Free tool · Trying to conceive
Due Date & Pregnancy Week Calculator
Estimate your due date and see which week you're in, plus when to start the registry, book classes and pack the hospital bag.
Enter the first day of your last period, a conception date or an IVF transfer date to get an estimated due date and a planning timeline.
Enter a date to see your estimated due date and planning timeline.
Estimate only — talk to your healthcare provider about your due date.
What to do next
Tool
First-Year Cost & Childcare Calculator
Estimate monthly and first-year costs, including childcare where you live.
How it works
The calculator uses the standard 280-day (40-week) estimate from the first day of the last period, adjusted for your cycle length. For IVF it counts from the transfer date and embryo age. Everything is calculated in your browser — nothing you enter is sent anywhere.
Pregnancy week by week
What to plan, buy and book at each stage.
- Week 4
- Week 5
- Week 6
- Week 7
- Week 8Start your pregnancy budget
- Week 9
- Week 10
- Week 11
- Week 12Research childcare waitlists
- Week 13
- Week 14
- Week 15
- Week 16Compare strollers and car seats
- Week 17
- Week 18
- Week 19
- Week 20Create your registry
- Week 21
- Week 22
- Week 23
- Week 24Plan the baby shower
- Week 25
- Week 26
- Week 27
- Week 28Book parenting classes
- Week 29
- Week 30
- Week 31
- Week 32Choose a pediatrician
- Week 33
- Week 34
- Week 35Pack the hospital bag
- Week 36Install the car seat
- Week 37
- Week 38
- Week 39
- Week 40Due date week
- Week 41
- Week 42
Frequently asked questions
How accurate is a due-date estimate?
It's an estimate. Only a small share of babies arrive on their exact due date, so treat it as the middle of a window.
Do you store what I enter?
No. The calculation runs entirely in your browser.