Decaf
Does decaf have caffeine?
Short answer: yes, a little — but far less than regular coffee. "Decaf" means decaffeinated, not caffeine-free. Here's exactly how much, and the handful of situations where it matters.
The numbers
| Drink | Caffeine (8-oz cup) |
|---|---|
| Regular coffee | ~95 mg |
| Decaf coffee | ~2–5 mg |
| Cup of decaf vs one regular | ~3–5% as much |
To be labeled decaf in the US, at least 97% of its caffeine must be removed; the EU requires it down to 0.1% by weight.1 So a typical cup lands around 2–5 mg — a trace.
When the trace actually matters
- Almost never, for sleep. 2–5 mg is far below the level that affects most people's sleep. If decaf seems to wake you up, here's the real reason — and it isn't the caffeine.
- Heavy decaf drinkers. Several cups can accumulate a detectable amount of caffeine in your bloodstream — but at roughly 2–5 mg each, even five or six cups (~10–30 mg) stay well under one regular cup. This typically only matters if you're unusually sensitive.
- Pregnancy / medical limits. If you're counting every milligram, decaf isn't zero. Follow clinician guidance on your daily total.
The part decaf doesn't solve
Cutting caffeine to a trace is exactly why people choose decaf — and also why it can feel flat. Remove the caffeine and you remove the lift. If what you want is the alertness without the caffeine cost, that's a different approach: paraxanthine (Px).
Common questions
How much caffeine is in a cup of decaf?
About 2–5 mg per 8-oz cup, compared with roughly 95 mg in regular coffee. The exact amount varies by bean, roast, and brewing method, but it is always a small fraction of caffeinated coffee.
Is decaf caffeine-free?
No — "decaffeinated" means most of the caffeine is removed, not all of it. To be labeled decaf in the US, at least 97% must be removed; the EU caps it at 0.1% by weight. There is no such thing as truly 0 mg decaf coffee.
Is decaf safe during pregnancy?
Decaf is very low in caffeine, which is why many people choose it during pregnancy. Because it is not zero, follow your clinician guidance on total daily caffeine — this page is information, not medical advice.
Will decaf keep me awake?
For nearly everyone, the trace caffeine in decaf is too small to affect sleep. If decaf seems to wake you up, that is mostly the ritual and expectation, not the caffeine.
* These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Content on this page is informational and not a substitute for medical advice; talk to a clinician about caffeine and your health.
- Decaf caffeine threshold — the US "at least 97% removed" figure is the widely-cited industry / labeling standard (National Coffee Association), not a codified federal rule (the only codified US rule governs solvent residue, 21 CFR 173.255). Per-cup residual (~2–5 mg): FDA, "Spilling the Beans." EU cap ≤0.1% by weight: Directive 1999/4/EC.
Keep going: how decaf is made · why decaf still wakes you up · caffeine and sleep