HerSensi tool
Pregnancy Due-Date Estimator
Estimate a due date from the first day of the last menstrual period and usual cycle length.
Pregnancy due-date estimator
Your result
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Nothing is prefilled. Add only the information you are comfortable using in this browser.
Private by defaultThis tool runs in your browser and does not diagnose you. Avoid entering identifying medical information you do not want to use here.
Safety boundary
This estimate does not confirm pregnancy or replace clinical dating and maternity care.
Worked example
What this looks like in real life
A 31-day usual cycle shifts the simple 280-day estimate slightly compared with a 28-day cycle.
The date is useful for orientation, but a clinical dating scan can be more informative about gestational age.
What the tool cannot tell you
Does not confirm pregnancy.
Does not assess pregnancy health.
Urgent pregnancy symptoms should not be routed through a date calculator.
Continue from the result