Pregnancy Due Date Calculator — Free, Browser-Based

Enter your last menstrual period date or estimated conception date to instantly calculate your estimated due date, current week and trimester, and key pregnancy milestones. Everything runs locally in your browser — no data is uploaded or stored anywhere.

如何使用此工具

1. Choose whether to calculate from your last menstrual period (LMP) or your conception date, then enter the date.
2. Results appear instantly: your estimated due date, trimester, weeks pregnant, and a full milestone timeline from heartbeat detection to full term.
3. Note your due date and trimester milestones, then confirm the dates with your healthcare provider.