Free tools/PCOS/Period & ovulation predictor
Free tool · 1 minute · Private

Period & ovulation predictor

Your next periods, estimated ovulation and fertile window, with a calendar.

When to get urgent helpSee a doctor or nurse practitioner if your periods stop for 3 months or more (and you are not pregnant), are very heavy (soaking a pad or tampon every 1–2 hours), last more than 7 days, or are very painful. Seek urgent care for heavy bleeding with dizziness or fainting.
Important

This tool gives general information only. It is not a diagnosis or medical advice and does not replace care from your doctor, nurse practitioner, midwife, dietitian or pharmacist. Your answers are calculated in your browser and are never sent to us or stored.

Predictions are estimates. Cycles vary, especially in teens, after pregnancy, with PCOS/PMOS and in perimenopause. This tool must not be used as contraception.

Article · 4 min read

Understanding Your Menstrual Cycle: Periods, Ovulation and Your Fertile Window

What is a normal cycle length, when does ovulation happen and how long is your fertile window? A clear guide to your menstrual cycle and when to get it checked.

Read the article→