Enter the initial sugar content and the final gravity into the calculator to determine the residual sugar content in grams per liter. This calculator helps in assessing the sweetness of wine or beer after fermentation.

Residual Sugar Formula

The following formula is used to calculate the residual sugar content:

RS = IS * FG

Variables:

  • RS is the residual sugar content (grams per liter)
  • IS is the initial sugar content (grams per liter)
  • FG is the final gravity (specific gravity)

To calculate the residual sugar content, multiply the initial sugar content by the final gravity.

What is Residual Sugar?

Residual sugar refers to the amount of sugar remaining in wine or beer after the fermentation process has completed. It is an indicator of sweetness and is measured in grams per liter. The level of residual sugar can affect the taste, body, and overall balance of the beverage. It is an important parameter for winemakers and brewers to control in order to achieve the desired flavor profile.

How to Calculate Residual Sugar?

The following steps outline how to calculate the Residual Sugar.


  1. First, determine the initial sugar content (IS) in grams per liter.
  2. Next, determine the final gravity (FG) as a specific gravity unit.
  3. Next, gather the formula from above = RS = IS * FG.
  4. Finally, calculate the Residual Sugar (RS) in grams per liter.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem:

Use the following variables as an example problem to test your knowledge.

Initial sugar content (IS) = 200 grams per liter

Final gravity (FG) = 1.010 specific gravity