Tiles have different values depending on the rarity and difficulty of the letter. Below are the different point values for each letter:
English:
1 Point - A, E, I, L, N, O, R, S and T
2 Points - D and U
3 Points - G and M
4 Points - B, C, F, H, P, V, W and Y
5 Points - K
8 Points - X
10 Points - J, Q and Z