Ovulation Calculator

Estimate your fertile window and expected ovulation date based on your last period and cycle length.

Last period start date

Average cycle length (days)

Luteal phase length (optional)

Estimated ovulation

Fertile window

Next period (estimate)

Waiting for input...

Notes

Ovulation typically occurs about 14 days before the next period; cycle and luteal lengths vary by individual.
This tool provides estimates only and is not medical advice. Consult healthcare professionals for clinical guidance.
Irregular cycles can reduce accuracy; track several months for better estimates.