Calculate Classical (Floor) Pivot Points:

The floor (classical) pivot points are the most popular type of pivot points used in forex trading. With this method the pivot points of the current period are derived from the high (H), low (L) and close (C) prices of the previous period. The rule to calculate the floor (classical) pivot points is as follows:
Pivot (P) = (H + L + C) / 3
Resistance 1 (P1) = (2 * P) - L
Resistance 2 (R2) = P + H - L
Resistance 3 (R3) = H + 2 * (P - L)
Support 1 (S1) = (2 * P) - H
Support 2 (S2) = P - H + L
Support 3 (S3) = L - 2 * (H - P)
(H: high; L: low; C: close; P: pivot)