Yes, sweet tea contains caffeine. A standard 16-ounce glass of homemade sweet tea has roughly 41 mg of caffeine, though the exact amount depends on how it’s brewed, how long the tea steeps, and where you buy it. Sweet tea is made from black tea, which is naturally caffeinated, and adding sugar doesn’t change the caffeine content at all.
How Much Caffeine Is in Sweet Tea
Homemade sweet tea averages about 2.5 mg of caffeine per fluid ounce. That works out to roughly 20 mg in an 8-ounce cup or 41 mg in a 16-ounce glass. That’s a moderate amount, enough to give you a mild energy lift but far less than a cup of coffee.
Fast-food sweet tea tends to be stronger. McDonald’s sweet tea contains about 3.1 mg per fluid ounce, which means a 16-ounce medium has around 50 mg of caffeine and a 32-ounce large delivers approximately 100 mg. Chick-fil-A’s version is even more concentrated at roughly 3.9 mg per fluid ounce: about 62 mg in a medium (16 oz) and 87 mg in a large (22.5 oz). If you’re drinking a large sweet tea from a drive-through, you’re getting roughly the same caffeine as a cup of coffee.
Bottled sweet teas from the grocery store fall on the lower end. Gold Peak Sweet Tea, for example, contains 32 mg per 12-ounce serving. Most bottled brands land somewhere in that range, since they’re brewed in controlled batches with consistent recipes.
Why Caffeine Levels Vary So Much
The biggest factor is brewing. Hotter water pulls caffeine out of tea leaves faster and more completely. Research published in the Journal of Chemical Education found that tea steeped at boiling temperature (100°C) released caffeine rapidly, peaking at about 47 mg per 8 ounces within six minutes. Tea steeped in lukewarm or room-temperature water extracted far less. So a batch of sweet tea made with boiling water and a long steep will have noticeably more caffeine than one brewed at a lower temperature or steeped briefly.
Steeping time matters, but only up to a point. At high temperatures, caffeine concentration climbs quickly for the first several minutes, then levels off. Letting your tea bags sit for 10 minutes instead of 5 won’t dramatically increase the caffeine once it’s already plateaued. The type of black tea also plays a role. Different varieties naturally contain different amounts of caffeine, and the ratio of tea to water in the recipe changes the final concentration.
Sweet Tea vs. Coffee and Soda
Sweet tea sits in the middle of the caffeine spectrum. A standard 8-ounce cup of brewed coffee contains 80 to 100 mg of caffeine, roughly four times the amount in the same size serving of sweet tea. A 12-ounce can of Coca-Cola has about 34 mg, which is comparable to a similar-sized glass of sweet tea. Diet Coke runs slightly higher at around 46 mg per can.
The catch is serving size. Most people don’t drink 8 ounces of sweet tea. A restaurant glass is usually 16 to 32 ounces, and refills are free. Two or three large glasses over a meal can put you in the same caffeine range as a couple of cups of coffee without you realizing it.
Decaf Sweet Tea Still Has Some Caffeine
If you’re trying to avoid caffeine entirely, decaf sweet tea won’t get you to zero. Decaffeinated black tea still contains about 2 mg per 8-ounce serving. That’s a tiny amount, practically negligible for most people, but worth knowing if you’re highly sensitive to caffeine or avoiding it for medical reasons.
How Sweet Tea Fits Into Daily Limits
The FDA considers up to 400 mg of caffeine per day safe for most adults, a threshold supported by a 2017 systematic review of health outcomes. A single 16-ounce glass of homemade sweet tea at 41 mg barely dents that limit. Even a large McDonald’s sweet tea at 100 mg leaves plenty of room. The real issue is when sweet tea combines with other caffeine sources throughout the day: morning coffee, an afternoon soda, maybe a chocolate bar. Those stack up.
For children and pregnant individuals, the safe threshold is lower, and the sugar content in sweet tea is often a bigger concern than the caffeine itself. A 32-ounce sweet tea can contain 60 grams of added sugar or more, depending on the recipe. The caffeine is moderate, but the sugar adds up fast at large serving sizes.