Your baby awaits. Count down every single day.
Free, private tools for the whole wait — due date and ovulation calculators, a week-by-week guide, a contraction timer for the big day. No account. No app. No data collection.
Everything is calculated on your device — nothing is uploaded.
Tools for every stage of the wait
Simple, beautifully clear calculators built on the same formulas your provider uses.
Due Date Calculator
Naegele's rule with your cycle length — plus conception and IVF options, and a personal countdown.
Open tool →Ovulation Calculator
Find your fertile window and next predicted ovulation dates, with a peek at the due date each cycle would bring.
Open tool →Week by Week Guide
All 40 weeks: baby's size with fruit comparisons, what you may feel, and one gentle tip a day's reading deserves.
Open tool →Contraction Timer
One giant button for the big day. Tracks duration and spacing so you can watch for the 5-1-1 pattern.
Open tool →Weight Gain Guide
Personal IOM ranges by your pre-pregnancy BMI, with a pace check at every week of pregnancy.
Open tool →How We Calculate
The exact formulas, data sources and limits behind every number on this site — in plain English.
Open tool →Private by design
Pregnancy is personal. Here is how we treat it.
Nothing leaves your device
Calculations run in your browser. Your dates live in your device's own storage and nowhere else.
Standard obstetric math
Naegele's rule, IOM weight ranges, CDC-based growth references — the same formulas used across US maternity care.
Free, forever
No accounts, no premium tiers, no app store. Advertising keeps the lights on — that's the whole business model.
Questions people ask
How does the due date calculator work?
It uses Naegele's rule — the standard obstetric formula — counting 280 days from the first day of your last period, with an adjustment if your cycle is longer or shorter than 28 days. You can also calculate from conception or an IVF transfer date.
Is my information private?
Completely. Every calculation runs in your browser, and the dates you enter are stored only on your own device using localStorage. Nothing is transmitted to any server.
How big is the baby each week?
Our week-by-week guide follows the baby's average size with a familiar fruit or vegetable comparison each week — from poppy seed at week 4 to small pumpkin at week 40, with measurements in inches and centimeters.
When should I head to the hospital?
A common guide is the 5-1-1 pattern: contractions 5 minutes apart, each lasting about 1 minute, for 1 hour. Your provider may give you a different threshold — always follow their guidance.