How much sugar to put in a keg of beer?

* Fermentation is complete: By the time beer is in a keg, fermentation is typically finished. Adding sugar would restart fermentation, potentially creating unwanted pressure and off-flavors.

* Sugar is for priming: If you're looking to add carbonation, you would typically add sugar to bottles or cans before capping, not a keg. This process is called "priming" and allows for natural carbonation during bottle conditioning.

* Kegs use forced carbonation: Most commercial kegs are carbonated using forced carbonation systems, which involve injecting CO2 into the keg. This process doesn't rely on added sugar.

If you're looking to add sweetness to your beer:

* Consider a different style: Some beer styles are naturally sweeter than others. If you prefer a sweeter beer, choose a style that is typically sweet, like a barleywine or a sweet stout.

* Experiment with different recipes: If you're homebrewing, you can experiment with different recipes that include sweetness. You can use specialty malts, adjuncts, or even fruit to add sweetness.

Important note: If you're unsure about anything related to your beer, it's best to consult with a professional brewer or homebrew expert.