How Much Caffeine Is in Tetley Tea? (mg per Bag, by Blend)

Every figure below is published by Tetley itself. Where Tetley's own sites disagree, we show both, because the difference is real: it reflects cup size and which blend each market sells.

For an American reader buying Tetley in a US store, the Tetley USA figure of 50 mg per cup of black tea is the one to use. It sits right alongside the USDA FoodData Central value for brewed black tea (20 mg per 100 g, about 47 mg in an 8 fl oz cup), so there is nothing unusual about Tetley: it is a normal, fully caffeinated black tea.

Tetley's figures are per cup, and one bag makes one cup, so a single Tetley black tea bag gives you roughly 30 to 50 mg of caffeine depending on how long you steep it, with Tetley USA citing 50 mg as its standard cup. The caffeine is in the leaf, not the water, so the bag sets the ceiling: a second cup from the same bag will be much weaker, and two bags in one mug roughly doubles the dose.

Tetley also explains why the range exists: its global FAQ says the caffeine released in the first minute is the highest and then gradually diminishes. In practice a quick 1 to 2 minute dunk already delivers a large share of the caffeine, and a longer steep keeps adding some, but at a slowing rate.

Tetley does not publish a separate milligram figure for British Blend. It is Tetley's best-known US black tea, a blend of Kenyan and Assam teas according to Tetley USA's product page, so the Tetley USA black tea figure of 50 mg per cup is the best official number to use for it. That puts British Blend at the upper end of Tetley's 30 to 50 mg global range, which fits a blend Tetley describes as full-bodied, rich, and invigorating.

If you want the British Blend taste with less caffeine, Tetley sells a British Blend Decaf, which falls under Tetley's decaf figure of a maximum 10 mg per cup. Our Tetley British Blend review covers the flavor, the bags, and the best pack size to buy.

No. Tetley USA itself describes its 50 mg black tea cup as about half the caffeine of a cup of coffee, and USDA FoodData Central lists 8 fl oz of brewed coffee at about 95 mg. Against the FDA's published guidance that up to 400 mg a day is not generally associated with negative effects for healthy adults, that is room for roughly eight cups of Tetley black tea. Caffeine sensitivity is individual, and pregnant readers should ask their doctor about limits; this page is not medical advice.

For the same comparison across other brands, see our caffeine by tea bag brand table, and for tea types in general, the tea caffeine chart.

For less: steep for 1 to 2 minutes, use water just off the boil rather than rolling, or switch to Tetley decaf in the evening. For more: a 4 to 5 minute steep reaches the top of Tetley's range, and a stronger blend like Tetley Irish Breakfast is the obvious pick. Adding milk or sugar changes the taste, not the caffeine. Iced Tetley made with one bag per cup carries the same caffeine as hot; a pitcher made with fewer bags per cup carries less.