This isn't really accurate. For a Sword and Board Paladin, sure.
However, for a THF'ing paladin it is:
Paladin Divine Might I: Adds +2 to damage (equivalent of +3 STR, w/out the AB)
Paladin Divine Might II: Adds +4 to damage (equivalent of +6 STR, w/out the AB)
Paladin Divine Might III: Adds +6 to damage (equivalent of +8 STR, w/out the AB)
Paladin Divine Might VI: Adds +8 to damage (equivalent of +10 STR, w/out the AB)
Due to the 1.5x mechanic. Obviously this depends on what strength tiers would be reached with but it is a rough equivalent.
For a TWF'ing paladin it is more difficult, but I'll try:
Paladin Divine Might I: Adds +2 to damage (equivalent of +5 STR, w/out the AB)
Paladin Divine Might II: Adds +4 to damage (equivalent of +10 STR, w/out the AB)
Paladin Divine Might III: Adds +6 to damage (equivalent of +16 STR, w/out the AB)
Paladin Divine Might VI: Adds +8 to damage (equivalent of +22 STR, w/out the AB)
This is pretty rough but I found it benefited me just to think of it in that context. The strength bonuses here aren't considering a difference in proc rate (+10% doublestrike, 80% offhand, 30% difference). Taking that into account would lower it a fair bit but not sure how to add that up (or if it needs to be added up different).