When substitutions between honey and brown sugar are made, the cook needs to take into account that one is dry while the other is liquid; wrongly interchanging the two in a recipe can completely alter its outcome. Take a few things into account when making this easy substitute to ensure it doesn't hurt your finished product.
Figure out how much honey is called for in the recipe. Each cup of honey should be replaced by 1 1/4 cup of brown sugar, as well as a 1/4 cup of liquid.
Reduce or completely take out any baking soda that was in the recipe. This was used to cut the acidity of the honey, but is no longer needed if using brown sugar.
Taste the mix. If it is not sweet enough, add more brown sugar gradually until the desired sweetness is achieved.