A typical sweet tea contains about 48 mg of caffeine per 8-ounce serving when brewed from black tea at home. Bottled and fast-food versions range lower, from about 26 to 32 mg per 8 ounces, depending on the brand. That’s roughly half the caffeine in a same-size cup of coffee, making sweet tea a moderate source of caffeine that most people can enjoy without a second thought.
Homemade vs. Bottled Sweet Tea
Sweet tea is brewed black tea with sugar added, so its caffeine content mirrors that of regular black tea. When you brew it yourself, expect around 48 mg of caffeine per 8-ounce glass. The sugar doesn’t change the caffeine level at all.
Bottled and ready-to-drink sweet teas consistently have less caffeine than freshly brewed. Gold Peak Sweet Iced Tea, one of the most popular grocery store brands, contains 32 mg per 12-ounce serving, which works out to roughly 21 mg per 8 ounces. According to Mayo Clinic data, ready-to-drink bottled black teas average about 26 mg per 8 ounces. The lower numbers make sense: commercial bottling processes often dilute the tea concentrate, and shelf-stable formulas prioritize consistent flavor over strong brewing.
Fast-Food Sweet Tea by Size
If you’re grabbing sweet tea from a drive-through, the size of your cup matters more than the brand. A large McDonald’s sweet tea (32 oz) contains about 100 mg of caffeine total. That’s only about 3 mg per ounce, so it’s relatively dilute, but the sheer volume of a large cup adds up.
Chick-fil-A lists its iced tea caffeine by size:
- Small: 45 mg
- Medium: 72 mg
- Large: 100 mg
Both chains land in a similar range for their large cups. If you’re watching your caffeine, ordering a small keeps you well under 50 mg, comparable to about half a cup of coffee.
How Sweet Tea Compares to Coffee and Soda
An 8-ounce cup of brewed coffee contains roughly 95 mg of caffeine, nearly double what you’d get from the same amount of homemade sweet tea and almost four times the caffeine in a bottled version. A 12-ounce can of cola typically has 30 to 40 mg, putting it in the same ballpark as bottled sweet tea.
The practical takeaway: sweet tea sits in the middle of the caffeine spectrum. It gives you a mild lift without the jolt of coffee. Even a 32-ounce large from a fast-food restaurant delivers only about as much caffeine as a single standard cup of brewed coffee.
What Changes the Caffeine Level
Not all sweet tea is created equal. A few variables can shift the caffeine content noticeably.
Steeping time is the biggest factor you can control at home. Research published in Food Research International found that caffeine extraction increases significantly with longer brew times, especially during the first 10 minutes. A tea bag dunked for 2 minutes will produce a lighter, lower-caffeine brew than one left steeping for 5 or 10 minutes. If you’re making a big pitcher and letting the bags sit while the water cools, you’re pulling more caffeine into the final product.
Water temperature also plays a role. Boiling water extracts caffeine faster and more completely than warm water. Cold-brewed sweet tea, steeped in the fridge overnight, generally ends up with less caffeine than a hot-brewed batch, even with a longer steeping window.
The type of tea leaves matters too. Most traditional sweet tea uses standard black tea (think Luzianne or Lipton). If you swap in green tea as the base, you’ll get somewhat less caffeine per cup, since green tea leaves are processed differently and release caffeine at a lower rate. Herbal “tea” bases like hibiscus or rooibos contain zero caffeine but won’t taste anything like classic sweet tea.
How It Fits Into Daily Caffeine Limits
The FDA considers up to 400 mg of caffeine per day safe for most healthy adults. At 48 mg per 8-ounce glass, you could drink over eight glasses of homemade sweet tea before hitting that ceiling. Even accounting for a couple of large fast-food cups at 100 mg each, you’d still be well within the recommended range, assuming you’re not also drinking coffee or energy drinks throughout the day.
The bigger health consideration with sweet tea is usually the sugar, not the caffeine. A 32-ounce fast-food sweet tea can pack 60 to 80 grams of added sugar. If you’re brewing at home, you have full control over how much sugar goes in, and the caffeine stays the same regardless.