Free planning tool

Period Date & Cycle Guide

Estimate when your next period may start — privately in your browser, without an account.

No login. No storage. Calculated on your device.

Educational planning only — not medical advice, diagnosis, or contraception guidance.

Day 1 is the first day of proper bleeding, not light spotting.

Usual cycle length
28days

Most cycles fall between 21 and 35 days. Average is often around 28.

How regular are your cycles?

Common questions

Is this period calculator accurate?

It provides an educational estimate based on your last period start date and usual cycle length. Cycles vary, so treat the result as a planning range — not a guarantee.

Do you store my period date?

No. The estimate is calculated in your browser. We do not require an account and we do not put your period date in the URL.

Can I use this for contraception or fertility?

No. This tool must not be used to prevent pregnancy or identify fertile or safe days.