Calculating changes in specific gravity

[Hopperty]

How do I calculate the change in SG when I add an ingredient like sugar ?

for instance what difference would 300g of sugar make to 5 gallon of brew.

is there a formula or table I could use?

 

[Richard_H]

According to Brewers Friend 300g would add 0.72% in a 5 gallon batch. I highly recommend using that site for free and easy to use calculators
https://www.brewersfriend.com/stats/

 

[Hopperty]

which calculate would I use, there is many and I don't understand the terms they are using.

 

[Richard_H]

Use the complete recipe builder, add in your grains or liquid malt by weight and batch size to get a target SG. You can add other fermentable's such as sugar or honey. Also if you know what yeast your using then it will give you an expected FG.

Very handy for when making up a recipe from scratch and will give you an idea of the IBU and colour
https://www.brewersfriend.com/homebrew/recipe/calculator