Tea
Caffeine in Black Tea
47mg
per 8 oz
≈ 1 Red Bull12% of FDA daily max
Is that a lot?
Black Tea is 12% of the FDA’s recommended daily maximum, in a single 8 oz.
Green tea
Black Tea
Espresso
Red Bull
Coffee
FDA daily max · 400mg
Before bed
When can I drink Black Tea and still sleep?
Your Black Tea cutoff
You drink it at
Bedtime
Black Tea · 47 mg · assuming an average ~5 h half-life
At bedtime
16 mg
close to optimal
Latest safe Black Tea: 11:00 PM
How much caffeine is in Black Tea?
A cup of black tea brings around 47 mg of caffeine, about half what a typical coffee delivers. Steep it longer and the number climbs, but it generally stays the gentler, slower cousin of coffee.
| Serving | Caffeine | Sugar |
|---|---|---|
| 8 oz | 47 mg | 0 g |
Varies ~40–70 mg with steep time.
Will Black Tea affect your sleep?
From 47 mg, black tea is already near the 50 mg threshold and falls below it within an hour or so. An afternoon cup is usually clear by night, making it a friendlier evening option than coffee.
Source: USDA FoodData Central