I often find myself converting between different formats of color codes; especially from hex to RGB and back again. Rather than firing up Google and searching for color conversion tools online, I decided to write my own User Defined Functions in Excel, now I can calculate the result within a worksheet instead.

The functions in this post include the conversions for RGB, hex, HSL, CMYK and long formats.

Using these color conversion functions, I created an add-in which makes the conversion even easier. Keep reading to find out how you can download the add-in for free.

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Contents

## Excel’s different color code formats

Even in Excel, there are four different methods of defining color; RGB, hex, HSL and long.

### RGB

The RGB (Red, Green and Blue) color code is used within the standard color dialog box.

The individual colors Red, Green and Blue each have 256 different shades, which when mixed can create 16,777,216 different color combinations.

### HSL

Within the standard color dialog box there is another code format; using the **color model** drop-down we can change to HSL. HSL uses **H**ue, **S**aturation and **L**uminance to create the color.

HSL tries to define colors closer to the way humans think about colors.

- Hue – is the degree on the color wheel from 0 to 360. 0 is red, 120 is green, 240 is blue.
- Saturation – is a percentage of the amount of color included. 100% is full color, 0% is no color (i.e. all grey)
- Luminance (or lightness) – is a percentage of grey. 0% is black, 100% is white.

Frustratingly, Excel does not handle HSL in the standard way. Instead, Excel measures all the numbers where 0 is the lowest and 255 is the biggest. But, it’s a quirk we can handle.

### Long

The long color code is used by VBA when displaying the color property of an item. The following macro displays the long code for the fill of the active cell.

Sub ActiveCellColor() MsgBox "Long color code: " & ActiveCell.Interior.Color End Sub

Select a cell and run the macro.

The long code is a number from 0 to 16,777,215, where each separate number represents a color. The relationship between RGB and long is based on a simple calculation:

**Long = Red x 256 x 256 + Blue x 256 + Green**

As an example:

- Where Red: 33, Green: 115 and Blue: 70
- The result calculates as 33 x 256 x 256 + 115 x 256 + 33 = 4,616,993

Long and RGB are related; they are just different ways of calculating the same number.

### Hex

Hex color codes are similar to RGB as they also use 256 shades for each individual color. The critical difference is that the hex system represents the numbers from 0 to 255 using just two characters. This is possible because hex uses Base-16.

We generally use Base-10 in everyday life, which means that we have 10 digits (0, 1, 2, 3, 4, 5, 6, 7, 8, 9) available. As an example, the number 14 is created by using the formula (1 x base) + 4. The base is 10, so the result is calculated as (1 x 10) + 4, which equals 14.

For Base-16, there are 16 digits; however, as we don’t have enough number characters we use A, B, C, D, E and F to represent the numbers from 10 through 15.

As an example, the hex number AB equals 171.

- A = 10
- B = 11.
- The calculation is (A x base) + B = (10 x 16) + 11 = 171

In hex, the lowest value is zero and the highest value is F (which is equal to 15). Therefore, there are 16 possible individual digits. This means that from two digits we can create 256 shades (16 x 16 = 256), which is the same as RGB. Therefore, hex also has the same 16,777,216 combinations as RGB and long.

Hex codes are presented in reverse order to RGB, so if the hex color code is #**467321 **the last two characters represent red, the middle two characters represent green and the first two are blue.

Using the #467321 hex code as an example, the conversion to RGB would be:

- Red: Hex value of 21 calculates as (2 * 16) + 1 = 33
- Green: Hex value of 73 calculates as (7 * 16) + 3 = 115
- Blue: Hex value of 46 calculates as (4 * 16) + 6 = 70

The hex codes are used within the VBA properties to define color.

The color code in the screenshot above is: **&H00467321&**

- & = Start character
- H = Hex code
- 00 = Tells VBA to use a custom color
- 467321 = the Hex color code
- & = End character

### CMYK

Another common color code system is CMYK. It is used primarily for printing, as it determines the amount of **C**yan, **M**agenta, **Y**ellow and blac**K** ink used in overlapping printed dots.

While Excel does not use CMYK, it is a common method, so I have included it within the scope of this post.

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## User Defined Functions for color conversion

In the section above, I’ve tried to explain how each method defines colors, but converting between them is a different matter entirely, and is much harder. Thankfully, we can let Excel do the work for us. Below are the UDF’s to convert between the various methods.

Remember! – To use VBA functions, the code must be included in a standard VBA code module.

RGB, hex and long are all based on whole numbers, so they should perfectly convert between each other. CMYK and HSL involve decimal places and percentages and therefore could create small differences in their conversions.

### Convert from RGB to hex

The following UDF calculates the hex value based on the RGB color codes.

Function GetHexFromRGB(Red As Integer, Green As Integer, Blue As Integer) As String GetHexFromRGB = "#" & VBA.Right$("00" & VBA.Hex(Blue), 2) & _ VBA.Right$("00" & VBA.Hex(Green), 2) & VBA.Right$("00" & VBA.Hex(Red), 2) End Function

**How to use the function:**

The function contains 3 arguments, values between 0 and 255 for each individual Red, Green, or Blue value.

### Convert from hex to RGB

The UDF below provides the Red, Green, or Blue value based on the hex color.

Function GetRGBFromHex(hexColor As String, RGB As String) As String hexColor = VBA.Replace(hexColor, "#", "") hexColor = VBA.Right$("000000" & hexColor, 6) Select Case RGB Case "R" GetRGBFromHex = VBA.Val("&H" & VBA.Mid(hexColor, 5, 2)) Case "G" GetRGBFromHex = VBA.Val("&H" & VBA.Mid(hexColor, 3, 2)) Case "B" GetRGBFromHex = VBA.Val("&H" & VBA.Mid(hexColor, 1, 2)) End Select End Function

**How to use the function:**

The function contains 2 arguments;

- the hex code
- the letter R, G or B, to represent the color to be returned

### Convert from RGB to long

This UDF provides the long value based on the RGB color codes.

Function GetLongFromRGB(Red As Integer, Green As Integer, Blue As Integer) As Long GetLongFromRGB = RGB(Red, Green, Blue) End Function

**How to use the function:**

The function contains 3 arguments, values between 0 and 255 for each individual Red, Green, or Blue value.

### Convert from long to RGB

To convert from RGB to the long color code, use the following UDF.

Function GetRGBFromLong(longColor As Long, RGB As String) As Integer Select Case RGB Case "R" GetRGBFromLong = (longColor Mod 256) Case "G" GetRGBFromLong = (longColor \ 256) Mod 256 Case "B" GetRGBFromLong = (longColor \ 65536) Mod 256 End Select End Function

**How to use the function:**

The function contains 2 arguments;

- the long code
- the letter R, G, or B, depending on which color we want to return.

### Convert from long to hex

The following UDF provides the hex code based on the long color code.

Function GetHexFromLong(longCode As Long) As String GetHexFromLong = "#" & Application.WorksheetFunction.Dec2Hex(longCode) End Function

**How to use the function:**

The function has only one argument, which is the long color code.

### Convert from hex to long

The UDF below converts the hex code into the long color code.

Function GetLongFromHex(hexColor As String) As Long hexColor = VBA.Replace(hexColor, "#", "") hexColor = VBA.Right$("000000" & hexColor, 6) GetLongFromHex = Application.WorksheetFunction.Hex2Dec(hexColor) End Function

**How to use the function:**

The function has only one argument, which is the hex code.

### Convert from RGB to HSL

The UDF below will return the degree of Hue, % of Saturation, or % of Luminance based on the RGB color codes.

Function GetHSLFromRGB(Red As Integer, Green As Integer, Blue As Integer, _ HSL As String) Dim RedPct As Double Dim GreenPct As Double Dim BluePct As Double Dim MinRGB As Double Dim MaxRGB As Double Dim H As Double Dim S As Double Dim L As Double RedPct = Red / 255 GreenPct = Green / 255 BluePct = Blue / 255 MinRGB = Application.WorksheetFunction.Min(RedPct, GreenPct, BluePct) MaxRGB = Application.WorksheetFunction.Max(RedPct, GreenPct, BluePct) L = (MinRGB + MaxRGB) / 2 If MinRGB = MaxRGB Then S = 0 ElseIf L < 0.5 Then S = (MaxRGB - MinRGB) / (MaxRGB + MinRGB) Else S = (MaxRGB - MinRGB) / (2 - MaxRGB - MinRGB) End If If S = 0 Then H = 0 ElseIf RedPct > Application.WorksheetFunction.Max(GreenPct, BluePct) Then H = (GreenPct - BluePct) / (MaxRGB - MinRGB) ElseIf GreenPct > Application.WorksheetFunction.Max(RedPct, BluePct) Then H = 2 + (BluePct - RedPct) / (MaxRGB - MinRGB) Else H = 4 + (RedPct - GreenPct) / (MaxRGB - MinRGB) End If H = H * 60 If H < 0 Then H = H + 360 Select Case HSL Case "H" GetHSLFromRGB = H Case "S" GetHSLFromRGB = S Case "L" GetHSLFromRGB = L End Select End Function

**How to use the function:**

The function contains 4 arguments. The R, G and B values, then the letter H, S, or L, depending on the value to be returned by the function.

The calculation for converting to HSL is based on the calculation from here: http://www.niwa.nu/2013/05/math-behind-colorspace-conversions-rgb-hsl/

### Convert from HSL to RGB

The following UDF calculates the RGB values based on the degree of Hue, a% of Saturation % of Luminance

Function GetRGBFromHSL(Hue As Double, Saturation As Double, Luminance As Double, _ RGB As String) Dim R As Double Dim G As Double Dim B As Double Dim temp1 As Double Dim temp2 As Double Dim tempR As Double Dim tempG As Double Dim tempB As Double If Saturation = 0 Then R = Luminance * 255 G = Luminance * 255 B = Luminance * 255 GoTo ReturnValue End If If Luminance < 0.5 Then temp1 = Luminance * (1 + Saturation) Else temp1 = Luminance + Saturation - Luminance * Saturation End If temp2 = 2 * Luminance - temp1 Hue = Hue / 360 tempR = Hue + 0.333 tempG = Hue tempB = Hue - 0.333 If tempR < 0 Then tempR = tempR + 1 If tempR > 1 Then tempR = tempR - 1 If tempG < 0 Then tempG = tempG + 1 If tempG > 1 Then tempG = tempG - 1 If tempB < 0 Then tempB = tempB + 1 If tempB > 1 Then tempB = tempB - 1 If 6 * tempR < 1 Then R = temp2 + (temp1 - temp2) * 6 * tempR Else If 2 * tempR < 1 Then R = temp1 Else If 3 * tempR < 2 Then R = temp2 + (temp1 - temp2) * (0.666 - tempR) * 6 Else R = temp2 End If End If End If If 6 * tempG < 1 Then G = temp2 + (temp1 - temp2) * 6 * tempG Else If 2 * tempG < 1 Then G = temp1 Else If 3 * tempG < 2 Then G = temp2 + (temp1 - temp2) * (0.666 - tempG) * 6 Else G = temp2 End If End If End If If 6 * tempB < 1 Then B = temp2 + (temp1 - temp2) * 6 * tempB Else If 2 * tempB < 1 Then B = temp1 Else If 3 * tempB < 2 Then B = temp2 + (temp1 - temp2) * (0.666 - tempB) * 6 Else B = temp2 End If End If End If R = R * 255 G = G * 255 B = B * 255 ReturnValue: Select Case RGB Case "R" GetRGBFromHSL = Round(R, 0) Case "G" GetRGBFromHSL = Round(G, 0) Case "B" GetRGBFromHSL = Round(B, 0) End Select End Function

**How to use the function:**

The function contains 4 arguments. The Hue degree, Saturation %, and Luminance %, plus the letter R, G or B depending on the value to be returned

The calculation for converting from HSL is based on the calculation from here: http://www.niwa.nu/2013/05/math-behind-colorspace-conversions-rgb-hsl/

### Convert from RGB to CMYK

The following UDF provides the % value for Cyan, Magenta, Yellow, or Black based on the RGB color codes.

Function GetCMYKFromRGB(Red As Integer, Green As Integer, Blue As Integer, _ CMYK As String) As Double Dim K As Double Dim RedPct As Double Dim GreenPct As Double Dim BluePct As Double Dim MaxRGB As Double RedPct = Red / 255 GreenPct = Green / 255 BluePct = Blue / 255 MaxRGB = Application.WorksheetFunction.Max(RedPct, GreenPct, BluePct) If MaxRGB = 0 And CMYK <> "K" Then GetCMYKFromRGB = 0 Exit Function End If K = 1 - MaxRGB Select Case CMYK Case "C" GetCMYKFromRGB = (1 - RedPct - K) / (1 - K) Case "M" GetCMYKFromRGB = (1 - GreenPct - K) / (1 - K) Case "Y" GetCMYKFromRGB = (1 - BluePct - K) / (1 - K) Case "K" GetCMYKFromRGB = K End Select End Function

**How to use the function:**

The function requires 4 arguments. The R, G and B values, along with the letter C, M, Y or K, depending on the value to be returned.

The calculation for converting to CMYK is based on the calculation from here: https://www.easycalculation.com/colorconverter/cmyk-rgb-color-convertor.php

### Convert from CMYK to RGB

To get the C, M, Y, or K percentages from RGB use the UDF below.

Function GetRGBFromCMYK(C As Double, M As Double, Y As Double, K As Double, _ RGB As String) As Integer Select Case RGB Case "R" GetRGBFromCMYK = 255 * (1 - K) * (1 - C) Case "G" GetRGBFromCMYK = 255 * (1 - K) * (1 - M) Case "B" GetRGBFromCMYK = 255 * (1 - K) * (1 - Y) End Select End Function

**How to use the function:**

The function requires 5 arguments. The Cyan, Magenta, Yellow and Black percentages, plus the letter R, G or B, depending on the value to be returned.

The calculation for converting from CMYK is based on the calculation from here: https://stackoverflow.com/questions/10690125/coloring-cells-in-excel-with-cmyk-cell-values

## Color conversion add-in

Using these conversion functions, I have created an Excel add-in that will quickly switch between the different color codes.

Get the add-in for free from the downloads section. To install the add-in, follow the PDF instructions included in the download, or follow the instructions in this post.

Once installed, the EOTG menu will include an icon called Converter in the Color Codes group.

Click the button to open the tool. When entering values into any of the boxes, the other boxes will automatically display the converted codes.

## Conclusion

I hope this post provides you with all the color conversions that you need. If you want to convert between two methods that I have not covered above (for example, hex to HSL has not been included), convert from the source code to RGB, then from RGB to the target mode.

Now that you can convert between color codes, you should check out the following posts, which will help you along your Excel journey.

**Don’t forget:**

If you’ve found this post useful, or if you have a better approach, then please leave a comment below.

**Do you need help adapting this to your needs?**

I’m guessing the examples in this post didn’t exactly meet your situation. We all use Excel differently, so it’s impossible to write a post that will meet everybody’s needs. By taking the time to understand the techniques and principles in this post (and elsewhere on this site) you should be able to adapt it to your needs.

But, if you’re still struggling you should:

- Read other blogs, or watch YouTube videos on the same topic. You will benefit much more by discovering your own solutions.
- Ask the ‘Excel Ninja’ in your office. It’s amazing what things other people know.
- Ask a question in a forum like Mr Excel, or the Microsoft Answers Community. Remember, the people on these forums are generally giving their time for free. So take care to craft your question, make sure it’s clear and concise. List all the things you’ve tried, and provide screenshots, code segments and example workbooks.
- Use Excel Rescue, who are my consultancy partner. They help by providing solutions to smaller Excel problems.