It really depends in how many points per pound per gallon (Ppg) your honey contains.
Now that you know the points per pound per gallon of your honey you calculate the specific gravity contribution it will make to your wort. Multiply ppg by pounds of honey then divide by gallons of wort.
For example, if your honey's ppg is 24 and you use 4 lbs in 5 gallons you have:
24 * 4 / 5 = 19.2
Your honey adds 19.2 points, or 1.0192 specific gravity, to the wort. Use software to figure the wort without honey (or do it by hand), then add 1.0192 to the SG.
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