Pregnancy & baby tools
from the first test
to the first birthday.
Free, science-backed calculators for trying to conceive, pregnancy, and your baby’s first years — accurate, ad-light, and reviewed by a senior medical student. No sign-up. Nothing stored.
The toolkit
Ten calm tools, one quiet place.
Conceiving, expecting, or holding a newborn — pick where you are. Every result is personal to you and shareable with a link.
A quick guide
Pregnancy calculators, explained for real people
When you’re pregnant — or hoping to be — the numbers carry weight. When is the baby due? How far along am I, really? When am I most fertile? These questions have clear, evidence-based answers, and our tools work them out with the same formulas your provider uses. No jargon, no account, no watching your data leave your phone.
Start with your due date
The due date calculator is almost always the first tool parents reach for. It uses Naegele’s rule — endorsed by the American College of Obstetricians and Gynecologists (ACOG) — to add 280 days to the first day of your last period. You can also work from a known conception date or an IVF transfer. Only about 1 in 20 babies actually arrives on the estimated date; it’s 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 gestational age in weeks and days, your trimester, and what’s happening this week. The pregnancy weight gain calculator gives a healthy range based on your pre-pregnancy 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
If you’re trying to get pregnant, the ovulation calculator estimates your fertile window from your cycle length and last period. The window spans six days — the five before ovulation plus the day itself — with the best odds one to two days before.
Once baby arrives
After birth, 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 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 →