The DARKROOM COOKBOOK, Third Edition

TABLE 4 Comparison of Thermometer Scales
Basic conversion factors
To convert Fahrenheit into Centigrade: To convert Centigrade into Fahrenheit:
Subtract 32; multiply by 5 and divide by 9. Multiply by 9; divide by 5; add 32 to result,
Example: 125ºF � 32 � 93 � 5 � 465 � 9 � Example: 18ºC � 9 � 162 � 5 � 32.4 � 32 �
51.67ºC 64.4ºF.
ºC ºF ºC ºF ºC ºF ºC ºF ºC ºF ºC ºF
�100 �212
99.44 211 74.44 166 49.44 121 24.44 76 �0.55 31 �25.55 �14
98.89 210 73.89 165 48.89 120 23.89 75 �1.11 30 �26.11 �15
98.33 209 73.33 164 48.33 119 23.33 74 �1.67 29 �26.67 �16
97.78 208 72.78 163 47.78 118 22.78 73 �2.22 28 �27.22 �17
97.22 207 72.22 162 47.22 117 22.22 72 �2.73 27 �27.78 �18
96.67 206 71.67 161 46.67 116 21.67 71 �3.33 26 �28.33 �19
96.11 205 71.11 160 46.11 115 21.11 70 �3.89 25 �28.89 �20
95.55 204 70.55 159 45.55 114 20.55 69 �4.44 24 �29.44 �21
95 203 70 158 45 113 20 68 �5 23 �30 �22
94.44 202 69.44 157 44.44 112 19.44 67 �5.55 22 �30.55 �23
93.89 201 68.89 156 43.89 111 18.89 66 �6.11 21 �31.11 �24
93.33 200 68.33 155 43.33 110 18.33 65 �6.67 20 �31.67 �25
92.78 199 67.78 154 42.78 109 17.78 64 �7.22 19 �32.22 �26
92.22 198 67.22 153 42.22 108 17.22 63 �7.78 18 �32.78 �27
91.67 197 66.67 152 41.67 107 16.67 62 �8.33 17 �33.33 �28
91.11 196 66.11 151 41.11 106 16.11 61 �8.89 16 �33.89 �29
90.55 195 65.56 150 40.55 105 15.55 60 �9.44 15 �34.44 �30
90 194 65 149 40 104 15 59 �10 14 �35 �31
89.44 193 64.44 148 39.44 103 14.44 58 �10.55 13 �35.55 �32
88.89 192 63.89 147 38.89 102 13.89 57 �11.11 12 �36.11 �33
88.33 191 63.33 146 38.33 101 13.33 56 �11.67 11 �36.67 �34
87.78 190 62.78 145 37.78 100 12.78 55 �12.22 10 �37.22 �35
87.22 189 62.22 144 37.22 99 12.22 54 �12.78 9 �37.78 �36
86.67 188 61.67 143 36.67 98 11.67 53 �13.33 8 �38.33 �37
86.11 187 61.11 142 36.11 97 11.11 52 �13.89 7 �38.89 �38
85.55 186 60.55 141 35.55 96 10.55 51 �14.44 6 �39.44 �39
85 185 60 140 35 95 10 50 �15 5 �40 �40
84.44 184 59.44 139 34.44 94 9.44 49 �15.55 4
83.89 183 58.89 138 33.89 93 8.89 48 �16.11 3
83.33 182 58.33 137 33.33 92 8.33 47 �16.67 2
82.78 181 57.78 136 32.78 91 7.78 46 �17.22 1
82.22 180 57.22 135 32.22 90 7.22 45 �17.78 0
81.67 179 56.67 134 31.67 89 6.67 44 �18.33 �1
81.11 178 56.11 133 31.11 88 6.11 43 �18.89 �2
80.55 177 55.55 132 30.55 87 5.55 42 �19.44 �3
80 176 55 131 30 86 5 41 �20 �4
79.44 175 54.44 130 29.44 85 4.44 40 �20.55 �5
78.89 174 53.89 129 28.89 84 3.89 39 �21.11 �6
78.33 173 53.33 128 28.33 83 3.33 38 �21.67 �7
77.78 172 52.78 127 27.78 82 2.78 37 �22.22 �8
77.22 171 52.22 126 27.22 81 2.22 36 �22.78 �9
76.67 170 51.67 125 26.67 80 1.67 35 �23.33 �10
76.11 169 51.11 124 26.11 79 1.11 34 �23.39 �11
75.55 168 50.55 123 25.55 78 0.55 33 �24.44 �12
75 167 50 122 25 77 0 32 �25 �13