A large sweet tea from the drive-thru lands right around 100mg of caffeine, roughly the same as a small coffee. Chick-fil-A publishes 100mg for a large iced tea, and McDonald's large sweet tea works out to about 100mg too. That is per Chick-fil-A's own caffeine page. Bottled Milo's and a homemade pitcher run lower per glass, but it all comes from real brewed black tea, so the number tracks with how strong and how big the pour is.
Here is the short version if you just want the answer: a large fast food sweet tea is about a small coffee, a 12oz bottle of Milo's is roughly half that, and a home-brewed 8oz glass sits near 47mg. Nobody is getting a jolt off sweet tea the way they would off cold brew, but it is not caffeine free either.
Why sweet tea has real caffeine
Sweet tea is just brewed black tea with sugar, so the caffeine is whatever steeps out of the leaves. Black tea naturally carries caffeine, and the USDA lists brewed black tea at 20mg per 100g, which is about 47mg in a standard 8 fl oz cup (USDA FoodData Central, brewed black tea). That is the baseline before you scale up to a 32oz cup packed with ice.
The reason a large drive-thru tea reads around 100mg and not 190mg is ice. A 32oz cup is maybe half ice, so you are drinking closer to 16oz of actual tea, and the brew at the restaurant is often lighter than a strong home steep. Sugar does nothing to the caffeine, it only changes the calories. So the caffeine tracks with two things: how much real tea is in the cup and how long it steeped.
Sweet tea caffeine by brand
| Sweet tea | Serving | Caffeine |
|---|---|---|
| McDonald's Sweet Tea (large) | 32 fl oz | ~100mg |
| Chick-fil-A Iced Tea (large) | large | 100mg |
| Chick-fil-A Iced Tea (medium) | medium | 72mg |
| Chick-fil-A Iced Tea (small) | small | 45mg |
| Milo's Famous Sweet Tea | 12 fl oz | 37 to 44mg |
| Homemade brewed black tea | 8 fl oz | ~47mg |
| Homemade brewed black tea | 16 fl oz | ~95mg |
Sources: Chick-fil-A caffeine page for the iced tea sizes; Milo's Tea Company FAQ for the 37 to 44mg per 12oz figure on Famous Sweet Tea; USDA FoodData Central for brewed black tea at 20mg per 100g, which scales to about 47mg per 8oz cup. McDonald's no longer publishes caffeine numbers, so the large sweet tea figure is a USDA-based estimate of roughly 3mg per fl oz across the drinkable tea in a 32oz cup, landing near 100mg.
One note on Chick-fil-A: the caffeine is the same whether you order it sweetened or unsweetened, because both are the same brewed tea. The sugar changes the calories, not the buzz. Same logic applies to Milo's, where the sweet, extra sweet, zero sugar, and unsweet versions all land within a few mg of each other because it is the same tea base.
For context, the FDA cites 400mg of caffeine a day as an amount generally not associated with negative effects in healthy adults. How caffeine affects you depends on your own tolerance and health, so treat these numbers as information, not advice.
Barista Life runs on coffee people. Browse the Barista Life shop to support the site.
How to dial in a homemade pitcher
If you brew your own, the caffeine is set by the number of tea bags and the steep time, not the sugar. A common Southern pitcher uses six to eight regular black tea bags for two quarts. That puts each 8oz glass somewhere in the 25 to 50mg range depending on how long you let it sit. Steep longer or add bags and you climb toward the high end. Use fewer bags or cut it with more water and you drop toward the low end.
Want it lighter without losing the flavor? Steep for the full time so you get the taste, then dilute the finished tea with extra cold water before you sweeten. You keep the sweet tea profile and knock the caffeine per glass down. Going the other way, a strong overnight cold steep with eight bags will push a 16oz glass past 100mg, closer to a real cup of coffee.
Related caffeine reads
For more tea numbers, see AriZona tea caffeine by flavor and how much caffeine is in Earl Grey. For everything else in one place, the Barista Life caffeine database collects the drink-by-drink breakdowns.
FAQ
Does sweet tea have as much caffeine as coffee? No. A large sweet tea is about 100mg, which is close to a small 8oz coffee, but a normal 12oz coffee runs 120 to 200mg. Ounce for ounce, coffee is roughly double sweet tea.
Is there caffeine in Milo's sweet tea? Yes. Milo's Famous Sweet Tea lists 37 to 44mg per 12oz serving on the company's own FAQ, because it is made from real brewed tea, not an added stimulant.
Does unsweetened tea have less caffeine than sweet tea? No. Sweetening only adds sugar and calories. The caffeine is identical because it comes from the same brewed tea leaves.