrenheit, Celsius and Kelvin.
Enter a temperature, choose the starting unit and the unit you want to convert to.
Conversion Result
Enter a temperature above to convert between units.
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About the Creator
MyCruncher — Founded by Bobby Dues
MyCruncher provides free online calculators designed to make everyday calculations easier to understand and use.
Meet Bobby Dues →Free Temperature Converter – Convert Fahrenheit, Celsius and Kelvin
Need to convert Fahrenheit to Celsius, Celsius to Fahrenheit, or temperatures into Kelvin? The free MyCruncher Temperature Converter helps you convert between three common temperature scales.
Whether you’re checking weather temperatures, following cooking instructions, studying science, or comparing international measurements, this calculator makes temperature conversions easier.
Enter your temperature, choose your starting unit, select the unit you want to convert to, and calculate.
The converter displays the converted result along with equivalent values in Fahrenheit, Celsius and Kelvin.
How to Use the Temperature Converter
The MyCruncher Temperature Converter uses a simple four-step process.
- Enter the temperature. Type the numerical temperature you want to convert.
- Select the From unit. Choose Fahrenheit, Celsius or Kelvin.
- Select the To unit. Choose the temperature scale you want to convert into.
- Click Convert Temperature. Review the converted temperature and additional scale values.
- Use Swap Units. Reverse the conversion direction for another calculation.
You can enter positive and negative temperatures where physically valid.
Kelvin values cannot be negative.
What Is the Difference Between Fahrenheit, Celsius and Kelvin?
Fahrenheit, Celsius and Kelvin measure temperature, but they use different numerical scales.
Fahrenheit (°F)
Fahrenheit is commonly used for everyday temperature reporting in the United States.
At standard atmospheric pressure, water freezes at approximately 32°F and boils at approximately 212°F.
Celsius (°C)
Celsius is widely used for weather, cooking and scientific measurements.
Water freezes at approximately 0°C and boils at approximately 100°C at standard pressure.
Kelvin (K)
Kelvin is the SI base unit of thermodynamic temperature.
The Kelvin scale begins at absolute zero, which is 0 K.
Kelvin temperatures are written without a degree symbol.
How to Convert Fahrenheit to Celsius
To convert Fahrenheit into Celsius, subtract 32, multiply by five, and divide by nine.
Fahrenheit to Celsius Example
Example: Suppose the outside temperature is 68°F.
Step 1: Subtract 32
Step 2: Multiply by Five
Step 3: Divide by Nine
This is an exact temperature conversion.
Fahrenheit to Celsius Conversion Chart
| Fahrenheit | Celsius |
|---|---|
| -40°F | -40°C |
| 0°F | -17.78°C |
| 32°F | 0°C |
| 50°F | 10°C |
| 68°F | 20°C |
| 77°F | 25°C |
| 86°F | 30°C |
| 98.6°F | 37°C |
| 100°F | 37.78°C |
| 212°F | 100°C |
Where needed, results are rounded to two decimal places.
How to Convert Celsius to Fahrenheit
To convert Celsius into Fahrenheit, multiply by nine, divide by five, then add 32.
Celsius to Fahrenheit Example
Example: Suppose the temperature is 30°C.
Step 1: Multiply by Nine
Step 2: Divide by Five
Step 3: Add 32
Celsius to Fahrenheit Conversion Chart
| Celsius | Fahrenheit |
|---|---|
| -40°C | -40°F |
| -20°C | -4°F |
| -10°C | 14°F |
| 0°C | 32°F |
| 10°C | 50°F |
| 20°C | 68°F |
| 25°C | 77°F |
| 30°C | 86°F |
| 40°C | 104°F |
| 100°C | 212°F |
How to Convert Celsius to Kelvin
The Celsius and Kelvin scales use equal-sized temperature intervals.
Their zero points differ by exactly 273.15.
Celsius to Kelvin Example
Suppose the temperature is 25°C.
How to Convert Kelvin to Celsius
Subtract 273.15 from the Kelvin value.
Kelvin to Celsius Example
Suppose the temperature is 300 K.
How to Convert Fahrenheit to Kelvin
First convert Fahrenheit into Celsius, then add 273.15.
Fahrenheit to Kelvin Example
Suppose the temperature is 68°F.
How to Convert Kelvin to Fahrenheit
Convert Kelvin to Celsius, then convert the Celsius result to Fahrenheit.
Kelvin to Fahrenheit Example
Suppose the temperature is 300 K.
Fahrenheit, Celsius and Kelvin Comparison Chart
The following table compares temperatures across all three scales.
| Fahrenheit | Celsius | Kelvin |
|---|---|---|
| -459.67°F | -273.15°C | 0 K |
| -40°F | -40°C | 233.15 K |
| 0°F | -17.78°C | 255.37 K |
| 32°F | 0°C | 273.15 K |
| 50°F | 10°C | 283.15 K |
| 68°F | 20°C | 293.15 K |
| 77°F | 25°C | 298.15 K |
| 86°F | 30°C | 303.15 K |
| 100°F | 37.78°C | 310.93 K |
| 212°F | 100°C | 373.15 K |
Water’s freezing and boiling temperatures shown in this guide refer to approximately standard atmospheric pressure. Actual phase-change temperatures depend on pressure and other conditions.
What Is Absolute Zero?
Absolute zero is the zero point of the Kelvin thermodynamic temperature scale.
It corresponds to exactly 0 K, -273.15°C, and -459.67°F.
Kelvin is an absolute temperature scale, so ordinary thermodynamic temperatures do not extend below 0 K.
At What Temperature Do Fahrenheit and Celsius Match?
Fahrenheit and Celsius have the same numerical value at -40 degrees.
This is a useful reference when comparing the two scales.
What Temperature Does Water Freeze At?
At standard atmospheric pressure, pure water normally freezes at approximately:
Water can freeze at different temperatures when dissolved substances or pressure conditions change.
What Temperature Does Water Boil At?
At standard atmospheric pressure, pure water normally boils at approximately:
At higher elevations, lower atmospheric pressure generally reduces the boiling temperature.
How to Convert Cooking Temperatures
Recipes may list oven temperatures in Fahrenheit or Celsius.
When using a recipe from another country, temperature conversion can help identify the oven setting.
Oven Temperature Conversion Chart
| Fahrenheit | Celsius |
|---|---|
| 250°F | 121.1°C |
| 275°F | 135°C |
| 300°F | 148.9°C |
| 325°F | 162.8°C |
| 350°F | 176.7°C |
| 375°F | 190.6°C |
| 400°F | 204.4°C |
| 425°F | 218.3°C |
| 450°F | 232.2°C |
Home ovens often use rounded temperature settings. Follow the appliance instructions and recipe guidance.
Temperature Conversion for Weather
Weather forecasts commonly use Fahrenheit in the United States and Celsius in many other countries.
A temperature of 86°F is equivalent to 30°C.
Temperature conversion can help when planning travel or interpreting international forecasts.
Temperature Conversion for Science
Scientific calculations frequently use Kelvin because it is an absolute temperature scale.
Kelvin is important in thermodynamics, chemistry, physics, and engineering.
When a scientific formula requires absolute temperature, use Kelvin rather than substituting Celsius.
Temperature Conversion vs. Temperature Change
A temperature reading and a temperature difference are not converted in exactly the same way.
For absolute temperature readings, Fahrenheit and Celsius conversions include an offset of 32.
For temperature differences, the offset is not applied.
For example, a temperature increase of 10°C corresponds to an increase of 18°F.
This does not mean that a temperature reading of 10°C equals 18°F.
Common Temperature Conversion Mistakes
- Forgetting the 32-degree offset. Absolute Fahrenheit and Celsius readings require both multiplication and an offset.
- Confusing Celsius and Kelvin. Their intervals are equal-sized, but their zero points differ.
- Using a degree symbol with Kelvin. Write 300 K, not 300°K.
- Confusing a temperature with a temperature difference. These require different handling of the offset.
- Rounding too early. Keep sufficient precision until the final result.
- Entering physically invalid Kelvin values. Kelvin values cannot be negative for ordinary thermodynamic temperatures.
- Assuming water always boils at 100°C. Boiling temperature depends on atmospheric pressure.
Frequently Asked Questions
How do I convert Fahrenheit to Celsius?
Subtract 32 from the Fahrenheit value, multiply by five, and divide by nine.
How do I convert Celsius to Fahrenheit?
Multiply Celsius by nine, divide by five, then add 32.
What is 32°F in Celsius?
32 degrees Fahrenheit equals 0 degrees Celsius.
What is 68°F in Celsius?
68 degrees Fahrenheit equals 20 degrees Celsius.
What is 100°F in Celsius?
100°F is approximately 37.78°C.
What is 100°C in Fahrenheit?
100°C equals 212°F.
What is 0°C in Fahrenheit?
0°C equals 32°F.
What is 25°C in Fahrenheit?
25°C equals 77°F.
What is 30°C in Fahrenheit?
30°C equals 86°F.
How do I convert Celsius to Kelvin?
Add 273.15 to the Celsius temperature.
How do I convert Kelvin to Celsius?
Subtract 273.15 from the Kelvin value.
What is 0°C in Kelvin?
0°C equals 273.15 K.
What is 25°C in Kelvin?
25°C equals 298.15 K.
What is 300 K in Celsius?
300 K equals 26.85°C.
What is 300 K in Fahrenheit?
300 K equals approximately 80.33°F.
What is absolute zero?
Absolute zero is 0 K, equivalent to -273.15°C and -459.67°F.
When do Fahrenheit and Celsius have the same value?
They are numerically equal at -40 degrees.
What temperature does water freeze at?
Pure water normally freezes at approximately 32°F or 0°C at standard atmospheric pressure.
What temperature does water boil at?
Pure water normally boils at approximately 212°F or 100°C at standard atmospheric pressure.
Can I convert negative temperatures?
Yes. Negative Fahrenheit and Celsius values can be converted as long as the resulting absolute temperature is physically valid.
Can Kelvin be negative?
Ordinary thermodynamic temperatures cannot be below 0 K.
Does the calculator show all three temperature scales?
Yes. The results display Fahrenheit, Celsius, and Kelvin equivalents.
Can I swap the temperature units?
Yes. Use the Swap Units button to reverse the conversion direction.
Is the MyCruncher Temperature Converter free?
Yes! The MyCruncher Temperature Converter is free to use for everyday temperature conversions.
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Important: This guide provides educational temperature conversion formulas and reference examples. Displayed results may be rounded. Phase-change temperatures depend on pressure, purity and other conditions. For safety-critical, medical, laboratory or engineering work, verify required measurement accuracy and applicable technical standards.