How Much Caffeine Is in Oolong Tea?
Oolong is semi-oxidized tea — anywhere from 10% to 80% oxidation. That range drives the caffeine spread: lightly oxidized floral oolongs sit around 30 mg per 8 oz, while darker, more roasted styles can reach 50 mg.
About 40 mg per cup, with a wide range by oxidation level.
How it compares
Oolong sits between green and black tea on caffeine — same Camellia sinensis plant, different processing. Because oolong is usually steeped multiple times (gongfu style), your total caffeine across a session can match a cup of coffee.
| Drink | Caffeine (mg) |
|---|---|
| Oolong (8 oz, first steep) | 40 |
| Oolong (4-steep gongfu session) | 95 |
| Green tea (8 oz) | 30 |
| Black tea (8 oz) | 50 |
| Brewed drip coffee (8 oz) | 95 |
Our picks on Amazon
Premium Fujian oolong tea. Semi-oxidized for complex flavor. Traditional Chinese tea with health benefits.
Premium high altitude oolong tea from Taiwan. Smooth, floral, buttery flavor. Hand-picked leaves from mountain peaks.
Frequently asked
Does dark oolong have more caffeine than green oolong?
Slightly. More oxidation and roasting concentrate the remaining caffeine, though the differences are smaller than the differences between tea types.
Can I drink oolong before bed?
It depends on your sensitivity. A single 8 oz cup has about 40 mg — similar to a small coffee. Most people switch to hojicha, barley tea, or tulsi for late evening.