TechTools

Ovulation & Fertility Calculator

21 days28 days (avg)35 days

Enter your LMP date to see your ovulation calendar

Educational Disclaimer

This calculator is for informational and educational purposes only. Ovulation timing varies between individuals and cycles. This tool should not be used as a contraceptive method or to replace professional medical advice.

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Estimate ovulation and fertile window from LMP and cycle length (21-35 days). Shows next 3 cycles with color-coded days: menstruation, fertile window, ovulation.

How to Use

  1. 1Enter your last menstrual period (LMP) start date
  2. 2Select your average cycle length (21–35 days, default 28)
  3. 3Click Calculate to see ovulation date and fertile window for the next 3 cycles
  4. 4Color-coded calendar shows menstruation, fertile window, and ovulation days
  5. 5This is an estimate based on average cycle data - for accuracy, use basal temperature tracking or LH tests

Features

  • LMP + cycle length (21–35 days) input
  • Ovulation date: cycle day (length − 14)
  • Fertile window: 5 days before + ovulation + 1 day after
  • Next 3 cycles displayed
  • Color-coded calendar: menstruation / fertile / ovulation
  • Educational disclaimer included
  • 100% browser-based

Frequently Asked Questions

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