Menstria · everything menstrual
Your menstrual cycle
and your menstrual period.
Two different things. From the first one to the last.
The period sits inside the cycle. One is an event; the other is the system that produces it. Both get shortened to "menstrual", or to "my period", or to "my cycle" — which is how two people can discuss the same word and mean different things.
Menstria explains each stage in plain language and gives you free tools to check where you actually are. Nothing you enter leaves your browser. Every threshold on this site traces to a named publication.
Get help now — before using anything on this site — if:
- you are soaking through a pad or tampon every hour for two hours in a row;
- you feel faint, dizzy or breathless, or your heart is racing;
- you are pregnant, or might be, and you are bleeding;
- you have any vaginal bleeding at all after menopause.
Start here
Just need to check something? Pick a tool. It runs in your browser and nothing leaves your device.
Is My Cycle Normal?
Work through it by symptoms — no dates needed.
Cycle Length & Regularity
Have your period dates? Score them precisely.
How Heavy Is Heavy?
Estimate blood loss from the products you use.
Period Pain Navigator
Ordinary cramps, or something worth checking?
First Periods Checker
For girls 8–18 — the wider adolescent ranges.
Perimenopause Stage Finder
Name the stage you're in, on the STRAW+10 map.
That's the six people reach for most. See all 15 tools →
Late period, and it might be pregnancy? That's our companion site — hCGcalculator.com, everything about early pregnancy testing.
Read
Short pages, one topic each
The basics
Cycle vs period, why ovulation is everything, what is normal, and what "heavy" means.
5 pages →The first period
When it arrives, what it is like, the first two years, and what needs checking.
6 pages →Perimenopause and menopause
Start tracking at 35, the four stages, symptoms, and the FDA label change.
4 pages →Abnormalities
Every period and cycle problem by its current name, with a searchable glossary.
6 pages →History
From ancient theories of surplus blood to the discovery of progesterone.
8 pages →References
Every number on the site, and the publication it came from.
8 pages →Track from 35
Perimenopause does not begin at 50. Start keeping a record of your period dates at 35.
Not because anything is happening at 35. Because perimenopause is diagnosed from the pattern of your own cycles rather than from a blood test — and in a few years someone will need to know what normal looked like for you. Only you can supply that, and only if you started before you needed it.
Menstria does not diagnose anything. About this site · Built by Amos Grünebaum, MD, part of ObGyn Intelligence.