PeriodVol is a privacy-first period tracker that estimates how much you actually bleed — in millilitres — each day and across your whole cycle, and flags the clinical 80 ml heavy-bleeding threshold.
Open PeriodVolI made this app because of a question I couldn't answer.
I was low on iron — low enough to need an infusion. Before the haematologist would give it to me, she asked something simple: “Are your periods heavy?” And I realised I had no idea. A lot? A little? I'd had periods my whole life and genuinely couldn't say. I had nothing to show her but a shrug.
That's the strange thing about periods: we're told to track the dates, but never how much. Yet “how much” is the part that actually signals your health — it's the reason I was sitting in that chair.
So I built PeriodVol: log what you use and it estimates how much you actually bleed, in millilitres, each day and across your cycle. It marks the 80 ml point doctors consider heavy, and tracks clots and how often you change — so next time the answer isn't a shrug, it's a number. And because this is the most personal data there is, none of it ever leaves your phone. No account, no servers, nothing to sell.
I can't promise an app changes an outcome. But no one should have to guess about their own body. That's why I made it. 💛
Most period apps only record dates. PeriodVol estimates your flow volume in millilitres, because how much you bleed is what actually matters for spotting heavy menstrual bleeding (HMB) and understanding your body.
How much you bleed is a window into your health — yet most people never measure it. A normal period is about 30–80 ml of blood per cycle (roughly 2–5 tablespoons). Tracking the volume helps you notice changes early and gives your doctor real numbers instead of a guess.
PeriodVol isn't a diagnosis — it helps you spot when something has changed so you can talk to a healthcare professional. If your volume is consistently over 80 ml, changes suddenly, or comes with severe pain or signs of anemia, see a doctor.
A typical period is about 30–40 ml of blood over the cycle, and up to 80 ml is considered normal. More than 80 ml per cycle is defined as heavy menstrual bleeding (HMB). Other signs of heavy bleeding include soaking a pad or tampon every two hours or less, passing large clots, or bleeding for more than seven days. PeriodVol is not a medical device — if your volume is high or something feels off, talk to a healthcare professional.
A menstrual cup is the most accurate way to measure, because you read the volume directly from its markings. With pads and tampons you can only estimate — as a guide, a fully soaked regular pad or tampon holds about 5 ml (a teaspoon), and a soaked overnight pad about 10–15 ml. PeriodVol turns your product logs into an estimated millilitre total automatically; the exact value used for every product and saturation level is published in our methodology. Prefer a chart? See our guide to the PBAC and menstrual blood loss charts and how clot size is defined.
About 30–40 ml over the whole cycle is typical, and up to 80 ml is normal. More than 80 ml per cycle is heavy menstrual bleeding.
More than 80 ml of blood loss in one cycle — or soaking a product every ≤2 hours, large clots, night changes, or bleeding over 7 days. PeriodVol flags when a cycle passes 80 ml.
A menstrual cup is the most accurate (read the markings). With pads/tampons, PeriodVol estimates the volume from the product and how soaked it is.
A fully soaked regular pad or tampon holds roughly 5 ml (a teaspoon); a soaked overnight pad about 10–15 ml. ~16 soaked normal products in a cycle ≈ the 80 ml threshold.
No account and no server — everything stays on your device. No ads or trackers; optional PIN / Face ID lock; export or delete anytime.
It's stored only on your current phone — never on a server — so it doesn't transfer automatically. In Settings, tap Backup to save a file, then Import it on the new phone. You move it yourself, which is what keeps it private.
Yes — free on the web and as an iOS and Android app, no account required.
Yes, after a few logged cycles — as estimates on the calendar. They may be inaccurate and must not be used as contraception.
How much you bleed can signal your health. Consistently heavy periods (over 80 ml) can cause iron-deficiency anemia and may point to conditions like fibroids or adenomyosis; very light or sudden changes can be linked to hormonal issues. Tracking it lets you catch changes early and see a doctor with real numbers.
Heavy menstrual bleeding (over 80 ml per cycle) can lead to anemia and fatigue and can be a sign of uterine fibroids, adenomyosis, or changes in the uterine lining. Soaking a pad or tampon every 1–2 hours, overnight changes, or large clots are worth discussing with a doctor.
The figures on this page — the 30–80 ml normal range, the 80 ml heavy-bleeding (HMB) threshold, and the per-product millilitre estimates — are drawn from the clinical literature below. PeriodVol is not a medical device; these are references for the numbers, not medical advice.
Want the whole method? How PeriodVol estimates menstrual blood loss publishes every per-product millilitre value the app uses, the evidence behind each one, the limitations of the approach, and the time we corrected our own numbers downwards after getting them wrong.