Temperature Conversion Calculator to Convert Celsius, Fahrenheit, and Kelvin

Temperature Conversion Calculator Sign

This calculator will convert Celsius to Fahrenheit, Fahrenheit to Kelvin, Kelvin to Celsius, as well as the reverse of all three conversions.

Plus, unlike other online temperature converters, this one will show the formula and step-by-step math it used to complete the conversion.

Finally, the calculator also provides a feature that will allow you to create your own custom, printable, temperature conversion chart. Just select the scale you are converting from and to, enter the desired starting and ending temperatures, and click the button. Cool!

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Temperature Conversion Calculator

Convert Celsius, Fahrenheit, and Kelvin and see which conversion formula was used and the steps taken to solve it.

Special Instructions

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Selected Data Record:

A Data Record is a set of calculator entries that are stored in your web browser's Local Storage. If a Data Record is currently selected in the "Data" tab, this line will list the name you gave to that data record. If no data record is selected, or you have no entries stored for this calculator, the line will display "None".

DataData recordData recordSelected data record: None

Conversion type:

Tap the desired conversion option. The temperature conversion calculator will then rename the fields according to your selection. Note that Celsius is also referred to as Centigrade, so Centigrade to Fahrenheit conversion is the same as Celsius to Fahrenheit.

Celsius : temp:temperature: temperature:


Enter the temperature units/degrees to convert from the type listed on in this line.

Fahrenheit : temp:equivalent: equivalent:

Conversion result:

This is the temperature converted to the type listed on this line.

If you would like to save the current entries to the secure online database, tap or click on the Data tab, select "New Data Record", give the data record a name, then tap or click the Save button. To save changes to previously saved entries, simply tap the Save button. Please select and "Clear" any data records you no longer need.

Conversion Chart

Conversion chart:

To create a custom temperature conversion chart that you can print out, enter the starting and ending temperature of the type you are converting from (selection at top of calculator). Then click the Create Conversion Chart button.

Start:Starting temp:Starting temperature:Temperature to begin chart at:

Starting temperature:

Enter the temperature you want the chart to start at.

End:Ending temp:Ending temperature:Temperature to end chart at:

Ending temperature:

Enter the temperature you want the chart to stop at.


Help and Tools


How to convert temperatures from one type to another.

Temperature Conversion Formula By Type

Each of the following examples lists the temperature conversion formula for the corresponding type, plus solves for the unknown variable.

Celsius or Centigrade to Fahrenheit Conversion

C = 15° , F = ?
C to F Formula:F=C x 9/5 + 32
 F=15 x 1.8 + 32
 F=27 + 32
Fahrenheit to Celsius Conversion

50° F = ?° C
F to C Formula:C=(F - 32) x (5/9)
 C=(50 - 32) x (5/9)
 C=18 x .56
Celsius to Kelvin Conversion

10° C = ? Kelvin
C to K Formula:K=C + 273.15
 K=10 + 273.15
Kelvin to Celsius Conversion

325 Kelvin = ?° C
K to C Formula:C=K - 273.15
 C=325 - 273.15
Fahrenheit to Kelvin Conversion

50° F = ? Kelvin
F to K Formula:K=(F + 459.67) x (5/9)
 K=(50 + 459.67) x (5/9)
 K=509.67 x .56
Kelvin to Fahrenheit Conversion

260 Kelvin = ?° F
K to F Formula:F=(K x 9/5) - 459.67
 F=(260 x 1.8) - 459.67
 F=468 - 459.67

Celsius, Fahrenheit, and Kelvin Scale Comparison

The following chart compares the three most common benchmarks for each temperature scale:

Benchmark° Fahrenheit° CelsiusKelvin
Freezing Point:320273
Avg. Room Temp:6820293
Boiling Point:212100373

I hope I've explained the conversion process well enough for you to follow the steps. If not, please let me know in the feedback form located beneath the calculator.

Adjust Calculator Width:

Move the slider to left and right to adjust the calculator width. Note that the Help and Tools panel will be hidden when the calculator is too wide to fit both on the screen. Moving the slider to the left will bring the instructions and tools panel back into view.

Also note that some calculators will reformat to accommodate the screen size as you make the calculator wider or narrower. If the calculator is narrow, columns of entry rows will be converted to a vertical entry form, whereas a wider calculator will display columns of entry rows, and the entry fields will be smaller in size ... since they will not need to be "thumb friendly".

Show/Hide Popup Keypads:

Select Show or Hide to show or hide the popup keypad icons located next to numeric entry fields. These are generally only needed for mobile devices that don't have decimal points in their numeric keypads. So if you are on a desktop, you may find the calculator to be more user-friendly and less cluttered without them.

Stick/Unstick Tools:

Select Stick or Unstick to stick or unstick the help and tools panel. Selecting "Stick" will keep the panel in view while scrolling the calculator vertically. If you find that annoying, select "Unstick" to keep the panel in a stationary position.

If the tools panel becomes "Unstuck" on its own, try clicking "Unstick" and then "Stick" to re-stick the panel.