Free period tools

Calculators and checklists for first periods — wide windows, kid-sized language, and no fertility charts.

When is the next period?

A date window from the last start, with extra room when cycles are still new.

When do periods start?

Pick an age from 8 to 16. Most first periods land between 9 and 15.

First period kit

Pads, a liner, spare underwear, and a zip pouch. Check them off as you pack.

Guides

Short articles, sorted by who is reading. The full list lives on the blog.

For teens and tweens

For parents

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