Caffeine & Sleep
Coffee

Caffeine in Decaf Coffee

3mg
per 8 oz
1% of FDA daily max

Is that a lot?

Decaf Coffee is 1% of the FDA’s recommended daily maximum, in a single 8 oz.

Decaf Coffee
3 mg
Green tea
28 mg
Espresso
63 mg
Red Bull
80 mg
Coffee
95 mg
FDA daily max · 400mg
Before bed

When can I drink Decaf Coffee and still sleep?

Your Decaf Coffee cutoff
You drink it at
Bedtime
Decaf Coffee · 3 mg · assuming an average ~5 h half-life
At bedtime
1 mg
close to optimal
Latest safe Decaf Coffee: 11:00 PM

How much caffeine is in Decaf Coffee?

Decaf isn't caffeine-free, but it's close, an 8 oz cup holds only about 3 mg, a trace next to regular coffee's 95. You'd need dozens of cups to match a single ordinary brew.

ServingCaffeineSugar
8 oz3 mg0 g

Not caffeine-free; ~2–5 mg/8oz.

Will Decaf Coffee affect your sleep?

At roughly 3 mg, decaf is already far below the 50 mg sleep-threshold, so it has essentially no effect on bedtime. It's a safe way to enjoy a warm cup in the evening.

Source: USDA FoodData Central; FDA

Related drinks

Decaf Coffee & sleep — FAQ

No, with only about 3 mg per cup, decaf sits far under the 50 mg threshold and won't keep you up, even right before bed.

Decaf Coffee has 3 mg per 8 oz — about 1% of the FDA’s 400 mg daily maximum for healthy adults.

It depends on your bedtime and how fast you clear caffeine. Use the calculator above to see when Decaf Coffee drops below the ~50 mg “ok to sleep” threshold for your bedtime.

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