Free Women’s Health Calculators for Your Cycle & Pregnancy
Our free Women’s Health Calculators help you track your next period and cycle length, estimate ovulation and your fertile days, calculate your pregnancy due date, and check lower-risk days, all in one place, with no sign up required.
Our Free Menstrual Cycle & Pregnancy Calculators
Explore our free tools to estimate your next period, cycle length, ovulation day, fertile days, pregnancy due date, and lower-risk days. Choose the tool that matches what you want to track and get a quick, personalized estimate.
Why Our Women’s Health Calculators Matter
These tools are designed to give you fast and easy estimates on any device. Tracking your dates can help you stay aware of what’s coming up, notice patterns, and better understand how your body works throughout the month, for more on what those patterns can tell you, see our period health guide.
- ✓Estimate when your next period may start so you can plan ahead.
- ✓Get an idea of ovulation timing and your fertile days.
- ✓Calculate your expected due date based on the information you provide.
- ✓Spot changes in your usual monthly pattern that may be worth discussing with a doctor.
How Our Calculators Work
Our Women’s Health Calculators use the details you enter, such as your last period date, average cycle length, or pregnancy dates, to give you personalized estimates. Each one is built for a specific purpose, so browse our calculator guides if you want more detail on how any of them work.
Why Understanding Your Menstrual Cycle Matters
Learning about your menstrual cycle can help you recognize patterns, keep track of important dates, and better understand changes in your body, including how each menstrual cycle phase affects you differently. Knowing the different phases can also help you understand how your body may feel throughout the month.
Tracking gives useful estimates, but your body’s rhythm can naturally vary from person to person, if yours becomes consistently unpredictable, our guide to menstrual cycle irregularities explains when that’s worth discussing with a healthcare professional.
What Is the Menstrual Cycle?
Your menstrual cycle is a natural process that prepares the body for a possible pregnancy. Hormones such as oestrogen, progesterone, FSH, and LH help regulate the different phases. While 28 days is a common average, cycle length can vary from person to person. The Mayo Clinic provides more information about menstrual cycles and what is normal.
The 4 Phases Explained
Want to estimate your own cycle dates? Try our Period Calculator, which also shows your cycle length and phases.
Estimates, Accuracy & Cycle Variations
A cycle is counted from the first day of one period to the first day of the next. Here’s what’s typical, and where our Women’s Health Calculators have their limits.
Cycles can differ from person to person and even from one month to the next. These tools work from the information you enter, so results may not always match what happens in your body, especially if your cycles are irregular or your ovulation timing shifts.
When to Talk to a Healthcare Professional
Our Women’s Health Calculators can help you track dates and understand your menstrual patterns, but they cannot diagnose health conditions. If your periods are consistently irregular, very heavy, painful, repeatedly missed, or significantly different from your usual pattern, it’s best to speak with a qualified healthcare professional.
Helpful Women’s Health Guides
Browse our guides by topic to understand your results and your cycle better.
Frequently Asked Questions
Everything you need to know about our Women’s Health Calculators and tracking your dates