Seltzer Water Drinks That Taste Like Soda
Fizzy and ginger in it. 3 min to make.
How much sugar and caffeine is in a Diet Coke?
A 12 fl oz can of Diet Coke has no sugar (0 g) and 46 mg of caffeine. The caffeine is 12% of the 400 mg a day the FDA cites for most healthy adults. Source: coca-cola.com, checked 13 November 2026.
Diet Coke by size
What that looks like in teaspoons
One cube is one teaspoon, or 4 g of sugar.
12 fl oz can0 g = 0 tsp
No sugar: nothing to stack.
Check your own day.
Set how many Diet Coke you drink and see the week, the month and the year. Change the drink to compare.
Check a drink
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 Diet Coke for.
Questions about Diet Coke.
How much sugar is in a Diet Coke?
Diet Coke has 0 g of sugar in a 12 fl oz can.
How much caffeine is in a Diet Coke?
A 12 fl oz can has 46 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 caffeine is that in a week at one a day?
322 mg over seven days, or 46 mg on each day. The checker above works it out for your own count.
What can I drink instead of Diet Coke?
Try Seltzer Water Drinks That Taste Like Soda, Shirley Temple Mocktail or Mocktail Recipes. Each is a short recipe on this site that keeps what you like about Diet Coke: 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).
- Diet Coke, 12 fl oz can: sugar from coca-cola.com, caffeine from coca-cola.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. Diet Coke is a trademark of its owner; FizzFree is not connected to it.