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Ovulation Calculator

Project ovulation days and fertile windows for upcoming cycles from your last period and cycle length.

Cycle details

Counted from day 1 to the next day 1

Next estimated ovulation

Mon, Jun 29, 2026

Fertile window Wed, Jun 24, 2026 – Tue, Jun 30, 2026

Calendar estimates are not contraception. Irregular cycles need extra cues (symptoms, OPKs) or clinical guidance.

Next six cycles

#PeriodOvulationFertile windowNext period
1Mon, Jun 15, 2026 – Fri, Jun 19, 2026Mon, Jun 29, 2026Wed, Jun 24, 2026 – Tue, Jun 30, 2026Mon, Jul 13, 2026
2Mon, Jul 13, 2026 – Fri, Jul 17, 2026Mon, Jul 27, 2026Wed, Jul 22, 2026 – Tue, Jul 28, 2026Mon, Aug 10, 2026
3Mon, Aug 10, 2026 – Fri, Aug 14, 2026Mon, Aug 24, 2026Wed, Aug 19, 2026 – Tue, Aug 25, 2026Mon, Sep 7, 2026
4Mon, Sep 7, 2026 – Fri, Sep 11, 2026Mon, Sep 21, 2026Wed, Sep 16, 2026 – Tue, Sep 22, 2026Mon, Oct 5, 2026
5Mon, Oct 5, 2026 – Fri, Oct 9, 2026Mon, Oct 19, 2026Wed, Oct 14, 2026 – Tue, Oct 20, 2026Mon, Nov 2, 2026
6Mon, Nov 2, 2026 – Fri, Nov 6, 2026Mon, Nov 16, 2026Wed, Nov 11, 2026 – Tue, Nov 17, 2026Mon, Nov 30, 2026

Estimate only — not medical advice

These dates are calendar estimates from average cycle and pregnancy lengths. They are not a diagnosis, not contraception, and not a substitute for clinical care. Talk with a qualified clinician about your situation.

How it works

Enter your inputs in the form. Results update as you change values.

Use the share button when available to copy a link with your current inputs so you can revisit or send the same scenario.

Frequently asked questions

Are these results official advice?
No. Calcuit tools provide estimates for education and planning. Confirm important decisions with a qualified professional.

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