Homemade Kombucha
Fizzy, a gentler caffeine lift and black tea in it. 30 min to make.
How much sugar and caffeine is in a Rockstar?
A 16 fl oz can of Rockstar Original has 63 g of sugar (about 16 teaspoons) and 161 mg of caffeine. That is over the American Heart Association's daily added-sugar limits for women (25 g) and men (36 g). Source: rockstarenergy.com, checked 13 November 2026.
Rockstar Original by size
What that looks like in teaspoons
One cube is one teaspoon, or 4 g of sugar.
16 fl oz can63 g = 16 tsp
Check your own day.
Set how many Rockstar you drink and see the week, the month and the year. Change the drink to compare.
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mg caffeine a day
| Measure | Day | Week | 30 days | Year |
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Swap it.
Drinks you can make at home that keep what you reach for Rockstar Original for.
Iced Tea From Tea Bags
A gentler caffeine lift and black tea in it. 10 min to make.
Arnold Palmer Drink
A gentler caffeine lift and black tea in it. 15 min to make.
Questions about Rockstar.
How much sugar is in a Rockstar?
A 16 fl oz can has 63 g of sugar. At 4 g per teaspoon that is about 16 teaspoons.
How much caffeine is in a Rockstar?
A 16 fl oz can has 161 mg of caffeine. For comparison, the FDA cites 400 mg a day as an amount not generally associated with negative effects for most healthy adults.
How much sugar is that in a year at one 16 fl oz can a day?
23.0 kg of sugar, about 5,749 teaspoons, across 365 cans. The Swap Lab checker above works it out for your own number of drinks per day or week.
How does Rockstar compare with the daily sugar limits?
That is over the American Heart Association's daily added-sugar limits for women (25 g) and men (36 g).
What can I drink instead of Rockstar?
Try Homemade Kombucha, Iced Tea From Tea Bags or Arnold Palmer Drink. Each is a short recipe on this site that keeps what you like about Rockstar: cold, and with a lift if you want one.
Read next
Check another drink
Where the numbers come from.
Every figure is from the maker's own US nutrition page or label, or from the USDA's FoodData Central database, checked 13 November 2026. Recipes and formulas change, so the label on your can has the final word.
- Teaspoons: 4 g of sugar counts as 1 teaspoon (MedlinePlus).
- Sugar limits: the American Heart Association suggests no more than 25 g of added sugar a day for women and 36 g for men (heart.org).
- Caffeine: the FDA cites 400 mg a day as an amount not generally associated with negative effects for most healthy adults (fda.gov).
- Rockstar Original, 16 fl oz can: sugar from rockstarenergy.com, caffeine from rockstarenergy.com.
FizzFree is a habit tracker and not medical advice. If you have a health condition or take medication, talk to your doctor before changing what you drink. Rockstar Original is a trademark of its owner; FizzFree is not connected to it.