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 #c00

The following table shows the luminosity contrast ratios for all web safe colours with a background colour of #c00, along with the difference in brightness and the difference in colour used by the colour contrast analyser for comparison.

Luminosity Ratios with background: #c00
Foreground Colour Sample Luminosity Contrast Ratio Difference in Brightness Difference in Colour
#000 Sample Pass Level AA for large text3.57
Fail fo regular text
Fail 60 Fail 204
#003 Sample Pass Level AA for large text3.40
Fail fo regular text
Fail 55 Fail 255
#006 Sample Fail2.99
Fail
Fail 49 Fail 306
#009 Sample Fail2.44
Fail
Fail 43 Fail 357
#00c Sample Fail1.91
Fail
Fail 37 Fail 408
#00f Sample Fail1.46
Fail
Fail 31 Fail 459
#030 Sample Fail2.42
Fail
Fail 31 Fail 255
#033 Sample Fail2.34
Fail
Fail 25 Fail 306
#036 Sample Fail2.14
Fail
Fail 19 Fail 357
#039 Sample Fail1.85
Fail
Fail 13 Fail 408
#03c Sample Fail1.52
Fail
Fail 7 Fail 459
#03f Sample Fail1.22
Fail
Fail 1 Pass 510
#060 Sample Fail1.23
Fail
Fail 1 Fail 306
#063 Sample Fail1.21
Fail
Fail 4 Fail 357
#066 Sample Fail1.15
Fail
Fail 10 Fail 408
#069 Sample Fail1.06
Fail
Fail 16 Fail 459
#06c Sample Fail1.06
Fail
Fail 22 Pass 510
#06f Sample Fail1.22
Fail
Fail 27 Pass 561
#090 Sample Fail1.56
Fail
Fail 28 Fail 357
#093 Sample Fail1.57
Fail
Fail 34 Fail 408
#096 Sample Fail1.61
Fail
Fail 40 Fail 459
#099 Sample Fail1.69
Fail
Fail 46 Pass 510
#09c Sample Fail1.80
Fail
Fail 52 Pass 561
#09f Sample Fail1.96
Fail
Fail 57 Pass 612
#0c0 Sample Fail2.70
Fail
Fail 58 Fail 408
#0c3 Sample Fail2.71
Fail
Fail 64 Fail 459
#0c6 Sample Fail2.76
Fail
Fail 70 Pass 510
#0c9 Sample Fail2.83
Fail
Fail 76 Pass 561
#0cc Sample Fail2.95
Fail
Fail 82 Pass 612
#0cf Sample Pass Level AA for large text3.11
Fail fo regular text
Fail 87 Pass 663
#0f0 Sample Pass Level AA for large text4.29
Fail fo regular text
Fail 88 Fail 459
#0f3 Sample Pass Level AA for large text4.30
Fail fo regular text
Fail 94 Pass 510
#0f6 Sample Pass Level AA for large text4.34
Fail fo regular text
Fail 100 Pass 561
#0f9 Sample Pass Level AA for large text4.42
Fail fo regular text
Fail 106 Pass 612
#0fc Sample Pass Level AAA for large text4.53
Pass level 2 fo regular text
Fail 111 Pass 663
#0ff Sample Pass Level AAA for large text4.69
Pass level 2 fo regular text
Fail 117 Pass 714
#300 Sample Pass Level AA for large text3.13
Fail fo regular text
Fail 45 Fail 153
#303 Sample Pass Level AA for large text3.00
Fail fo regular text
Fail 39 Fail 204
#306 Sample Fail2.68
Fail
Fail 34 Fail 255
#309 Sample Fail2.23
Fail
Fail 28 Fail 306
#30c Sample Fail1.77
Fail
Fail 22 Fail 357
#30f Sample Fail1.38
Fail
Fail 16 Fail 408
#330 Sample Fail2.21
Fail
Fail 15 Fail 204
#333 Sample Fail2.15
Fail
Fail 9 Fail 255
#336 Sample Fail1.98
Fail
Fail 4 Fail 306
#339 Sample Fail1.72
Fail
Fail 1 Fail 357
#33c Sample Fail1.43
Fail
Fail 7 Fail 408
#33f Sample Fail1.17
Fail
Fail 13 Fail 459
#360 Sample Fail1.17
Fail
Fail 14 Fail 255
#363 Sample Fail1.15
Fail
Fail 19 Fail 306
#366 Sample Fail1.10
Fail
Fail 25 Fail 357
#369 Sample Fail1.02
Fail
Fail 31 Fail 408
#36c Sample Fail1.10
Fail
Fail 37 Fail 459
#36f Sample Fail1.26
Fail
Fail 43 Pass 510
#390 Sample Fail1.60
Fail
Fail 44 Fail 306
#393 Sample Fail1.61
Fail
Fail 49 Fail 357
#396 Sample Fail1.65
Fail
Fail 55 Fail 408
#399 Sample Fail1.73
Fail
Fail 61 Fail 459
#39c Sample Fail1.84
Fail
Fail 67 Pass 510
#39f Sample Fail2.00
Fail
Fail 73 Pass 561
#3c0 Sample Fail2.74
Fail
Fail 74 Fail 357
#3c3 Sample Fail2.75
Fail
Fail 79 Fail 408
#3c6 Sample Fail2.79
Fail
Fail 85 Fail 459
#3c9 Sample Fail2.87
Fail
Fail 91 Pass 510
#3cc Sample Fail2.99
Fail
Fail 97 Pass 561
#3cf Sample Pass Level AA for large text3.15
Fail fo regular text
Fail 103 Pass 612
#3f0 Sample Pass Level AA for large text4.33
Fail fo regular text
Fail 103 Fail 408
#3f3 Sample Pass Level AA for large text4.34
Fail fo regular text
Fail 109 Fail 459
#3f6 Sample Pass Level AA for large text4.38
Fail fo regular text
Fail 115 Pass 510
#3f9 Sample Pass Level AA for large text4.46
Fail fo regular text
Fail 121 Pass 561
#3fc Sample Pass Level AAA for large text4.57
Pass level 2 fo regular text
Pass 127 Pass 612
#3ff Sample Pass Level AAA for large text4.73
Pass level 2 fo regular text
Pass 133 Pass 663
#600 Sample Fail2.28
Fail
Fail 30 Fail 102
#603 Sample Fail2.21
Fail
Fail 24 Fail 153
#606 Sample Fail2.03
Fail
Fail 18 Fail 204
#609 Sample Fail1.76
Fail
Fail 13 Fail 255
#60c Sample Fail1.46
Fail
Fail 7 Fail 306
#60f Sample Fail1.19
Fail
Fail 1 Fail 357
#630 Sample Fail1.75
Fail
Fail 0 Fail 153
#633 Sample Fail1.71
Fail
Fail 5 Fail 204
#636 Sample Fail1.60
Fail
Fail 11 Fail 255
#639 Sample Fail1.43
Fail
Fail 16 Fail 306
#63c Sample Fail1.23
Fail
Fail 22 Fail 357
#63f Sample Fail1.02
Fail
Fail 28 Fail 408
#660 Sample Fail1.03
Fail
Fail 29 Fail 204
#663 Sample Fail1.02
Fail
Fail 35 Fail 255
#666 Sample Fail1.03
Fail
Fail 41 Fail 306
#669 Sample Fail1.10
Fail
Fail 46 Fail 357
#66c Sample Fail1.22
Fail
Fail 52 Fail 408
#66f Sample Fail1.38
Fail
Fail 58 Fail 459
#690 Sample Fail1.72
Fail
Fail 59 Fail 255
#693 Sample Fail1.73
Fail
Fail 65 Fail 306
#696 Sample Fail1.77
Fail
Fail 70 Fail 357
#699 Sample Fail1.84
Fail
Fail 76 Fail 408
#69c Sample Fail1.96
Fail
Fail 82 Fail 459
#69f Sample Fail2.12
Fail
Fail 88 Pass 510
#6c0 Sample Fail2.86
Fail
Fail 89 Fail 306
#6c3 Sample Fail2.87
Fail
Fail 95 Fail 357
#6c6 Sample Fail2.91
Fail
Fail 100 Fail 408
#6c9 Sample Fail2.99
Fail
Fail 106 Fail 459
#6cc Sample Pass Level AA for large text3.10
Fail fo regular text
Fail 112 Pass 510
#6cf Sample Pass Level AA for large text3.26
Fail fo regular text
Fail 118 Pass 561
#6f0 Sample Pass Level AA for large text4.45
Fail fo regular text
Fail 119 Fail 357
#6f3 Sample Pass Level AA for large text4.46
Fail fo regular text
Fail 125 Fail 408
#6f6 Sample Pass Level AAA for large text4.50
Pass level 2 fo regular text
Pass 130 Fail 459
#6f9 Sample Pass Level AAA for large text4.58
Pass level 2 fo regular text
Pass 136 Pass 510
#6fc Sample Pass Level AAA for large text4.69
Pass level 2 fo regular text
Pass 142 Pass 561
#6ff Sample Pass Level AAA for large text4.85
Pass level 2 fo regular text
Pass 148 Pass 612
#900 Sample Fail1.52
Fail
Fail 15 Fail 51
#903 Sample Fail1.49
Fail
Fail 9 Fail 102
#906 Sample Fail1.40
Fail
Fail 3 Fail 153
#909 Sample Fail1.27
Fail
Fail 2 Fail 204
#90c Sample Fail1.11
Fail
Fail 8 Fail 255
#90f Sample Fail1.06
Fail
Fail 13 Fail 306
#930 Sample Fail1.26
Fail
Fail 14 Fail 102
#933 Sample Fail1.24
Fail
Fail 20 Fail 153
#936 Sample Fail1.18
Fail
Fail 26 Fail 204
#939 Sample Fail1.09
Fail
Fail 32 Fail 255
#93c Sample Fail1.04
Fail
Fail 37 Fail 306
#93f Sample Fail1.20
Fail
Fail 43 Fail 357
#960 Sample Fail1.19
Fail
Fail 44 Fail 153
#963 Sample Fail1.21
Fail
Fail 50 Fail 204
#966 Sample Fail1.25
Fail
Fail 56 Fail 255
#969 Sample Fail1.32
Fail
Fail 62 Fail 306
#96c Sample Fail1.44
Fail
Fail 67 Fail 357
#96f Sample Fail1.60
Fail
Fail 73 Fail 408
#990 Sample Fail1.94
Fail
Fail 74 Fail 204
#993 Sample Fail1.95
Fail
Fail 80 Fail 255
#996 Sample Fail1.99
Fail
Fail 86 Fail 306
#999 Sample Fail2.07
Fail
Fail 92 Fail 357
#99c Sample Fail2.18
Fail
Fail 97 Fail 408
#99f Sample Fail2.34
Fail
Fail 103 Fail 459
#9c0 Sample Pass Level AA for large text3.08
Fail fo regular text
Fail 104 Fail 255
#9c3 Sample Pass Level AA for large text3.09
Fail fo regular text
Fail 110 Fail 306
#9c6 Sample Pass Level AA for large text3.13
Fail fo regular text
Fail 116 Fail 357
#9c9 Sample Pass Level AA for large text3.21
Fail fo regular text
Fail 121 Fail 408
#9cc Sample Pass Level AA for large text3.33
Fail fo regular text
Pass 127 Fail 459
#9cf Sample Pass Level AA for large text3.49
Fail fo regular text
Pass 133 Pass 510
#9f0 Sample Pass Level AAA for large text4.67
Pass level 2 fo regular text
Pass 134 Fail 306
#9f3 Sample Pass Level AAA for large text4.68
Pass level 2 fo regular text
Pass 140 Fail 357
#9f6 Sample Pass Level AAA for large text4.72
Pass level 2 fo regular text
Pass 146 Fail 408
#9f9 Sample Pass Level AAA for large text4.80
Pass level 2 fo regular text
Pass 151 Fail 459
#9fc Sample Pass Level AAA for large text4.91
Pass level 2 fo regular text
Pass 157 Pass 510
#9ff Sample Pass Level AAA for large text5.07
Pass level 2 fo regular text
Pass 163 Pass 561
#c00 Sample Fail1.00
Fail
Fail 0 Fail 0
#c03 Sample Fail1.01
Fail
Fail 5 Fail 51
#c06 Sample Fail1.05
Fail
Fail 11 Fail 102
#c09 Sample Fail1.13
Fail
Fail 17 Fail 153
#c0c Sample Fail1.24
Fail
Fail 23 Fail 204
#c0f Sample Fail1.40
Fail
Fail 29 Fail 255
#c30 Sample Fail1.13
Fail
Fail 29 Fail 51
#c33 Sample Fail1.15
Fail
Fail 35 Fail 102
#c36 Sample Fail1.19
Fail
Fail 41 Fail 153
#c39 Sample Fail1.26
Fail
Fail 47 Fail 204
#c3c Sample Fail1.38
Fail
Fail 53 Fail 255
#c3f Sample Fail1.54
Fail
Fail 59 Fail 306
#c60 Sample Fail1.53
Fail
Fail 59 Fail 102
#c63 Sample Fail1.55
Fail
Fail 65 Fail 153
#c66 Sample Fail1.59
Fail
Fail 71 Fail 204
#c69 Sample Fail1.66
Fail
Fail 77 Fail 255
#c6c Sample Fail1.78
Fail
Fail 83 Fail 306
#c6f Sample Fail1.94
Fail
Fail 88 Fail 357
#c90 Sample Fail2.28
Fail
Fail 89 Fail 153
#c93 Sample Fail2.29
Fail
Fail 95 Fail 204
#c96 Sample Fail2.33
Fail
Fail 101 Fail 255
#c99 Sample Fail2.41
Fail
Fail 107 Fail 306
#c9c Sample Fail2.52
Fail
Fail 113 Fail 357
#c9f Sample Fail2.68
Fail
Fail 118 Fail 408
#cc0 Sample Pass Level AA for large text3.42
Fail fo regular text
Fail 119 Fail 204
#cc3 Sample Pass Level AA for large text3.43
Fail fo regular text
Fail 125 Fail 255
#cc6 Sample Pass Level AA for large text3.47
Fail fo regular text
Pass 131 Fail 306
#cc9 Sample Pass Level AA for large text3.55
Fail fo regular text
Pass 137 Fail 357
#ccc Sample Pass Level AA for large text3.67
Fail fo regular text
Pass 143 Fail 408
#ccf Sample Pass Level AA for large text3.83
Fail fo regular text
Pass 148 Fail 459
#cf0 Sample Pass Level AAA for large text5.01
Pass level 2 fo regular text
Pass 149 Fail 255
#cf3 Sample Pass Level AAA for large text5.02
Pass level 2 fo regular text
Pass 155 Fail 306
#cf6 Sample Pass Level AAA for large text5.06
Pass level 2 fo regular text
Pass 161 Fail 357
#cf9 Sample Pass Level AAA for large text5.14
Pass level 2 fo regular text
Pass 167 Fail 408
#cfc Sample Pass Level AAA for large text5.25
Pass level 2 fo regular text
Pass 172 Fail 459
#cff Sample Pass Level AAA for large text5.41
Pass level 2 fo regular text
Pass 178 Pass 510
#f00 Sample Fail1.47
Fail
Fail 15 Fail 51
#f03 Sample Fail1.49
Fail
Fail 21 Fail 102
#f06 Sample Fail1.53
Fail
Fail 26 Fail 153
#f09 Sample Fail1.60
Fail
Fail 32 Fail 204
#f0c Sample Fail1.72
Fail
Fail 38 Fail 255
#f0f Sample Fail1.88
Fail
Fail 44 Fail 306
#f30 Sample Fail1.60
Fail
Fail 45 Fail 102
#f33 Sample Fail1.62
Fail
Fail 50 Fail 153
#f36 Sample Fail1.66
Fail
Fail 56 Fail 204
#f39 Sample Fail1.73
Fail
Fail 62 Fail 255
#f3c Sample Fail1.85
Fail
Fail 68 Fail 306
#f3f Sample Fail2.01
Fail
Fail 74 Fail 357
#f60 Sample Fail2.00
Fail
Fail 75 Fail 153
#f63 Sample Fail2.02
Fail
Fail 80 Fail 204
#f66 Sample Fail2.06
Fail
Fail 86 Fail 255
#f69 Sample Fail2.13
Fail
Fail 92 Fail 306
#f6c Sample Fail2.25
Fail
Fail 98 Fail 357
#f6f Sample Fail2.41
Fail
Fail 104 Fail 408
#f90 Sample Fail2.75
Fail
Fail 105 Fail 204
#f93 Sample Fail2.76
Fail
Fail 110 Fail 255
#f96 Sample Fail2.80
Fail
Fail 116 Fail 306
#f99 Sample Fail2.88
Fail
Fail 122 Fail 357
#f9c Sample Fail2.99
Fail
Pass 128 Fail 408
#f9f Sample Pass Level AA for large text3.15
Fail fo regular text
Pass 134 Fail 459
#fc0 Sample Pass Level AA for large text3.89
Fail fo regular text
Pass 134 Fail 255
#fc3 Sample Pass Level AA for large text3.91
Fail fo regular text
Pass 140 Fail 306
#fc6 Sample Pass Level AA for large text3.95
Fail fo regular text
Pass 146 Fail 357
#fc9 Sample Pass Level AA for large text4.02
Fail fo regular text
Pass 152 Fail 408
#fcc Sample Pass Level AA for large text4.14
Fail fo regular text
Pass 158 Fail 459
#fcf Sample Pass Level AA for large text4.30
Fail fo regular text
Pass 164 Pass 510
#ff0 Sample Pass Level AAA for large text5.48
Pass level 2 fo regular text
Pass 164 Fail 306
#ff3 Sample Pass Level AAA for large text5.50
Pass level 2 fo regular text
Pass 170 Fail 357
#ff6 Sample Pass Level AAA for large text5.54
Pass level 2 fo regular text
Pass 176 Fail 408
#ff9 Sample Pass Level AAA for large text5.61
Pass level 2 fo regular text
Pass 182 Fail 459
#ffc Sample Pass Level AAA for large text5.73
Pass level 2 fo regular text
Pass 188 Pass 510
#fff Sample Pass Level AAA for large text5.89
Pass level 2 fo regular text
Pass 194 Pass 561

Other Background Colour Combinations

Examine luminosity contrast ratios with other web safe backround colours.