Coke Zero Vs Diet Coke Caffeine Content

Both Coke Zero Sugar and Diet Coke contain caffeine. However, the caffeine content is not the same in each soda. The table below shows a comparison of the caffeine in each beverage.

Serving SizeCoke Zero Sugar – Caffeine (mg)Diet Coke – Caffeine (mg)
7.5 fl oz2128
12 fl oz3446
20 fl oz5776

Ingredients

Caffeine is an added ingredient in Coke Zero Sugar and Diet Coke. Since it is added and not naturally occurring, caffeine is included in the ingredients list for each beverage.

Coca-Cola Zero Sugar – Carbonated Water, Caramel Color, Phosphoric Acid, Aspartame, Potassium Benzoate (To Protect Taste), Natural Flavors, Potassium Citrate, Acesulfame Potassium, Caffeine.

Diet Coke – Carbonated Water, Caramel Color, Aspartame, Phosphoric Acid, Potassium Benzoate (To Protect Taste), Natural Flavors, Citric Acid, Caffeine.

Caffeine Comparison

Coke Zero Sugar and Diet Coke have low to moderate caffeine levels for their 12-ounce serving sizes. Pepsi Zero Sugar is a good alternative if you are looking for more caffeine in your soda. However, if you are looking for no caffeine, Coke offers Caffeine Free Coke Zero Sugar and Diet Caffeine Free Coke.

BeverageServing SizeCaffeine (mg)
Coke Zero12 fl oz34
Diet Coke12 fl oz46
Diet Pepsi12 fl oz35
Pepsi Zero Sugar12 fl oz69
Diet Dr Pepper12 fl oz41
Coca-Cola Classic12 fl 34
MTN Dew12 fl oz54
Diet MTN Dew12 fl oz54
Pepsi12 fl oz38
RC Cola12 fl oz43
Red Bull12 fl oz114
Monster Energy12 fl oz120
Coffee12 fl oz136*
*Source – USDA. Caffeine is approximate.

Sources:
us.coca-cola.com
dietcoke.com
Coca-Cola Zero Image Credit – Rob Marquardt/flickr