Ovulation Calculator

Ovulation typically occurs 14 days before your next period. For a 28-day cycle, that's around day 14. For a 30-day cycle, around day 16.

The fertile window is about 6 days: the 5 days before ovulation plus the day of ovulation. Sperm can survive up to 5 days, and the egg lives for 12-24 hours after release.

Ovulation calculators provide estimates based on average cycles. For more accuracy, combine with ovulation predictor kits (OPKs), basal body temperature tracking, or cervical mucus monitoring.

The Ovulation Calculator is an online tool that lets you track your fertile window and ovulation date based on your menstrual cycle for family planning. It is part of NexTool's collection of free tools designed to help you work faster and more efficiently.

Using the Ovulation Calculator is simple: visit the tool page, enter your data or input into the provided fields, and get instant results. Follow the controls on the page. Some functions require sign-in or a paid plan; see Pricing for limits.

The Free plan includes 10 tool uses per day. Some features require an account or a paid plan. Check the controls on the tool page and Pricing for the applicable limits.

The Ovulation Calculator returns results based on the inputs and the tool methodology. Check assumptions, units and source dates. Treat projections as estimates. For critical decisions, always consult a qualified professional.

Yes, the Ovulation Calculator is fully responsive and works perfectly on smartphones, tablets, and desktop computers. Simply open NexTool in your mobile browser and navigate to the tool — no app download required.