Free tool
Migraine frequency calculator
Enter the dates you had a migraine and Temple works out the gaps between them — your shortest, longest, and typical spacing. A single gap tells you little; the pattern across several tells the real story. Everything is calculated locally; the page sends nothing anywhere.
Enter each day you had a migraine (oldest to newest). Everything is calculated on this page — nothing is sent or stored anywhere.
What the numbers mean
One gap vs the pattern. A single gap between two attacks tells you almost nothing on its own — attacks cluster and thin out for all sorts of reasons. The spread across several, from your shortest to your longest, is a much steadier signal. Browse the migraine-days hub to read what a given number of migraine days a month tends to mean.
Episodic and chronic. Fifteen or more headache days a month, for more than three months, is what ICHD-3 calls chronic migraine; fewer is episodic. If your attacks are getting more frequent, it is worth raising with a doctor. The NHS has a clear overview of migraine and when to seek help.
The app does this automatically — every attack you log becomes part of your monthly count, with the episodic-to-chronic line drawn in.