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Conception Calculator

Highlight peak fertile days across cycles and show the estimated due date if conception happens that month.

Conception window

Counted from day 1 to the next day 1

Peak conception days

Sat, Jun 27, 2026 – Mon, Jun 29, 2026

Wider fertile span Wed, Jun 24, 2026 – Tue, Jun 30, 2026

If conception happens this cycle, due around Mon, Mar 22, 2027

Sperm can remain viable for several days, so the window opens before ovulation. Within that span, the last few days usually carry the strongest odds.

Next six cycles

#PeriodOvulationPeak daysDue if conceived
1Mon, Jun 15, 2026 – Fri, Jun 19, 2026Mon, Jun 29, 2026Sat, Jun 27, 2026 – Mon, Jun 29, 2026Mon, Mar 22, 2027
2Mon, Jul 13, 2026 – Fri, Jul 17, 2026Mon, Jul 27, 2026Sat, Jul 25, 2026 – Mon, Jul 27, 2026Mon, Apr 19, 2027
3Mon, Aug 10, 2026 – Fri, Aug 14, 2026Mon, Aug 24, 2026Sat, Aug 22, 2026 – Mon, Aug 24, 2026Mon, May 17, 2027
4Mon, Sep 7, 2026 – Fri, Sep 11, 2026Mon, Sep 21, 2026Sat, Sep 19, 2026 – Mon, Sep 21, 2026Mon, Jun 14, 2027
5Mon, Oct 5, 2026 – Fri, Oct 9, 2026Mon, Oct 19, 2026Sat, Oct 17, 2026 – Mon, Oct 19, 2026Mon, Jul 12, 2027
6Mon, Nov 2, 2026 – Fri, Nov 6, 2026Mon, Nov 16, 2026Sat, Nov 14, 2026 – Mon, Nov 16, 2026Mon, Aug 9, 2027

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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