Calculate pregnancy milestones, reverse-engineer the last menstrual period from a due date, and convert dates into weeks with a polished medical-grade interface.
40 weeks
Estimated due date
12 weeks
NT scan window
19 weeks
Morphology scan
Clinical-grade timeline
Forward and reverse pregnancy milestone estimation.
Switch between forward and backward calculations, then use the week converter for precise planning.
Week converter
Use the inputs above to project a date from a pregnancy week count.
Date → Weeks
Select an LMP and a date to calculate.
This shows the pregnancy age on the selected date using standard 7-day week conversion.
Pregnancy Due Date Predictor is a free, browser-based health & lifestyle tool that gives you accurate pregnancy due date and milestone calculator predictor results in seconds — with no account and no data uploaded to any server.
This particular page focuses on the predictor workflow of pregnancy due date and milestone calculator predictor; use it alongside the related tools below to cover adjacent scenarios without switching sites.
Every input you enter is processed locally, so results appear instantly and your figures stay private. Preset examples give you a fast starting point, and the output updates live as you refine your numbers.
Last updated September 2026 · Reviewed by the LoanPay Logic editorial team
Health & Lifestyle