Know Your Cycle.
Plan Your Pregnancy.
Free, accurate calculators for ovulation, fertility, and every stage of pregnancy — from your first missed period to your due date. No sign-up, no ads, no guessing.
The Calculators You’ll Use Most
The ones people come back to every cycle.
Estimate ovulation timing from last period date and cycle length.
Estimated due date from your last period, conception, or IVF transfer—plus gestational milestones.
See approximate menstrual phase timing from cycle day and average cycle length.
Calendar-based fertile days from cycle length—for planning awareness.
Estimate a plausible conception date range using your period start and cycle length.
Illustrative window for possible implantation after assumed ovulation.
Whatever Stage You’re In, There’s a Tool for It
Trying to Conceive
Ovulation, fertility window, and conception-date calculators to help you understand your most fertile days.
Pregnant
Due date, gestational age, and weight-gain calculators for every trimester.
Tracking Your Cycle
Period, menstrual phase, and cycle-length calculators to understand your body month to month.
IVF & Fertility Treatment
Due-date and cycle calculators built for the specifics of assisted conception.
The One Site You’ll Actually Bookmark
Zero Ads. Zero Distractions.
No pop-ups, no banners, no cookie walls. Just the calculator you need, instantly.
Built With Accuracy in Mind
Every formula reflects standard clinical methods for cycle and pregnancy dating — verified, not guessed at.
Instant Results
Real-time results as you type. No submit button, no loading screen.
Completely Private
No accounts, no sign-ups, nothing saved or tracked. What you enter stays with you.
Works Everywhere
Fully responsive — use it on your phone in the moment, not just at a desk.
Built for Every Stage of Trying, Expecting, and Tracking
Three Steps. That’s It.
Pick Your Calculator
Ovulation, due date, cycle tracking, and more — organized by what stage you're in.
Enter Your Dates
Your last period, cycle length, or due date — whatever the calculator needs.
Get Your Answer
Clear results with the date range or breakdown you need. No sign-up to see it.
Stop Guessing Your Dates.
One place for ovulation, fertility, and pregnancy tracking — free, private, and accurate every time.