Ovulation Calculator

Estimate your ovulation date, fertile window, and next period date.

First Day of Last Period (day)

Month

Year

Average Cycle Length (days)

Luteal Phase Length (days)

Use Cases

Identify fertile window for family planning
Understand menstrual cycle timing
Track ovulation patterns

Frequently Asked Questions

How accurate is ovulation prediction?

Ovulation calculators provide estimates. Actual timing varies due to cycle irregularity and health factors.

What is the luteal phase?

The luteal phase is the time between ovulation and the next period, typically 12-16 days.

Can stress or illness affect my ovulation date and fertile window timing?

Yes, stress, illness, travel, and significant weight changes can delay ovulation by several days or occasionally skip it entirely in a given cycle.

How can I track ovulation more accurately than using a calculator alone?

Combine calendar tracking with ovulation predictor kits, basal body temperature charting, and cervical mucus observations for the most accurate fertility window identification.

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Disclaimer:

This period/ovulation calculator estimates dates based on the information you provide. It does not guarantee pregnancy, fertility, ovulation timing, or menstrual cycle accuracy and should not be used as birth control.