A single yerba mate tea bag brewed in 8 ounces of water contains roughly 20 to 60 milligrams of caffeine. That’s a wide range, and where you land within it depends on how long you steep, how hot your water is, and which brand you’re using.
Caffeine in a Typical Cup
Most yerba mate tea bags fall in the 20 to 40 mg range for a standard brew, meaning you poured near-boiling water over the bag and let it sit for a few minutes. That puts a quick-steeped cup closer to green tea territory. A longer steep pushes the number higher, potentially reaching 60 mg or more, which starts to approach the lower end of a cup of coffee.
The tea bag format matters here. Loose-leaf yerba mate brewed traditionally (in a gourd, refilled multiple times with hot water) delivers considerably more caffeine per session, often 70 to 80 mg per 8-ounce equivalent. Tea bags contain a smaller, more controlled amount of leaf, so they consistently produce a milder cup.
How Steeping Changes Your Caffeine
The single biggest variable you control is steeping time. A short steep of 1 to 3 minutes gives you a lighter cup with less caffeine extracted from the leaves. A medium steep of 4 to 7 minutes pulls out a balanced amount. And if you leave the bag in for 8 minutes or longer, you’re getting a noticeably stronger cup with more caffeine and a more bitter flavor.
Water temperature plays a role too. Hotter water extracts caffeine faster and more completely. If you brew with water just off the boil (around 200°F), you’ll get more caffeine than if you use water that’s cooled to 170°F. So a long steep with very hot water sits at the top of that 20 to 60 mg range, while a quick dip in cooler water sits at the bottom.
How Yerba Mate Compares to Coffee and Tea
For context, here’s how an 8-ounce serving stacks up across common caffeinated drinks:
- Yerba mate tea bag: 20–60 mg
- Green tea: 30–50 mg
- Brewed coffee: 95–200+ mg
A yerba mate tea bag overlaps with green tea and sits well below coffee. If you’re switching from coffee to yerba mate tea bags expecting a similar kick, you’ll likely need two or three cups to match a single mug of drip coffee. On the other hand, if you’re trying to cut back on caffeine without going cold turkey, a single tea bag is a gentle step down.
Many people who drink yerba mate describe the energy as smoother than coffee, with less of a sharp spike and crash. This is partly because yerba mate contains other naturally occurring compounds in the leaf that may slow the absorption of caffeine slightly, though the tea bag format delivers less of these compounds than a traditional gourd preparation.
How Many Cups You Can Safely Drink
The FDA considers up to 400 milligrams of caffeine per day safe for most adults. At the typical tea bag level of 30 to 40 mg per cup, that’s roughly 10 cups before you’d approach that ceiling. Even at the higher end of 60 mg per cup, you’d need about 6 to 7 cups to reach 400 mg. For most people, caffeine from yerba mate tea bags is unlikely to be a concern unless you’re also drinking coffee, energy drinks, or other caffeinated beverages throughout the day.
Why Brands Vary
Not all yerba mate tea bags are created equal. The caffeine content shifts based on the amount of leaf packed into each bag (typically 1.5 to 2 grams), the cut of the leaf, and whether the blend includes stems, which contain less caffeine than pure leaf. Some brands add other ingredients like mint, citrus peel, or green tea, which dilute the yerba mate content and lower the caffeine per bag. Brands that use pure, finely cut leaf in a fuller bag will sit at the higher end of the range.
If a brand lists caffeine on the packaging, use that number. If it doesn’t, assume somewhere around 30 to 40 mg for a 5-minute steep in hot water. That’s the safest middle estimate for a standard commercial tea bag.