Cycle Fertile Window Map
How Ovulation Tracking Works (Step-by-Step)
Ovulation calculators estimate peak fertility based on standard luteal phase lengths and menstrual cycle duration:
Luteal Phase Subtraction
Subtract 14 days from your total cycle length, as the luteal phase remains relatively constant prior to menstruation.
Calculating Ovulation Day
Add the resulting day count to the first day of your last menstrual period (LMP) to pinpoint peak ovulation.
Mapping the Fertile Window
Establish a 6-day fertile window spanning 5 days before ovulation plus the ovulation day itself for conception planning.
📊 Benchmark Simulation (28-Day Cycle)
Frequently Asked Questions
How long does an egg survive after ovulation?
An egg is viable for fertilization for approximately 12 to 24 hours after being released.
How long can sperm survive inside the female reproductive tract?
Sperm can survive for up to 5 days under optimal conditions, which creates the 6-day fertile window.
What causes irregular menstrual cycles?
Stress, weight fluctuations, hormonal imbalances, intense exercise, and conditions like PCOS can alter cycle lengths.