How many cups of coffee per day is safe?

For a healthy adult, the European Food Safety Authority (EFSA) sets the daily ceiling at 400 mg of caffeine — roughly 4 to 5 espressos, 3 to 4 standard 200 ml filter cups, or 5 to 6 home brews. During pregnancy and breastfeeding the advised limit drops to 200 mg per day from all sources combined.

The 400 mg daily threshold comes from the EFSA Scientific Opinion published in 2015, still the European reference. Above that level, the probability of unwanted effects — poor sleep, anxiety, palpitations, a transient rise in blood pressure — increases in a statistically measurable way. EFSA also advises not to exceed 200 mg in a single sitting, to avoid uncomfortable plasma peaks. The US FDA endorses the same daily limit for healthy adults, and recent meta-analyses (BMJ, 2017; Annual Review of Nutrition, 2017) suggest that a habitual 3-5 cups per day sits in the sweetest benefit-to-risk ratio for all-cause mortality.

Translating the ceiling into cups depends heavily on method. At ~63 mg for a traditional Italian espresso, you could pull 6 before crossing 400 mg — but only 3 if your specialty double clocks 130 mg. A 200 ml Belgian filter coffee (~150 mg) tops out at 2-3 cups per day if coffee is the only source, 2 if you also drink black tea, a soda, and eat dark chocolate. The frequent oversight is forgetting that caffeine = coffee + tea + energy drinks + cola + cocoa + certain medications (paracetamol-caffeine, some migraine treatments).

Two groups need tighter guardrails. Pregnant and breastfeeding women: EFSA and the WHO recommend a ceiling of 200 mg/day, because caffeine crosses the placenta and the foetus hardly metabolises it — the half-life reaches 80 hours in a newborn. Children and adolescents: EFSA caps intake at 3 mg/kg/day, which means ~120 mg for a 40 kg teenager, already reached with one Red Bull and a square of dark chocolate. People on medication (CYP1A2 inhibitors, some antibiotics, theophylline, MAOI antidepressants) should raise the topic with their prescribing clinician.

In practice, a stable Walloon Brabant pattern might look like: one morning espresso, one lunchtime filter, one decaf after 3 p.m. — around 230 mg, well below the ceiling and usually kind to sleep. On a heavy morning you could add a second espresso without crossing 400 mg. This FAQ is not a substitute for personal medical advice; for any cardiac, renal, hepatic or pregnancy-related condition, please consult a healthcare professional.

EFSA 400 mg/day: how many cups?

Population-level safety and individual sensitivity

The European Food Safety Authority's 2015 safety assessment of caffeine — the most comprehensive regulatory review of caffeine safety in food contexts — established habitual caffeine intakes of up to 400 mg/day as safe for non-pregnant healthy adults, with single doses up to 200 mg not associated with safety concerns. This 400 mg/day limit translates to approximately 4–5 standard espressos, 3–4 large filter coffees, or 6–8 small filter coffees depending on preparation strength. The safety threshold is derived from no-observed-adverse-effect-level (NOAEL) analyses across studies of cardiovascular, skeletal, behavioural and reproductive endpoints — it represents the dose below which the weight of evidence finds no meaningful safety concern in the general adult population.

Individual cups are inconsistently sized, which creates ambiguity in 'cups per day' recommendations. A 'cup' in EFSA's assessment refers to a standardised reference unit containing approximately 90 mg caffeine — roughly equivalent to a small filter coffee or a ristretto. An actual home filter coffee pot serving might contain 120–180 mg depending on the machine, dose and coffee strength. A specialty espresso double shot contains 120–140 mg. A Nordic brewed coffee in a large cup might contain 200+ mg. Translating 'safe to 400 mg/day' into practical cup count requires knowing your actual caffeine per cup — which varies by 3-fold between preparation styles. The safest practical guidance: know your brewing method's caffeine output (most are published in the scientific literature and in specialty coffee resources) and sum rather than count.

Going deeper

Vulnerable populations have lower safe intake thresholds that the general 400 mg/day guidance doesn't apply to. Pregnant women: below 200 mg/day (EFSA recommendation). Children and adolescents: 3 mg/kg body weight (a 40 kg 12-year-old should not exceed 120 mg/day). People with anxiety disorders, cardiac arrhythmias or insomnia: individual thresholds vary and clinical guidance should be sought. People taking CYP1A2-inhibiting medications: effective caffeine dose is higher than the dose consumed, so the safety threshold in caffeine equivalents is effectively lower. The 400 mg/day recommendation, properly applied, serves as a starting point for general population guidance and requires downward adjustment for all vulnerable subgroups — making personalisation the essential supplement to any population-level safety number.