Heavy, average, or light — where does your period fall? Answer three quick questions and we'll give you a score and plain-English explanation of what it means.
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This tool estimates your period's heaviness from how often you change protection and how many days you bleed. Most people lose between about 30 and 80 ml of blood over a whole period — though that's notoriously hard to judge by eye.
Flow naturally varies between people and from month to month. What's most useful is noticing a change from your normal — for example, suddenly soaking through protection hourly, or bleeding much longer than usual.
This tool gives general information and estimates only — it is not medical advice. If you have concerns, speak to a healthcare professional.
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Explore the calculators →Signs of a heavy period include soaking through a pad or tampon every hour or two, passing large clots, bleeding longer than seven days, or needing double protection. If that sounds like you, it's worth seeing a doctor.
Most people lose roughly 30–80 ml across a full period, with the heaviest flow in the first couple of days. Exact volume is hard to measure, so changes from your usual pattern matter more than the number.
If you regularly soak through protection hourly, pass large clots, bleed beyond seven days, or feel tired and breathless (possible signs of anaemia), it's worth getting checked.
Hormone fluctuations, stress, missed contraception, and certain conditions can all change flow month to month. Occasional variation is normal; a persistent change is worth discussing with a doctor.