In general, substituting honey for sugar seems to be a matter of taste. Some people use it cup for cup, others prefer 1/2 cup – 2/3 cup of honey per cup of white sugar. Reduce the amount of other liquids by 1/4 cup for every cup of honey used.
However, you might need to experience with different amounts of honey depending on the recipe. For example, I used honey instead of sugar for a toffee bar recipe which involved boiling a sugar mixture. Honey does not boil the same way and when I poured it over the crackers it was super thin and slid right through. I was able to save the toffee bars by freezing them immediately but the toffee was on the bottom of the bar and not the middle. The next time I made the recipe I used much less honey and a little bit of sugar to get the consistency I needed up boil. I also selected a darker honey.
Sites on how to Substitute Honey for Sugar: Cooks.com, LiveStrong.com, and WholeNewMom.com