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Pregnancy Due Date Calculator
Estimate your baby's arrival and trimester.
Uses Naegele's rule (last period + 280 days). This is an estimate — only an ultrasound and your doctor can confirm a due date.
Pick the first day of your last period.
About the Due Date Calculator
Free pregnancy due date calculator. Enter the first day of your last period to estimate your due date, current week of pregnancy and trimester.
Everything is calculated instantly in your browser — nothing you type is uploaded or stored. Bookmark Calcooly for the next time you need it.