Period Late Calculator
Enter the required values below to run the educational estimation.
Calculating How Late Your Cycle Is
This late period calculator estimates your expected period start date by adding your average cycle length to the first day of your last menstrual period. It then subtracts that date from today's date to show the count of delayed days.
Why Menstrual Cycles Become Delayed
Ovulation timing determines period timing. If ovulation is delayed by stress, illness, or travel, your period will also be delayed. Hormonal conditions like insulin resistance or PCOS can lead to irregular cycles.
When to Take a pregnancy Test
If you are sexually active and your period is even one day late, take a home pregnancy test. If it is negative but your period remains delayed, repeat the test in a week or consult a primary care clinician.
When to Seek Urgent Medical Attention
- Severe abdominal or pelvic pain accompanied by unusual spotting.
- Missed periods for three consecutive months without pregnancy.
- Heavy bleeding that requires changing pads every hour for multiple hours.
Frequently Asked Questions
A period is generally considered late if it does not start within 7 days of the expected date. If it is late by more than 90 days, it is clinically flagged as secondary amenorrhea.
Common causes include acute stress, sudden changes in weight, intense physical training, thyroid imbalances, PCOS, or starting/stopping birth control.
