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 #f00

The following table shows the luminosity contrast ratios for all web safe colours with a background colour of #f00, along with the difference in brightness and the difference in colour used by the colour contrast analyser for comparison.

Luminosity Ratios with background: #f00
Foreground Colour Sample Luminosity Contrast Ratio Difference in Brightness Difference in Colour
#000 Sample Pass Level AAA for large text5.25
Pass level 2 fo regular text
Fail 76 Fail 255
#003 Sample Pass Level AAA for large text5.01
Pass level 2 fo regular text
Fail 70 Fail 306
#006 Sample Pass Level AA for large text4.41
Fail fo regular text
Fail 64 Fail 357
#009 Sample Pass Level AA for large text3.60
Fail fo regular text
Fail 58 Fail 408
#00c Sample Fail2.81
Fail
Fail 52 Fail 459
#00f Sample Fail2.15
Fail
Fail 47 Pass 510
#030 Sample Pass Level AA for large text3.56
Fail fo regular text
Fail 46 Fail 306
#033 Sample Pass Level AA for large text3.45
Fail fo regular text
Fail 40 Fail 357
#036 Sample Pass Level AA for large text3.15
Fail fo regular text
Fail 34 Fail 408
#039 Sample Fail2.72
Fail
Fail 28 Fail 459
#03c Sample Fail2.24
Fail
Fail 23 Pass 510
#03f Sample Fail1.80
Fail
Fail 17 Pass 561
#060 Sample Fail1.81
Fail
Fail 16 Fail 357
#063 Sample Fail1.78
Fail
Fail 10 Fail 408
#066 Sample Fail1.70
Fail
Fail 4 Fail 459
#069 Sample Fail1.56
Fail
Fail 1 Pass 510
#06c Sample Fail1.39
Fail
Fail 6 Pass 561
#06f Sample Fail1.21
Fail
Fail 12 Pass 612
#090 Sample Fail1.06
Fail
Fail 13 Fail 408
#093 Sample Fail1.07
Fail
Fail 19 Fail 459
#096 Sample Fail1.09
Fail
Fail 25 Pass 510
#099 Sample Fail1.15
Fail
Fail 31 Pass 561
#09c Sample Fail1.22
Fail
Fail 36 Pass 612
#09f Sample Fail1.33
Fail
Fail 42 Pass 663
#0c0 Sample Fail1.83
Fail
Fail 43 Fail 459
#0c3 Sample Fail1.84
Fail
Fail 49 Pass 510
#0c6 Sample Fail1.87
Fail
Fail 55 Pass 561
#0c9 Sample Fail1.92
Fail
Fail 60 Pass 612
#0cc Sample Fail2.00
Fail
Fail 66 Pass 663
#0cf Sample Fail2.11
Fail
Fail 72 Pass 714
#0f0 Sample Fail2.91
Fail
Fail 73 Pass 510
#0f3 Sample Fail2.92
Fail
Fail 79 Pass 561
#0f6 Sample Fail2.95
Fail
Fail 85 Pass 612
#0f9 Sample Pass Level AA for large text3.00
Fail fo regular text
Fail 90 Pass 663
#0fc Sample Pass Level AA for large text3.08
Fail fo regular text
Fail 96 Pass 714
#0ff Sample Pass Level AA for large text3.19
Fail fo regular text
Fail 102 Pass 765
#300 Sample Pass Level AAA for large text4.60
Pass level 2 fo regular text
Fail 60 Fail 204
#303 Sample Pass Level AA for large text4.42
Fail fo regular text
Fail 55 Fail 255
#306 Sample Pass Level AA for large text3.94
Fail fo regular text
Fail 49 Fail 306
#309 Sample Pass Level AA for large text3.28
Fail fo regular text
Fail 43 Fail 357
#30c Sample Fail2.61
Fail
Fail 37 Fail 408
#30f Sample Fail2.03
Fail
Fail 31 Fail 459
#330 Sample Pass Level AA for large text3.25
Fail fo regular text
Fail 31 Fail 255
#333 Sample Pass Level AA for large text3.16
Fail fo regular text
Fail 25 Fail 306
#336 Sample Fail2.91
Fail
Fail 19 Fail 357
#339 Sample Fail2.53
Fail
Fail 13 Fail 408
#33c Sample Fail2.11
Fail
Fail 7 Fail 459
#33f Sample Fail1.72
Fail
Fail 1 Pass 510
#360 Sample Fail1.73
Fail
Fail 1 Fail 306
#363 Sample Fail1.70
Fail
Fail 4 Fail 357
#366 Sample Fail1.62
Fail
Fail 10 Fail 408
#369 Sample Fail1.50
Fail
Fail 16 Fail 459
#36c Sample Fail1.34
Fail
Fail 22 Pass 510
#36f Sample Fail1.17
Fail
Fail 27 Pass 561
#390 Sample Fail1.08
Fail
Fail 28 Fail 357
#393 Sample Fail1.09
Fail
Fail 34 Fail 408
#396 Sample Fail1.12
Fail
Fail 40 Fail 459
#399 Sample Fail1.17
Fail
Fail 46 Pass 510
#39c Sample Fail1.25
Fail
Fail 52 Pass 561
#39f Sample Fail1.36
Fail
Fail 57 Pass 612
#3c0 Sample Fail1.86
Fail
Fail 58 Fail 408
#3c3 Sample Fail1.87
Fail
Fail 64 Fail 459
#3c6 Sample Fail1.90
Fail
Fail 70 Pass 510
#3c9 Sample Fail1.95
Fail
Fail 76 Pass 561
#3cc Sample Fail2.03
Fail
Fail 82 Pass 612
#3cf Sample Fail2.14
Fail
Fail 87 Pass 663
#3f0 Sample Fail2.94
Fail
Fail 88 Fail 459
#3f3 Sample Fail2.95
Fail
Fail 94 Pass 510
#3f6 Sample Fail2.98
Fail
Fail 100 Pass 561
#3f9 Sample Pass Level AA for large text3.03
Fail fo regular text
Fail 106 Pass 612
#3fc Sample Pass Level AA for large text3.11
Fail fo regular text
Fail 111 Pass 663
#3ff Sample Pass Level AA for large text3.22
Fail fo regular text
Fail 117 Pass 714
#600 Sample Pass Level AA for large text3.36
Fail fo regular text
Fail 45 Fail 153
#603 Sample Pass Level AA for large text3.26
Fail fo regular text
Fail 39 Fail 204
#606 Sample Fail2.99
Fail
Fail 34 Fail 255
#609 Sample Fail2.59
Fail
Fail 28 Fail 306
#60c Sample Fail2.16
Fail
Fail 22 Fail 357
#60f Sample Fail1.75
Fail
Fail 16 Fail 408
#630 Sample Fail2.58
Fail
Fail 15 Fail 204
#633 Sample Fail2.52
Fail
Fail 9 Fail 255
#636 Sample Fail2.35
Fail
Fail 4 Fail 306
#639 Sample Fail2.10
Fail
Fail 1 Fail 357
#63c Sample Fail1.80
Fail
Fail 7 Fail 408
#63f Sample Fail1.51
Fail
Fail 13 Fail 459
#660 Sample Fail1.52
Fail
Fail 14 Fail 255
#663 Sample Fail1.49
Fail
Fail 19 Fail 306
#666 Sample Fail1.44
Fail
Fail 25 Fail 357
#669 Sample Fail1.34
Fail
Fail 31 Fail 408
#66c Sample Fail1.21
Fail
Fail 37 Fail 459
#66f Sample Fail1.07
Fail
Fail 43 Pass 510
#690 Sample Fail1.17
Fail
Fail 44 Fail 306
#693 Sample Fail1.17
Fail
Fail 49 Fail 357
#696 Sample Fail1.20
Fail
Fail 55 Fail 408
#699 Sample Fail1.25
Fail
Fail 61 Fail 459
#69c Sample Fail1.33
Fail
Fail 67 Pass 510
#69f Sample Fail1.44
Fail
Fail 73 Pass 561
#6c0 Sample Fail1.94
Fail
Fail 74 Fail 357
#6c3 Sample Fail1.95
Fail
Fail 79 Fail 408
#6c6 Sample Fail1.98
Fail
Fail 85 Fail 459
#6c9 Sample Fail2.03
Fail
Fail 91 Pass 510
#6cc Sample Fail2.11
Fail
Fail 97 Pass 561
#6cf Sample Fail2.22
Fail
Fail 103 Pass 612
#6f0 Sample Pass Level AA for large text3.02
Fail fo regular text
Fail 103 Fail 408
#6f3 Sample Pass Level AA for large text3.03
Fail fo regular text
Fail 109 Fail 459
#6f6 Sample Pass Level AA for large text3.06
Fail fo regular text
Fail 115 Pass 510
#6f9 Sample Pass Level AA for large text3.11
Fail fo regular text
Fail 121 Pass 561
#6fc Sample Pass Level AA for large text3.19
Fail fo regular text
Pass 127 Pass 612
#6ff Sample Pass Level AA for large text3.30
Fail fo regular text
Pass 133 Pass 663
#900 Sample Fail2.23
Fail
Fail 30 Fail 102
#903 Sample Fail2.19
Fail
Fail 24 Fail 153
#906 Sample Fail2.06
Fail
Fail 18 Fail 204
#909 Sample Fail1.87
Fail
Fail 13 Fail 255
#90c Sample Fail1.63
Fail
Fail 7 Fail 306
#90f Sample Fail1.38
Fail
Fail 1 Fail 357
#930 Sample Fail1.86
Fail
Fail 0 Fail 153
#933 Sample Fail1.83
Fail
Fail 5 Fail 204
#936 Sample Fail1.74
Fail
Fail 11 Fail 255
#939 Sample Fail1.60
Fail
Fail 16 Fail 306
#93c Sample Fail1.42
Fail
Fail 22 Fail 357
#93f Sample Fail1.23
Fail
Fail 28 Fail 408
#960 Sample Fail1.23
Fail
Fail 29 Fail 204
#963 Sample Fail1.22
Fail
Fail 35 Fail 255
#966 Sample Fail1.18
Fail
Fail 41 Fail 306
#969 Sample Fail1.11
Fail
Fail 46 Fail 357
#96c Sample Fail1.02
Fail
Fail 52 Fail 408
#96f Sample Fail1.09
Fail
Fail 58 Fail 459
#990 Sample Fail1.32
Fail
Fail 59 Fail 255
#993 Sample Fail1.32
Fail
Fail 65 Fail 306
#996 Sample Fail1.35
Fail
Fail 70 Fail 357
#999 Sample Fail1.40
Fail
Fail 76 Fail 408
#99c Sample Fail1.48
Fail
Fail 82 Fail 459
#99f Sample Fail1.59
Fail
Fail 88 Pass 510
#9c0 Sample Fail2.09
Fail
Fail 89 Fail 306
#9c3 Sample Fail2.10
Fail
Fail 95 Fail 357
#9c6 Sample Fail2.13
Fail
Fail 100 Fail 408
#9c9 Sample Fail2.18
Fail
Fail 106 Fail 459
#9cc Sample Fail2.26
Fail
Fail 112 Pass 510
#9cf Sample Fail2.37
Fail
Fail 118 Pass 561
#9f0 Sample Pass Level AA for large text3.17
Fail fo regular text
Fail 119 Fail 357
#9f3 Sample Pass Level AA for large text3.18
Fail fo regular text
Fail 125 Fail 408
#9f6 Sample Pass Level AA for large text3.21
Fail fo regular text
Pass 130 Fail 459
#9f9 Sample Pass Level AA for large text3.26
Fail fo regular text
Pass 136 Pass 510
#9fc Sample Pass Level AA for large text3.34
Fail fo regular text
Pass 142 Pass 561
#9ff Sample Pass Level AA for large text3.45
Fail fo regular text
Pass 148 Pass 612
#c00 Sample Fail1.47
Fail
Fail 15 Fail 51
#c03 Sample Fail1.45
Fail
Fail 9 Fail 102
#c06 Sample Fail1.40
Fail
Fail 3 Fail 153
#c09 Sample Fail1.30
Fail
Fail 2 Fail 204
#c0c Sample Fail1.18
Fail
Fail 8 Fail 255
#c0f Sample Fail1.05
Fail
Fail 13 Fail 306
#c30 Sample Fail1.30
Fail
Fail 14 Fail 102
#c33 Sample Fail1.28
Fail
Fail 20 Fail 153
#c36 Sample Fail1.24
Fail
Fail 26 Fail 204
#c39 Sample Fail1.17
Fail
Fail 32 Fail 255
#c3c Sample Fail1.07
Fail
Fail 37 Fail 306
#c3f Sample Fail1.04
Fail
Fail 43 Fail 357
#c60 Sample Fail1.04
Fail
Fail 44 Fail 153
#c63 Sample Fail1.05
Fail
Fail 50 Fail 204
#c66 Sample Fail1.08
Fail
Fail 56 Fail 255
#c69 Sample Fail1.13
Fail
Fail 62 Fail 306
#c6c Sample Fail1.21
Fail
Fail 67 Fail 357
#c6f Sample Fail1.32
Fail
Fail 73 Fail 408
#c90 Sample Fail1.55
Fail
Fail 74 Fail 204
#c93 Sample Fail1.56
Fail
Fail 80 Fail 255
#c96 Sample Fail1.58
Fail
Fail 86 Fail 306
#c99 Sample Fail1.63
Fail
Fail 92 Fail 357
#c9c Sample Fail1.71
Fail
Fail 97 Fail 408
#c9f Sample Fail1.82
Fail
Fail 103 Fail 459
#cc0 Sample Fail2.32
Fail
Fail 104 Fail 255
#cc3 Sample Fail2.33
Fail
Fail 110 Fail 306
#cc6 Sample Fail2.36
Fail
Fail 116 Fail 357
#cc9 Sample Fail2.41
Fail
Fail 121 Fail 408
#ccc Sample Fail2.49
Fail
Pass 127 Fail 459
#ccf Sample Fail2.60
Fail
Pass 133 Pass 510
#cf0 Sample Pass Level AA for large text3.40
Fail fo regular text
Pass 134 Fail 306
#cf3 Sample Pass Level AA for large text3.41
Fail fo regular text
Pass 140 Fail 357
#cf6 Sample Pass Level AA for large text3.44
Fail fo regular text
Pass 146 Fail 408
#cf9 Sample Pass Level AA for large text3.49
Fail fo regular text
Pass 151 Fail 459
#cfc Sample Pass Level AA for large text3.57
Fail fo regular text
Pass 157 Pass 510
#cff Sample Pass Level AA for large text3.68
Fail fo regular text
Pass 163 Pass 561
#f00 Sample Fail1.00
Fail
Fail 0 Fail 0
#f03 Sample Fail1.01
Fail
Fail 5 Fail 51
#f06 Sample Fail1.04
Fail
Fail 11 Fail 102
#f09 Sample Fail1.09
Fail
Fail 17 Fail 153
#f0c Sample Fail1.17
Fail
Fail 23 Fail 204
#f0f Sample Fail1.27
Fail
Fail 29 Fail 255
#f30 Sample Fail1.09
Fail
Fail 29 Fail 51
#f33 Sample Fail1.10
Fail
Fail 35 Fail 102
#f36 Sample Fail1.13
Fail
Fail 41 Fail 153
#f39 Sample Fail1.18
Fail
Fail 47 Fail 204
#f3c Sample Fail1.26
Fail
Fail 53 Fail 255
#f3f Sample Fail1.37
Fail
Fail 59 Fail 306
#f60 Sample Fail1.36
Fail
Fail 59 Fail 102
#f63 Sample Fail1.37
Fail
Fail 65 Fail 153
#f66 Sample Fail1.40
Fail
Fail 71 Fail 204
#f69 Sample Fail1.45
Fail
Fail 77 Fail 255
#f6c Sample Fail1.53
Fail
Fail 83 Fail 306
#f6f Sample Fail1.64
Fail
Fail 88 Fail 357
#f90 Sample Fail1.87
Fail
Fail 89 Fail 153
#f93 Sample Fail1.88
Fail
Fail 95 Fail 204
#f96 Sample Fail1.90
Fail
Fail 101 Fail 255
#f99 Sample Fail1.96
Fail
Fail 107 Fail 306
#f9c Sample Fail2.03
Fail
Fail 113 Fail 357
#f9f Sample Fail2.14
Fail
Fail 118 Fail 408
#fc0 Sample Fail2.64
Fail
Fail 119 Fail 204
#fc3 Sample Fail2.65
Fail
Fail 125 Fail 255
#fc6 Sample Fail2.68
Fail
Pass 131 Fail 306
#fc9 Sample Fail2.73
Fail
Pass 137 Fail 357
#fcc Sample Fail2.81
Fail
Pass 143 Fail 408
#fcf Sample Fail2.92
Fail
Pass 148 Fail 459
#ff0 Sample Pass Level AA for large text3.72
Fail fo regular text
Pass 149 Fail 255
#ff3 Sample Pass Level AA for large text3.73
Fail fo regular text
Pass 155 Fail 306
#ff6 Sample Pass Level AA for large text3.76
Fail fo regular text
Pass 161 Fail 357
#ff9 Sample Pass Level AA for large text3.81
Fail fo regular text
Pass 167 Fail 408
#ffc Sample Pass Level AA for large text3.89
Fail fo regular text
Pass 172 Fail 459
#fff Sample Pass Level AA for large text4.00
Fail fo regular text
Pass 178 Pass 510

Other Background Colour Combinations

Examine luminosity contrast ratios with other web safe backround colours.