Contents

Introduction

The purpose of this page is to display luminosity contrast ratios for all web safe colours against a web safe background colour. The results are shown in a table that also includes the difference in brightness, and the difference in colour that are used by the colour contrast analyser for comparison. To test the luminosity contrast ratio for any colour combination, use the luminosity contrast ratio analyser.

The following icons are used in the results to indicate whether or not the result of a calculation is a pass.

Key for the Icons
Icon Meaning
Fail Indicates the value shown is a failure.
Pass Indicates the value shown is a pass.
Level AA Indicates that the luminosity contrast ratio is a level AA pass for large text (at least 18 point or 14 point bold)
Level AAA Indicates that the luminosity contrast ratio is a level AAA pass for large text (at least 18 point or 14 point bold)
Level AA Indicates that the luminosity contrast ratio is a level AA pass for regular text.
Level AAA Indicates that the luminosity contrast ratio is a level AAA pass for regular text.

Luminosity Contrast Ratios for #666

The following table shows the luminosity contrast ratios for all web safe colours with a background colour of #666, along with the difference in brightness and the difference in colour used by the colour contrast analyser for comparison.

Luminosity Ratios with background: #666
Foreground Colour Sample Luminosity Contrast Ratio Difference in Brightness Difference in Colour
#000 Sample Pass Level AA for large text3.66
Fail fo regular text
Fail 102 Fail 306
#003 Sample Pass Level AA for large text3.49
Fail fo regular text
Fail 96 Fail 255
#006 Sample Pass Level AA for large text3.07
Fail fo regular text
Fail 90 Fail 204
#009 Sample Fail2.51
Fail
Fail 84 Fail 255
#00c Sample Fail1.95
Fail
Fail 78 Fail 306
#00f Sample Fail1.50
Fail
Fail 72 Fail 357
#030 Sample Fail2.48
Fail
Fail 72 Fail 255
#033 Sample Fail2.40
Fail
Fail 66 Fail 204
#036 Sample Fail2.20
Fail
Fail 60 Fail 153
#039 Sample Fail1.89
Fail
Fail 54 Fail 204
#03c Sample Fail1.56
Fail
Fail 48 Fail 255
#03f Sample Fail1.25
Fail
Fail 42 Fail 306
#060 Sample Fail1.26
Fail
Fail 42 Fail 204
#063 Sample Fail1.24
Fail
Fail 36 Fail 153
#066 Sample Fail1.18
Fail
Fail 30 Fail 102
#069 Sample Fail1.09
Fail
Fail 24 Fail 153
#06c Sample Fail1.03
Fail
Fail 18 Fail 204
#06f Sample Fail1.19
Fail
Fail 13 Fail 255
#090 Sample Fail1.52
Fail
Fail 12 Fail 255
#093 Sample Fail1.53
Fail
Fail 6 Fail 204
#096 Sample Fail1.57
Fail
Fail 0 Fail 153
#099 Sample Fail1.65
Fail
Fail 5 Fail 204
#09c Sample Fail1.76
Fail
Fail 11 Fail 255
#09f Sample Fail1.91
Fail
Fail 16 Fail 306
#0c0 Sample Fail2.63
Fail
Fail 17 Fail 306
#0c3 Sample Fail2.65
Fail
Fail 23 Fail 255
#0c6 Sample Fail2.69
Fail
Fail 29 Fail 204
#0c9 Sample Fail2.76
Fail
Fail 35 Fail 255
#0cc Sample Fail2.87
Fail
Fail 41 Fail 306
#0cf Sample Pass Level AA for large text3.03
Fail fo regular text
Fail 46 Fail 357
#0f0 Sample Pass Level AA for large text4.18
Fail fo regular text
Fail 47 Fail 357
#0f3 Sample Pass Level AA for large text4.20
Fail fo regular text
Fail 53 Fail 306
#0f6 Sample Pass Level AA for large text4.24
Fail fo regular text
Fail 59 Fail 255
#0f9 Sample Pass Level AA for large text4.31
Fail fo regular text
Fail 65 Fail 306
#0fc Sample Pass Level AA for large text4.42
Fail fo regular text
Fail 70 Fail 357
#0ff Sample Pass Level AAA for large text4.58
Pass level 2 fo regular text
Fail 76 Fail 408
#300 Sample Pass Level AA for large text3.21
Fail fo regular text
Fail 86 Fail 255
#303 Sample Pass Level AA for large text3.08
Fail fo regular text
Fail 80 Fail 204
#306 Sample Fail2.74
Fail
Fail 75 Fail 153
#309 Sample Fail2.28
Fail
Fail 69 Fail 204
#30c Sample Fail1.82
Fail
Fail 63 Fail 255
#30f Sample Fail1.41
Fail
Fail 57 Fail 306
#330 Sample Fail2.27
Fail
Fail 56 Fail 204
#333 Sample Fail2.20
Fail
Fail 51 Fail 153
#336 Sample Fail2.02
Fail
Fail 45 Fail 102
#339 Sample Fail1.76
Fail
Fail 39 Fail 153
#33c Sample Fail1.47
Fail
Fail 33 Fail 204
#33f Sample Fail1.20
Fail
Fail 27 Fail 255
#360 Sample Fail1.20
Fail
Fail 26 Fail 153
#363 Sample Fail1.18
Fail
Fail 21 Fail 102
#366 Sample Fail1.13
Fail
Fail 15 Fail 51
#369 Sample Fail1.04
Fail
Fail 9 Fail 102
#36c Sample Fail1.07
Fail
Fail 3 Fail 153
#36f Sample Fail1.23
Fail
Fail 2 Fail 204
#390 Sample Fail1.56
Fail
Fail 3 Fail 204
#393 Sample Fail1.57
Fail
Fail 8 Fail 153
#396 Sample Fail1.61
Fail
Fail 14 Fail 102
#399 Sample Fail1.68
Fail
Fail 20 Fail 153
#39c Sample Fail1.80
Fail
Fail 26 Fail 204
#39f Sample Fail1.95
Fail
Fail 32 Fail 255
#3c0 Sample Fail2.67
Fail
Fail 32 Fail 255
#3c3 Sample Fail2.69
Fail
Fail 38 Fail 204
#3c6 Sample Fail2.73
Fail
Fail 44 Fail 153
#3c9 Sample Fail2.80
Fail
Fail 50 Fail 204
#3cc Sample Fail2.91
Fail
Fail 56 Fail 255
#3cf Sample Pass Level AA for large text3.07
Fail fo regular text
Fail 62 Fail 306
#3f0 Sample Pass Level AA for large text4.22
Fail fo regular text
Fail 62 Fail 306
#3f3 Sample Pass Level AA for large text4.24
Fail fo regular text
Fail 68 Fail 255
#3f6 Sample Pass Level AA for large text4.28
Fail fo regular text
Fail 74 Fail 204
#3f9 Sample Pass Level AA for large text4.35
Fail fo regular text
Fail 80 Fail 255
#3fc Sample Pass Level AA for large text4.46
Fail fo regular text
Fail 86 Fail 306
#3ff Sample Pass Level AAA for large text4.62
Pass level 2 fo regular text
Fail 92 Fail 357
#600 Sample Fail2.34
Fail
Fail 71 Fail 204
#603 Sample Fail2.27
Fail
Fail 65 Fail 153
#606 Sample Fail2.08
Fail
Fail 59 Fail 102
#609 Sample Fail1.81
Fail
Fail 54 Fail 153
#60c Sample Fail1.50
Fail
Fail 48 Fail 204
#60f Sample Fail1.22
Fail
Fail 42 Fail 255
#630 Sample Fail1.79
Fail
Fail 41 Fail 153
#633 Sample Fail1.75
Fail
Fail 35 Fail 102
#636 Sample Fail1.64
Fail
Fail 29 Fail 51
#639 Sample Fail1.46
Fail
Fail 24 Fail 102
#63c Sample Fail1.26
Fail
Fail 18 Fail 153
#63f Sample Fail1.05
Fail
Fail 12 Fail 204
#660 Sample Fail1.06
Fail
Fail 11 Fail 102
#663 Sample Fail1.04
Fail
Fail 5 Fail 51
#666 Sample Fail1.00
Fail
Fail 0 Fail 0
#669 Sample Fail1.07
Fail
Fail 5 Fail 51
#66c Sample Fail1.19
Fail
Fail 11 Fail 102
#66f Sample Fail1.34
Fail
Fail 17 Fail 153
#690 Sample Fail1.67
Fail
Fail 18 Fail 153
#693 Sample Fail1.69
Fail
Fail 24 Fail 102
#696 Sample Fail1.73
Fail
Fail 29 Fail 51
#699 Sample Fail1.80
Fail
Fail 35 Fail 102
#69c Sample Fail1.91
Fail
Fail 41 Fail 153
#69f Sample Fail2.07
Fail
Fail 47 Fail 204
#6c0 Sample Fail2.79
Fail
Fail 48 Fail 204
#6c3 Sample Fail2.80
Fail
Fail 54 Fail 153
#6c6 Sample Fail2.84
Fail
Fail 59 Fail 102
#6c9 Sample Fail2.92
Fail
Fail 65 Fail 153
#6cc Sample Pass Level AA for large text3.03
Fail fo regular text
Fail 71 Fail 204
#6cf Sample Pass Level AA for large text3.18
Fail fo regular text
Fail 77 Fail 255
#6f0 Sample Pass Level AA for large text4.34
Fail fo regular text
Fail 78 Fail 255
#6f3 Sample Pass Level AA for large text4.35
Fail fo regular text
Fail 83 Fail 204
#6f6 Sample Pass Level AA for large text4.39
Fail fo regular text
Fail 89 Fail 153
#6f9 Sample Pass Level AA for large text4.46
Fail fo regular text
Fail 95 Fail 204
#6fc Sample Pass Level AAA for large text4.58
Pass level 2 fo regular text
Fail 101 Fail 255
#6ff Sample Pass Level AAA for large text4.73
Pass level 2 fo regular text
Fail 107 Fail 306
#900 Sample Fail1.55
Fail
Fail 56 Fail 255
#903 Sample Fail1.52
Fail
Fail 50 Fail 204
#906 Sample Fail1.44
Fail
Fail 44 Fail 153
#909 Sample Fail1.30
Fail
Fail 38 Fail 204
#90c Sample Fail1.13
Fail
Fail 32 Fail 255
#90f Sample Fail1.04
Fail
Fail 27 Fail 306
#930 Sample Fail1.29
Fail
Fail 26 Fail 204
#933 Sample Fail1.27
Fail
Fail 20 Fail 153
#936 Sample Fail1.21
Fail
Fail 14 Fail 102
#939 Sample Fail1.11
Fail
Fail 8 Fail 153
#93c Sample Fail1.01
Fail
Fail 3 Fail 204
#93f Sample Fail1.17
Fail
Fail 2 Fail 255
#960 Sample Fail1.16
Fail
Fail 3 Fail 153
#963 Sample Fail1.18
Fail
Fail 9 Fail 102
#966 Sample Fail1.22
Fail
Fail 15 Fail 51
#969 Sample Fail1.29
Fail
Fail 21 Fail 102
#96c Sample Fail1.40
Fail
Fail 26 Fail 153
#96f Sample Fail1.56
Fail
Fail 32 Fail 204
#990 Sample Fail1.89
Fail
Fail 33 Fail 204
#993 Sample Fail1.90
Fail
Fail 39 Fail 153
#996 Sample Fail1.94
Fail
Fail 45 Fail 102
#999 Sample Fail2.02
Fail
Fail 51 Fail 153
#99c Sample Fail2.13
Fail
Fail 56 Fail 204
#99f Sample Fail2.28
Fail
Fail 62 Fail 255
#9c0 Sample Pass Level AA for large text3.01
Fail fo regular text
Fail 63 Fail 255
#9c3 Sample Pass Level AA for large text3.02
Fail fo regular text
Fail 69 Fail 204
#9c6 Sample Pass Level AA for large text3.06
Fail fo regular text
Fail 75 Fail 153
#9c9 Sample Pass Level AA for large text3.13
Fail fo regular text
Fail 80 Fail 204
#9cc Sample Pass Level AA for large text3.24
Fail fo regular text
Fail 86 Fail 255
#9cf Sample Pass Level AA for large text3.40
Fail fo regular text
Fail 92 Fail 306
#9f0 Sample Pass Level AAA for large text4.55
Pass level 2 fo regular text
Fail 93 Fail 306
#9f3 Sample Pass Level AAA for large text4.57
Pass level 2 fo regular text
Fail 99 Fail 255
#9f6 Sample Pass Level AAA for large text4.61
Pass level 2 fo regular text
Fail 105 Fail 204
#9f9 Sample Pass Level AAA for large text4.68
Pass level 2 fo regular text
Fail 110 Fail 255
#9fc Sample Pass Level AAA for large text4.79
Pass level 2 fo regular text
Fail 116 Fail 306
#9ff Sample Pass Level AAA for large text4.95
Pass level 2 fo regular text
Fail 122 Fail 357
#c00 Sample Fail1.03
Fail
Fail 41 Fail 306
#c03 Sample Fail1.01
Fail
Fail 35 Fail 255
#c06 Sample Fail1.03
Fail
Fail 29 Fail 204
#c09 Sample Fail1.10
Fail
Fail 23 Fail 255
#c0c Sample Fail1.21
Fail
Fail 17 Fail 306
#c0f Sample Fail1.37
Fail
Fail 11 Fail 357
#c30 Sample Fail1.10
Fail
Fail 11 Fail 255
#c33 Sample Fail1.12
Fail
Fail 5 Fail 204
#c36 Sample Fail1.16
Fail
Fail 0 Fail 153
#c39 Sample Fail1.23
Fail
Fail 6 Fail 204
#c3c Sample Fail1.34
Fail
Fail 12 Fail 255
#c3f Sample Fail1.50
Fail
Fail 18 Fail 306
#c60 Sample Fail1.50
Fail
Fail 18 Fail 204
#c63 Sample Fail1.51
Fail
Fail 24 Fail 153
#c66 Sample Fail1.55
Fail
Fail 30 Fail 102
#c69 Sample Fail1.62
Fail
Fail 36 Fail 153
#c6c Sample Fail1.73
Fail
Fail 42 Fail 204
#c6f Sample Fail1.89
Fail
Fail 47 Fail 255
#c90 Sample Fail2.22
Fail
Fail 48 Fail 255
#c93 Sample Fail2.23
Fail
Fail 54 Fail 204
#c96 Sample Fail2.27
Fail
Fail 60 Fail 153
#c99 Sample Fail2.35
Fail
Fail 66 Fail 204
#c9c Sample Fail2.46
Fail
Fail 72 Fail 255
#c9f Sample Fail2.62
Fail
Fail 77 Fail 306
#cc0 Sample Pass Level AA for large text3.34
Fail fo regular text
Fail 78 Fail 306
#cc3 Sample Pass Level AA for large text3.35
Fail fo regular text
Fail 84 Fail 255
#cc6 Sample Pass Level AA for large text3.39
Fail fo regular text
Fail 90 Fail 204
#cc9 Sample Pass Level AA for large text3.46
Fail fo regular text
Fail 96 Fail 255
#ccc Sample Pass Level AA for large text3.58
Fail fo regular text
Fail 102 Fail 306
#ccf Sample Pass Level AA for large text3.73
Fail fo regular text
Fail 107 Fail 357
#cf0 Sample Pass Level AAA for large text4.89
Pass level 2 fo regular text
Fail 108 Fail 357
#cf3 Sample Pass Level AAA for large text4.90
Pass level 2 fo regular text
Fail 114 Fail 306
#cf6 Sample Pass Level AAA for large text4.94
Pass level 2 fo regular text
Fail 120 Fail 255
#cf9 Sample Pass Level AAA for large text5.01
Pass level 2 fo regular text
Pass 126 Fail 306
#cfc Sample Pass Level AAA for large text5.12
Pass level 2 fo regular text
Pass 131 Fail 357
#cff Sample Pass Level AAA for large text5.28
Pass level 2 fo regular text
Pass 137 Fail 408
#f00 Sample Fail1.44
Fail
Fail 25 Fail 357
#f03 Sample Fail1.45
Fail
Fail 19 Fail 306
#f06 Sample Fail1.49
Fail
Fail 14 Fail 255
#f09 Sample Fail1.56
Fail
Fail 8 Fail 306
#f0c Sample Fail1.67
Fail
Fail 2 Fail 357
#f0f Sample Fail1.83
Fail
Fail 3 Fail 408
#f30 Sample Fail1.57
Fail
Fail 4 Fail 306
#f33 Sample Fail1.58
Fail
Fail 9 Fail 255
#f36 Sample Fail1.62
Fail
Fail 15 Fail 204
#f39 Sample Fail1.69
Fail
Fail 21 Fail 255
#f3c Sample Fail1.80
Fail
Fail 27 Fail 306
#f3f Sample Fail1.96
Fail
Fail 33 Fail 357
#f60 Sample Fail1.96
Fail
Fail 34 Fail 255
#f63 Sample Fail1.97
Fail
Fail 39 Fail 204
#f66 Sample Fail2.01
Fail
Fail 45 Fail 153
#f69 Sample Fail2.08
Fail
Fail 51 Fail 204
#f6c Sample Fail2.19
Fail
Fail 57 Fail 255
#f6f Sample Fail2.35
Fail
Fail 63 Fail 306
#f90 Sample Fail2.68
Fail
Fail 64 Fail 306
#f93 Sample Fail2.69
Fail
Fail 69 Fail 255
#f96 Sample Fail2.73
Fail
Fail 75 Fail 204
#f99 Sample Fail2.81
Fail
Fail 81 Fail 255
#f9c Sample Fail2.92
Fail
Fail 87 Fail 306
#f9f Sample Pass Level AA for large text3.08
Fail fo regular text
Fail 93 Fail 357
#fc0 Sample Pass Level AA for large text3.80
Fail fo regular text
Fail 93 Fail 357
#fc3 Sample Pass Level AA for large text3.81
Fail fo regular text
Fail 99 Fail 306
#fc6 Sample Pass Level AA for large text3.85
Fail fo regular text
Fail 105 Fail 255
#fc9 Sample Pass Level AA for large text3.92
Fail fo regular text
Fail 111 Fail 306
#fcc Sample Pass Level AA for large text4.04
Fail fo regular text
Fail 117 Fail 357
#fcf Sample Pass Level AA for large text4.19
Fail fo regular text
Fail 123 Fail 408
#ff0 Sample Pass Level AAA for large text5.35
Pass level 2 fo regular text
Fail 123 Fail 408
#ff3 Sample Pass Level AAA for large text5.36
Pass level 2 fo regular text
Pass 129 Fail 357
#ff6 Sample Pass Level AAA for large text5.40
Pass level 2 fo regular text
Pass 135 Fail 306
#ff9 Sample Pass Level AAA for large text5.47
Pass level 2 fo regular text
Pass 141 Fail 357
#ffc Sample Pass Level AAA for large text5.59
Pass level 2 fo regular text
Pass 147 Fail 408
#fff Sample Pass Level AAA for large text5.74
Pass level 2 fo regular text
Pass 153 Fail 459

Other Background Colour Combinations

Examine luminosity contrast ratios with other web safe backround colours.