A small AddOn to show in real time your hit rate against your current target. Click on display to toggle spell hit / melee hit.

You have to set up a Data Broker addon display to see something. It's currently in beta stage. In the tooltip you can see what contributes to your hit rate (stuff, talents, auras). Hope it's accurate if your toon is lvl80. Should work for other lvl but may be not accurate if lvl difference between you and your target is to high.

hit food, if used, is considered as stuff enhancement but I have an issue with stat refresh. After eating hit food you may have to target something to refresh the stats.

For melee calculation, you have standard hit and dualwield hit displayed.