Paladins are basically a hybrid class that mixes melee and casting abilities. Mostly paladins are known to have a raid role of healer, having strong buffs and healing abilities.

The Holy talent build is littered with buffs (mainly for casters) and healing skills. Here's a calculator for all the healing values you need to know kindly created by Nex from the IGN Vault. It has fields for your healing gear, mana per five, and mana pool plus crit chance not including Holy Talents. Cast times are also included, so you can calculate how many times you can heal in a fray.

Actual mana cost is also included as paladins have abilities to regain mana and gear that helps mana regen. Average heals, healing per mana, healing per second, and healing to OOM are also included. Oh, and by the way, the calculations are done for level 70.

Download: [Paladin Healing Calculator]