The tea world's most repeated myth: green tea has less caffeine than black. The leaf says otherwise — green and black from the same plant carry similar caffeine per gram. What differs is how we brew them, and steeping decisions move caffeine more than leaf choice does.
The extraction math
Caffeine is highly water-soluble and extracts fast — but not instantly. A 30-second steep pulls perhaps a third of the leaf's caffeine; a 5-minute steep pulls most of it. A quick-steeped gyokuro (high-caffeine leaf, cool water, 90 seconds) can deliver less caffeine than a long-steeped chamomile-adjacent white. Steep time and leaf dose dominate; category labels are noise.
Typical ranges per 8 oz cup
| Tea | Typical caffeine | Range drivers |
|---|---|---|
| Matcha (full bowl) | ~70 mg | Whole leaf consumed |
| Assam / breakfast | 40–50 mg | Long steep, broken leaf |
| Raw puerh | 35–50 mg | Young leaf, many infusions |
| Sencha / greens | 25–35 mg | Short steeps, cooler water |
| Silver Needle | 15–25 mg | Buds, gentle steeps |
| Herbal tisanes | 0 mg | No camellia leaf at all |
Controlling caffeine honestly
- Shorten the steep. A 60-second green delivers roughly a third of a 3-minute steep's caffeine — the simplest lever.
- Use less leaf. Linear and honest.
- "Rinse to decaffeinate" is a myth: a 30-second rinse removes some caffeine but also the flavor — and far less caffeine than claimed. Skip the ritual, brew shorter instead.
- Evening: the herbal shelf (rooibos, chamomile, peppermint) exists for exactly this — zero camellia, zero caffeine.
Count your cups against your own limits, steep shorter as the day goes later, and let the database's caffeine column be the start of the conversation — your steeping habits are the rest of it.