from the first test
to the first birthday.

When is the baby due? How far along am I? When am I most fertile? These questions have clear answers, and our tools work them out with the same formulas your provider uses.

Start with your due date

The due date calculator is usually the first stop. It uses Naegele’s rule, endorsed by ACOG: your last period plus 280 days. You can also start from a conception date or an IVF transfer. Only about 1 in 20 babies arrives on the exact date, so treat it as the middle of a window, not a deadline.

Know how far along you are

Once you have a due date, the how many weeks pregnant calculator shows your week, trimester, and what’s happening now. The weight gain calculator gives a healthy range for your BMI per IOM/NASEM guidelines, and the maternity leave planner turns FMLA and your state’s paid-leave rules into a real timeline.

Trying to conceive

The ovulation calculator estimates your fertile window from your last period and cycle length. The window is six days: the five before ovulation plus the day itself, with the best odds one to two days before.

Once baby arrives

The growth percentile calculator plots weight, length, and head size on WHO curves. The feeding calculator gives AAP-based daily amounts, the sleep schedule generator suggests nap times and bedtime, the diaper cost calculator sizes up your monthly spend, and the baby name explorer helps you find a name with meaning.

About Sage & Sprout. Our tools are built on primary medical literature (ACOG, AAP, NIH, CDC) and reviewed by a senior US medical student at an Ivy League institution. Every calculation runs in your browser. We never store your dates or personal information. This is general educational information, not a substitute for your own provider. Learn more →