What is Period & Ovulation Calculator?
Enter the first day of your last period, your average cycle length and period length to calculate your next period, ovulation day (14 days before the next period) and fertile window (5 days before to 1 day after ovulation), with the next 6 cycles in a table.
How to use
- 1
Pick the first day of your last period.
- 2
Enter your average cycle and period length.
- 3
Check your next period and fertile window.
Use cases
Travel plans
Check whether your period overlaps with a trip.
Trying to conceive
See your ovulation day and fertile window ahead of time.
FAQ
Is the information I enter saved?+
No. All calculations happen in your browser and nothing is stored or sent anywhere.