What Is Half Caff Coffee? (And When It Makes More Sense Than Going Full Decaf)
Half caff coffee is a 50/50 blend of regular and decaffeinated coffee beans. That's the whole concept. You get roughly half the caffeine of a standard cup, usually somewhere between 30 and 50mg per espresso shot, depending on the beans and how you brew, and the taste stays more or less identical to whatever coffee you started with.
Most coffee brands offer regular or decaf and nothing in between. Half caff sits in the gap that most roasters don't bother filling, which is a shame, because for a lot of coffee drinkers it's actually the most sensible option.
How Much Caffeine Is in Half Caff Coffee?
The short answer: about half of whatever you'd normally be drinking.
A standard espresso shot contains roughly 63–95mg of caffeine, depending on the bean, the dose, and how it's extracted. Half caff brings that down to approximately 30–50mg per shot. For context, a cup of tea sits at around 40–50mg, so a half caff espresso is in that territory. Noticeably less than regular coffee, but not nothing.
Full decaf, particularly Swiss Water processed decaf, comes in at around 2–5mg per cup. Effectively zero for most purposes.
The NHS recommends staying under 200mg of total daily caffeine during pregnancy. A half caff espresso fits comfortably within that, even at two cups, particularly if you're keeping an eye on tea, chocolate, and other caffeine sources across the day.
One thing worth knowing: the caffeine level isn't fixed. Robusta beans have roughly double the caffeine of arabica, so a half caff blend using robusta in the caffeinated component will have a higher caffeine content than one built on arabica. The ratio matters too; not every half caff is a precise 50/50. And brew method makes a difference. A long drip brew or a strong French press will extract more caffeine than a quick espresso pull. The figures above are a reasonable guide, not a guarantee.
Who Actually Drinks Half Caff Coffee?
Half caff has a slightly niche reputation, the sort of thing you'd see on a US diner menu without quite knowing who orders it. But there are some genuinely good reasons to choose it.
The most common one is stepping down from regular coffee without going cold turkey. Caffeine dependence is real. Cut it out abruptly and you'll know about it: headaches, fatigue, a general greyness that tends to arrive around mid-morning and refuse to leave. Half caff lets you reduce caffeine consumption gradually: same routine, same volume, roughly half the caffeine intake. Do that for a few weeks, and if you want to go further, switch to full decaf from there. It's a gentler reduction than quitting in one move.
The other big use case is afternoon coffee. Caffeine has a half-life of around five to six hours in most adults, which means a standard espresso at 3pm still has meaningful caffeine in your system at 8 or 9pm. For people who are sensitive to this, and more people are than realise it, a late caffeinated coffee quietly disrupts sleep without ever obviously feeling like the cause. Half caff halves that effect without removing the ritual. You still make a proper coffee at 3pm. You just sleep better afterwards.
There are also people who sit somewhere between caffeine-sensitive and caffeine-free; regular coffee at normal strength triggers anxiety or an elevated heart rate, but full decaf feels flat or unsatisfying in a way they can't quite explain. Half caff is often a useful answer there. Lower caffeine level, same coffee flavour, no need to drink something labelled decaf if that feels like a psychological step too far.
For pregnancy and breastfeeding, the NHS guidance is a maximum of 200mg of total daily caffeine from all sources. A half caff espresso contains around 30–50mg, which leaves plenty of room for tea, a bit of dark chocolate, whatever else comes in across the day. That said, everyone's pregnancy is different, so check with your GP or midwife for advice specific to your situation, rather than relying on what it says on a coffee bag.
Does Half Caff Taste Different to Regular Coffee?
This is the question that actually matters to most people. The honest answer: with a well-made blend, you probably won't notice.
Coffee's flavour comes from hundreds of chemical compounds in the bean; the stuff that creates sweetness, acidity, body, aroma. Most of it survives the decaffeination process intact. The caffeine molecule itself doesn't do much for taste. Remove it carefully and what's left still tastes like coffee.
The problem is that "carefully" varies a lot depending on how the decaf was made. A low-quality decaffeinated bean, one processed aggressively with chemical solvents, brings a flatness to the cup, sometimes a slightly hollow or chemical aftertaste, even when it's only half the blend. That's what puts coffee lovers off half caff blends. They've tried one built on a bad decaf and written the whole category off, which is understandable but not the full picture.
Swiss Water processed decaf doesn't have that problem. The process uses water and carbon filtration, no solvents, and preserves the bean's original character, the origin notes, the sweetness, the body. Blend it with the regular version of the same bean and the cup tastes like the coffee, not like a reduced version of it.
The one thing very attentive drinkers might notice is a marginally lighter mouthfeel. Decaffeinated beans are slightly more porous than regular coffee beans, which can affect body and texture at the edges. In a 50/50 blend, most people won't pick this up unless they're actively looking for it. Speciality coffee drinkers who pay close attention to process tend to be more sensitive to it. For everyone else, the difference is minimal.
Pre-Blended vs Blending Your Own at Home
You can make half caff yourself at home. Keep two bags, one regular, one decaf, and dose equal weights from each before grinding. If you're using a drip brew machine, a cafetière, or a French press, pour roughly equal volumes into your coffee maker and brew as normal. It works fine.
The limitation is consistency, particularly on espresso. Two different coffees have different bean densities, different roast levels, and different grind behaviours. Mix a light Ethiopian Yirgacheffe with a dark Sumatra Mandheling decaf and you've got two coffees that want to be ground at different settings, extracted at different temperatures, and brewed for different lengths of time. On a French press that's forgiving enough not to matter. On an espresso machine, pairing a Costa Rica coffee with a mismatched decaf bean can make dialling in genuinely awkward; you're looking for one grind setting that works for two beans that have different opinions about what that should be.
A pre-blended bag solves this. The best half caff blends match the bean origin type across both components, or at least get close on roast level and grind behaviour. The result extracts predictably, dials in like a single coffee, and tastes the same from cup to cup.
Brazil coffee is a common base for half caff blends for exactly this reason, forgiving on the grinder, low acidity, full body, holds up well through the decaffeination process. Peru is another solid choice. Chocolatey, full-bodied arabica origins tend to retain their character through Swiss Water processing better than more delicate ones, which makes them sensible picks for the decaffeinated half of a blend.
How to Brew Half Caff Coffee
There's nothing special about it. Treat half caff exactly like regular coffee in whatever brew method you use.
Espresso: Start at your normal recipe. The decaf component is slightly more porous than regular coffee beans, so you may need to go a touch coarser to avoid over-extraction. Pull a shot at your normal setting first, taste it, and adjust from there. In most cases it's a small move, not a major recalibration.
Cafetière or French press: Coarse grind, four-minute steep, slow plunge. No changes needed.
Filter and drip brew: Same as regular. Medium grind, your usual ratio. A V60 or Aeropress works identically.
Bean-to-cup machines: Should run without changes on most machines. If the output seems thin, nudge the internal grinder slightly finer.
Simmer Down 50% Decaf
Most half caff coffee on the UK market is built from unmatched components: a caffeinated roast pulled from one origin, a decaffeinated bean from somewhere entirely different, blended together because the numbers work out. The flavour is inconsistent and the grind behaviour is awkward.
Simmer Down 50% does it differently. Both the regular and the decaffeinated beans are the same single origin: Cajamarca, Peru. Bourbon and Typica varietals, washed process, medium roast. The decaf half uses the Swiss Water method, no chemical solvents, 99.9% caffeine removed from the green coffee beans before roasting. Because the two components come from the same origin and the same roast profile, the grind behaviour is matched and the cup is consistent.
Vanilla fudge, caramelised biscuit, smooth body. Great Taste awarded, and for what it's worth, the judges scored it without knowing it was a half caff blend. Lab-tested for mycotoxins, moulds, and artificial pesticides, the same as every coffee in our Roastery Collection. Organic and Fairtrade certified. Available as whole beans or pre-ground for espresso, cafetière, filter, or Aeropress.
From £16.95. Roasted to order, same-day dispatch, free next-day delivery over £15.
Frequently Asked Questions
What is half caff coffee?
Half caff coffee is a blend of regular and decaffeinated coffee beans, typically in equal parts. It contains roughly half the caffeine of a standard cup, around 30–50mg per espresso shot compared to 63–95mg in a regular one. The taste is the same as normal coffee and it brews the same way.
How much caffeine is in half caff coffee?
Around 30–50mg per espresso shot, depending on the bean, the dose, and the brewing method. A regular espresso contains roughly 63–95mg; full decaf comes in at around 2–5mg per cup. Half caff sits comfortably within the NHS recommended limit of 200mg per day, even at two cups, as long as you're counting caffeine from other sources across the day too.
Is half caff better than decaf?
Depends what you need it for. If you're avoiding caffeine entirely, late-night drinking, medical reasons, or high sensitivity, full decaf is the right call. If you want to cut back without quitting, half caff is usually the better fit. It avoids the withdrawal effects that come from dropping caffeine abruptly, and the flavour is closer to what most people are used to from a regular cup.
Is half caff coffee safe during pregnancy?
Generally yes, within the NHS limit of 200mg of total daily caffeine from all sources. A half caff espresso contains around 30–50mg, which leaves room for tea, chocolate, and other caffeine in the day. For advice specific to your pregnancy, speak to your GP or midwife. This is a sensible starting point, not a substitute for that conversation.
Does half caff taste different to regular coffee?
With a quality blend, most people can't tell. The key is the decaf component; Swiss Water processed decaf preserves the bean's original character, so the blend tastes like coffee rather than a diluted version of it. The only difference some drinkers notice is a slightly lighter body, because decaf beans are more porous. In a 50/50 blend, most people won't catch it.
Can I make half caff coffee at home without a pre-blended bag?
Yes, weigh equal doses from a regular bag and a decaf bag before grinding. The practical issue is that two different coffees grind and extract differently, which makes espresso harder to dial in. A pre-blended bag uses matched beans from the same origin and roast, so the grind behaviour is consistent and extraction is predictable.
What is the best half caff coffee in the UK?
We're not exactly neutral here. But regardless of brand, look for a pre-blended half caff that uses a Swiss Water processed decaf with both components from the same or closely matched origin. That combination gives you consistent extraction and a clean cup, none of the flatness that comes through when a poor-quality decaf drags the blend down. Speciality coffee roasters who apply the same sourcing standards to their decaf as to their regular offering are generally the ones worth buying from.
