Singapore Evolution CP Multiplier

It is called Evolution CP Multiplier because the CP your Pokemon would get when it evolves is multiplied by the range of Min, Avg and Max multiplier. For example, Magikarp is showed to have an average CP multiplier of 11x, which means you can expect to get a 1,100 +/- CP Gyraros for evolving a 100 CP Magikarp. The multiplier range you get for evolution is completely random.

No.PokémonCandies NeededMin CP MultiplierMax CP MultiplierAvg CP Multiplier
1Bulbasaur251.53x1.58x1.555x
2Ivysaur1001.2x1.61x1.405x
4Charmander251.64x1.7x1.67x
5Charmeleon1001.71x1.73x1.72x
7Squirtle251.63x1.66x1.645x
8Wartortle1001.4x1.65x1.525x
10Caterpie121.04x1.08x1.06x
11Metapod503.52x3.79x3.655x
13Weedle121.06x1.1x1.08x
14Kakuna503.3x3.42x3.36x
16Pidgey121.82x1.95x1.885x
17Pidgeotto501.73x1.78x1.755x
19Rattata252.61x2.73x2.67x
21Spearow502.58x2.81x2.695x
23Ekans502.2x2.33x2.265x
25Pikachu502.33x2.38x2.355x
27Sandshrew502.35x2.76x2.555x
29Nidoran251.62x1.66x1.64x
30Nidorina1001.8x2.04x1.92x
32Nidoran251.65x1.7x1.675x
33Nidorino1001.64x1.86x1.75x
35Clefairy502.02x2.2x2.11x
37Vulpix502.68x2.74x2.71x
39Jigglypuff502.41x2.47x2.44x
41Zubat502.9x3.33x3.115x
43Oddish251.48x1.51x1.495x
44Gloom1001.48x1.53x1.505x
46Paras501.92x2.02x1.97x
48Venonat501.85x1.9x1.875x
50Diglett502.68x2.77x2.725x
52Meowth501.98x2.24x2.11x
54Psyduck502.22x2.29x2.255x
56Mankey502.15x2.28x2.215x
58Growlithe502.25x2.36x2.305x
60Poliwag251.72x1.89x1.805x
61Poliwhirl1001.9x1.96x1.93x
63Abra251.36x2x1.68x
64Kadabra1001.41x1.65x1.53x
66Machop251.62x1.67x1.645x
67Machoke1001.48x1.7x1.59x
69Bellsprout251.54x1.6x1.57x
70Weepinbell1001.47x1.52x1.495x
72Tentacool502.47x2.6x2.535x
74Geodude251.71x1.76x1.735x
75Graveler1001.63x1.72x1.675x
77Ponyta501.47x1.6x1.535x
79Slowpoke502.19x2.21x2.2x
81Magnemite502.16x2.2x2.18x
84Doduo502.11x2.24x2.175x
86Seel501.96x2.03x1.995x
88Grimer502.03x2.17x2.1x
90Shellder502.62x2.65x2.635x
92Gastly251.75x1.83x1.79x
93Haunter1001.53x1.8x1.665x
96Drowzee502.05x2.11x2.08x
98Krabby502.35x2.4x2.375x
100Voltorb502.01x2.03x2.02x
102Exeggcute502.7x3.18x2.94x
104Cubone501.65x1.67x1.66x
109Koffing501.95x2.1x2.025x
111Rhyhorn501.9x1.91x1.905x
116Horsea502.19x2.23x2.21x
118Goldeen502.14x2.24x2.19x
120Staryu502.35x2.44x2.395x
129Magikarp40010.1x11.96x11.03x
134Vaporeon-2.62x2.67x2.645x
135Jolteon-2.01x2.09x2.05x
136Flareon-2.46x2.64x2.55x
138Omanyte501.99x2.12x2.055x
140Kabuto501.97x2.37x2.17x
147Dratini251.8x1.85x1.825x
148Dragonair1002.03x2.08x2.055x

Source