Rage in classic WoW is the resource built by dealing and taking damage; it is 7.5 times damage dealt, or 2.5 times damage taken, over a level constant.
rage from damage dealt = 7.5 × damage / c
rage from damage taken = 2.5 × damage / c
c = 0.0091107836 × level² + 3.225598133 × level + 4.2652911 (230.6 at level 60)
Rage comes from the damage of white swings (and from damage taken), scaled by a level constant; at 60 that is one rage for every 30.7 damage dealt, or every 92 damage taken. Dealing more damage per swing is the same as dealing more rage per swing. The later rule that adds a term for the weapon's speed and hit type belongs to a later ruleset, not this one.
| Level 60, white hit for 400 | 7.5 × 400 / 230.6 = 13.0 rage |
| Level 60, white crit for 800 | 7.5 × 800 / 230.6 = 26.0 rage |
| Level 60, took 1,000 damage | 2.5 × 1,000 / 230.6 = 10.8 rage |
| Level 30 (c = 109.2), white hit for 60 | 7.5 × 60 / 109.2 = 4.1 rage |
Last checked: unverified against Forever. These are the long-established values of the classic ruleset (the 1.x game of 2005-2006); World of Warcraft Forever is in beta and may differ. When you test this one in Forever, post your numbers in Theorycraft.