how much sugar

[jjay 7571]

I have 3 liters of juice with a specific gravity of 1.020. How much sugar do I need to add to achieve a specific gravity of 1.090?

I've tried an online calculator, and it suggests adding 275.4 grams of sugar. so just wanted to check this was right

Could anyone provide a reliable link to a calculator that can help determine the amounts of sugar and yeast required? For future reference, please.

 

[bernardsmith]

Not a calculator but a rule of thumb. Table sugar at 1 lb dissolved in water to make 1 US gallon will raise the gravity of the water by 45 points (1.045) - assume 1 lb = 453.6 g and 1 US gallon = 3785.4 ml.