Is coffee safe during pregnancy?
Safe in moderation — 200mg of caffeine a day (300mg in Canada)
Yes, up to 200mg of caffeine a day. That is roughly two cups of instant coffee, or one large coffee-shop filter coffee. The NHS and the American College of Obstetricians and Gynecologists set the same 200mg ceiling. Health Canada is more permissive, at 300mg a day.
The verdict
Coffee is safe during pregnancy in moderation. The limit almost everywhere is 200mg of caffeine a day from all sources combined - not 200mg of coffee, and not two cups of anything. Two cups of instant coffee take you to roughly 200mg. One large filter coffee from a high-street chain can get you there on its own.
You do not have to give up coffee. You do have to count it.
Why caffeine is limited
Caffeine crosses the placenta freely. A developing baby has very limited ability to break it down, and the pregnant body clears caffeine progressively more slowly as pregnancy advances - by the third trimester the half-life is several times longer than it was before pregnancy. The same cup therefore produces a longer exposure than it used to.
What that exposure does at everyday intakes is genuinely contested, and the guidance bodies say so in different ways. The NHS states plainly that having too much caffeine has been linked to a higher chance of miscarriage and stillbirth. NICE, in its Clinical Knowledge Summary for uncomplicated antenatal care, gives low birth weight as the reason for the 200mg cap. ACOG's Committee Opinion 462, reaffirmed in 2026, is more cautious in the other direction: moderate caffeine consumption below 200mg a day does not appear to be a major contributing factor in miscarriage or preterm birth, and the relationship to growth restriction remains undetermined.
Those are not quite contradictions. They are different framings of the same uncertainty. Below 200mg, no body has found a clear signal. Above it, the evidence is mixed and the agencies would rather you did not find out.
How much is in what you are drinking
The NHS publishes these estimates:
- 100mg in a cup of instant coffee - filter coffee and coffee bought from coffee shops can contain more
- 75mg in a cup of tea, black or green
- 40mg in a can of cola
- 80mg in a 250ml can of energy drink
- less than 25mg in a 50g bar of plain dark chocolate
- less than 10mg in a 50g bar of plain milk chocolate
NICE still publishes a figure the NHS consumer page has dropped: one mug of filter coffee contains 140mg of caffeine. That number matters, because a medium filter coffee plus a single cup of tea already sits at 215mg.
The coffee-shop problem
Chain coffee is not a standard cup. A large filter or americano is typically two or three espresso shots in a bigger volume, and the NHS explicitly flags that shop-bought coffee can contain more than its 100mg instant estimate. If you drink one a day and nothing else caffeinated, you are probably fine. If you drink one a day plus tea, you are probably over.
Decaffeinated coffee is not caffeine-free but is close enough that no authority counts it against the limit.
If you have already had more than 200mg
A single day over the limit is not a recognised risk event, and no guidance body treats it as one. The 200mg figure is a daily average intended to shape a habit across nine months, not a threshold that triggers harm the moment you cross it. There is nothing to do retrospectively and nothing to test for.
The practical response is to look at where the caffeine is coming from and cut the largest source. For most people that is the second coffee of the day, not the tea or the chocolate. Cutting abruptly can cause headaches; tapering over a week or so avoids that.
If you are drinking caffeine in the region of 500mg a day or more, mention it at your next midwife or antenatal appointment - not because a specific intervention follows, but because it is worth having on the record alongside everything else being reviewed.
Where the guidance genuinely differs
This is one of the more aligned topics on the site, with one real exception.
The UK and the US agree exactly. The NHS says no more than 200mg a day. ACOG's Committee Opinion 462 uses the same figure. NICE repeats it for clinicians. If you are reading conflicting advice between UK and US sources on caffeine, one of them is out of date.
Canada sets a higher ceiling. Health Canada's maximum recommended daily caffeine intake for people who are pregnant is 300mg - the same figure it applies to breastfeeding and to people planning a pregnancy. That is a 50% higher allowance than the UK and US figure, from a national regulator, published in the same year. Nobody has reconciled it. Health Canada also assumes a lower caffeine content per cup than the NHS does, which widens the practical gap further: it puts brewed coffee at 135mg per 8oz cup and brewed black or green tea at 30 to 50mg, against the NHS's 75mg for any tea.
Australia has no number at all. Food Standards Australia New Zealand states that there is no recognised health-based guidance value for caffeine, such as an Acceptable Daily Intake. Its pregnancy page warns that large amounts may make conception harder and may increase the risk of miscarriage or low birth weight, but attaches no milligram figure. RANZCOG's clinical guidance does not address caffeine at all. The 200mg figure widely quoted in Australia comes from consumer health services rather than from FSANZ.
If you want a single rule that satisfies every jurisdiction, 200mg a day is it. It is the strictest published limit, and no authority anywhere suggests going lower.
The NHS advises no more than 200mg of caffeine a day from all sources, and publishes per-drink estimates: 100mg in a cup of instant coffee, 75mg in a cup of black or green tea, 40mg in a can of cola, 80mg in a 250ml energy drink. NICE's Clinical Knowledge Summary adds 140mg for a mug of filter coffee. The stated reasons are an association between high intake and miscarriage, stillbirth and low birth weight.
Showing guidance from NHS / NICE CKS — read the source.
ACOG Committee Opinion 462, Moderate Caffeine Consumption During Pregnancy, reaffirmed in 2026, concludes that moderate caffeine consumption of less than 200mg per day does not appear to be a major contributing factor in miscarriage or preterm birth, and that the relationship to growth restriction remains undetermined. The practical recommendation is the same 200mg ceiling used in the UK.
Showing guidance from ACOG Committee Opinion 462 — read the source.
Health Canada sets a higher limit than the UK or US. Its recommended maximum daily caffeine intake is 300mg for people who are pregnant, planning to become pregnant, or breastfeeding, against 400mg for other adults. Health Canada also assumes less caffeine per serving: 135mg in an 8oz cup of brewed coffee and 30 to 50mg in a cup of brewed black or green tea.
Showing guidance from Health Canada — read the source.
Food Standards Australia New Zealand publishes no pregnancy caffeine limit. It states that there is no recognised health-based guidance value for caffeine, such as an Acceptable Daily Intake, and its pregnancy page warns only that large amounts may make conception more difficult and may increase the risk of miscarriage or low birth weight. RANZCOG's clinical guidance does not address caffeine.
Showing guidance from FSANZ — read the source.
Sources
- Foods to avoid in pregnancy — NHS, accessed
- Antenatal care - uncomplicated pregnancy: Management — NICE Clinical Knowledge Summaries, accessed
- Moderate Caffeine Consumption During Pregnancy (Committee Opinion 462) — American College of Obstetricians and Gynecologists, accessed
- Caffeine in foods — Health Canada, accessed
- Caffeine — Food Standards Australia New Zealand, accessed
- Pregnancy and healthy eating — Food Standards Australia New Zealand, accessed