Decaf Coffee: Caffeine Content, Benefits and Sleep (UK)

Last updated: October 2026

Decaf coffee still contains a little caffeine, usually a few milligrams a cup (the British Heart Foundation puts it at around 7mg) compared with about 100mg in a cup of instant coffee. It keeps much of coffee’s flavour and plant compounds. For most people an evening cup is unlikely to affect sleep, though very sensitive people may notice it.

Below: how much caffeine is in decaf, how it’s made, decaf vs regular coffee, whether it’s good for you, and what it means for sleep, reflux, pregnancy and children.

How much caffeine is in decaf coffee?

Decaf is low in caffeine, not free of it. Decaffeination typically leaves around 1 to 2% of the original caffeine in the bean, and the exact amount in your cup depends on the beans, the method and how strong the drink is.

Drink	Approximate caffeine
Cup of instant coffee	100mg (NHS)
Filter or coffee-shop coffee	Often more than 100mg (NHS)
Cup of decaf coffee (200ml)	Around 7mg (British Heart Foundation)
Large coffee-shop decaf (16oz, about 470ml)	0 to 14mg in one laboratory study
Decaf espresso shot	About 3 to 16mg in the same study
Cup of decaf tea (200ml)	Around 2mg (British Heart Foundation)

The laboratory study tested decaf drinks from ten different coffee shops and found that even the same drink from the same outlet varied. So one decaf is nothing to worry about for most adults, but five large decafs a day add up, and they aren’t suitable if a doctor has told you to avoid caffeine completely.

There is a legal line for instant coffee: in England, a coffee extract can only be labelled “decaffeinated” if caffeine makes up no more than 0.3% of its coffee-based dry matter. For a full breakdown of caffeine in everyday drinks, see how long caffeine lasts.

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How decaf coffee is made

Caffeine is taken out of green (unroasted) coffee beans before they are roasted. There are three main methods:

Water process (sometimes sold as “Swiss Water”): green beans soak in water that is already full of coffee’s other soluble compounds, so mainly caffeine moves out. The water is then filtered through carbon to catch the caffeine and reused. Flavour loss is small.
Carbon dioxide (CO2) process: steamed beans sit in a pressurised vessel with carbon dioxide, which is very selective for caffeine and strips fewer flavour molecules than solvents.
Solvent process: the beans are treated with a permitted food solvent, most often ethyl acetate or dichloromethane, which is then removed and recycled.

Solvents are tightly regulated. UK rules list the solvents allowed for decaffeinating coffee and cap what can remain, for example no more than 2mg of dichloromethane per kg of roasted coffee. If you’d rather avoid solvents altogether, look for “water process” or “CO2” on the pack.

Decaffeination doesn’t strip everything else out. In one study, CO2 decaffeination left coffee’s main chlorogenic acids, the plant compounds coffee is best known for, largely unchanged, while trigonelline fell slightly.

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Decaf vs regular coffee

	Regular coffee	Decaf coffee
Caffeine	About 100mg in instant, often more in filter and coffee-shop drinks	A few milligrams a cup, occasionally up to about 15mg in a large drink
Acid reflux	Coffee is a common heartburn trigger	Still coffee, so it can still trigger symptoms in some people
Taste	Full coffee flavour	Close; some flavour can be lost, less so with water and CO2 methods
Sleep	The NHS advises no coffee in the 6 hours before bed if you struggle to sleep	Unlikely to affect most people in the evening
Jitters and palpitations	Possible if you’re sensitive or have a lot	Far less likely
Pregnancy	Counts towards the 200mg a day limit	Counts a little

If coffee makes you shaky or wired, see does caffeine cause anxiety? and why you get a coffee crash.

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Is decaf coffee good for you?

For most adults decaf is a perfectly reasonable everyday drink. Taken plain or with a splash of milk, it’s low in calories, and the NHS counts tea and coffee towards your daily fluid intake, so it isn’t dehydrating in normal amounts (see how much water to drink).

What about the headlines on coffee and long life? Here is the honest picture:

A large 2017 review of more than 200 meta-analyses found coffee drinking was more often linked with benefit than harm, with the strongest associations at three to four cups a day. Almost all the evidence was observational.
Some studies look at decaf separately. In a pooled analysis of 28 studies, people who drank more decaf were slightly less likely to develop type 2 diabetes, and in UK Biobank, people drinking 2 to 3 cups of decaf a day had lower death rates over 12 years than non-coffee drinkers.
In the same UK Biobank study, regular coffee but not decaf was linked with fewer heart rhythm problems.

Studies like these show links, not cause and effect. Coffee drinkers may differ from non-drinkers in many other ways. So drink decaf because you enjoy it, not as a health measure. Decaf isn’t a treatment for diabetes or any other condition; if you have diabetes, the bigger issue is usually sugar and syrups in café drinks, and your diabetes team can advise.

Decaf is also a gentler choice if regular coffee gives you a racing heart. The British Heart Foundation suggests it if caffeine leaves you jittery or with palpitations. See heart palpitations at night and eye twitching.

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Will decaf coffee affect your sleep?

Probably not, for most people. EFSA, the European food safety body, notes that around 100mg of caffeine close to bedtime may affect sleep in some adults. A typical decaf has a small fraction of that.

Caffeine lingers in your body for hours, so what you drink in the afternoon can still be around at bedtime (see how long caffeine stays in your system). That’s why switching your afternoon and evening cups to decaf is one of the easiest ways to cut caffeine without giving up the ritual. The NHS advice for people with insomnia is no tea or coffee at least 6 hours before bed, so if you sleep badly and you’re very sensitive, try a week without even decaf in the evening and see if it makes a difference.

A warm drink can be a nice cue to wind down. See our bedtime routine for adults and best teas for sleep, and if a nightcap is your evening habit, read alcohol and sleep.

If you’d like a cosy evening drink that isn’t coffee, our Reishi Mushroom Adaptogenic Complex is a reishi hot chocolate made with reishi mushroom extract, organic cacao, maca, coconut milk powder and coconut sugar. Cacao contains a little natural caffeine, so it isn’t caffeine-free; if you’re very sensitive, have it earlier in the evening.

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Is decaf coffee better for acid reflux?

The NHS lists coffee among foods and drinks that can trigger heartburn and acid reflux. Some people find decaf easier, but it is still coffee, so it isn’t trigger-free for everyone. Keep a simple diary to see what sets you off, avoid drinking it on an empty stomach if that’s worse for you (see coffee on an empty stomach), and see a GP if you have heartburn most days, pharmacy medicines aren’t helping, food gets stuck when you swallow or you’re losing weight without trying.

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Can you drink decaf coffee when pregnant?

The NHS advises no more than 200mg of caffeine a day in pregnancy, about two cups of instant coffee. Decaf counts towards that total, but only by a few milligrams a cup, so many people switch to it. Remember that tea, cola, energy drinks and chocolate count too. If you’re unsure, ask your midwife. We don’t recommend our products during pregnancy or breastfeeding.

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Can children drink decaf coffee?

Decaf has very little caffeine, but it isn’t a drink children need. EFSA suggests children and teenagers keep caffeine to no more than 3mg per kg of body weight a day, and the NHS says water and milk are the best drinks for children. An occasional milky decaf is unlikely to matter, but watch the sugar, syrups and the temperature of hot drinks. Our products are for adults only.

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Beans, pods and instant: choosing decaf

Check the method. Many packs say “water process” or “CO2”. If it doesn’t say, a solvent method was probably used, which is legal and regulated.
Pods and sachets are widely available in UK supermarkets and are handy for an evening cup.
Instant decaf has a legal caffeine limit, so it’s a predictable choice.
In coffee shops, decaf espresso shots ranged from about 3 to 16mg in one study, so if you’re very sensitive, stick to one shot.
Half-caff (half regular, half decaf) is a good halfway step if you’re cutting down slowly.

Want to skip coffee altogether? See coffee alternatives, matcha (which does contain caffeine) and mushroom coffee, or read about CBD coffee.

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FAQs

Does decaf coffee have caffeine?

Yes, a little. A cup of decaf usually has a few milligrams, around 7mg in a 200ml cup according to the British Heart Foundation, compared with about 100mg in a cup of instant coffee.

Is decaf coffee bad for you?

No. For most adults decaf is a perfectly reasonable everyday drink. Solvents used in some decaffeination methods are tightly regulated, and you can choose water-process or CO2 decaf if you prefer.

Will decaf coffee keep me awake?

Unlikely for most people, because it has only a few milligrams of caffeine. If you have insomnia or you’re very sensitive, try avoiding even decaf in the late evening for a week and see if it helps.

Is decaf coffee dehydrating?

No. The NHS counts tea and coffee towards your daily fluid intake.

Is decaf coffee better for acid reflux?

Some people find it easier, but coffee is a common reflux trigger and decaf is still coffee. Keep a diary of what sets you off and see a GP if you have heartburn most days.

Can I drink decaf coffee when pregnant?

Usually, yes. The NHS advises no more than 200mg of caffeine a day in pregnancy, and decaf adds only a few milligrams a cup. Ask your midwife if you’re unsure.

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