Health Tools
Free, private calculators for your cycle and pregnancy. Everything runs in your browser; nothing you enter is sent or saved.
Ovulation calculator
Estimate the day you are most likely to ovulate and your fertile window, based on the first day of your last period and your average cycle length.
Menstrual cycle calculator
See your current cycle and the next few, with the estimated period start, ovulation day and fertile window for each.
Period calculator
Predict when your next periods are likely to begin, based on the first day of your last period and your average cycle length.
Pregnancy due date calculator
Estimate your due date from the first day of your last menstrual period, using Naegele’s rule (last period plus 280 days).
Frequently asked questions
Are the Evecare health tools free?
Yes. Every calculator is completely free to use and no account or sign-up is required.
Do the calculators store the information I enter?
No. Every calculation runs entirely in your browser. Nothing you enter is sent to a server or saved, and it is erased the moment you leave the page.
How accurate are the calculators?
They provide estimates based on average cycle patterns. Results are for information and education only and are not a substitute for medical advice.
Which calculator should I use?
Use the ovulation calculator to find your fertile window, the period and menstrual cycle calculators to see upcoming period dates, and the pregnancy due date calculator if you are already pregnant.