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Pregnancy Due Date Calculator
Estimate baby due date from last menstrual period and typical cycle length using calendar math.
About Pregnancy Due Date Calculator
Pregnancy Due Date Calculator applies the widely taught last-menstrual-period rule adjusted for cycle length so due-date estimates better match longer or shorter rhythms than twenty-eight days. Outputs include an approximate conception window, weeks elapsed since LMP for journaling, and a trimester label for quick orientation alongside clinical dating.
Why use Pregnancy Due Date Calculator
- Sketch timelines between appointments
- Understand how cycle inputs shift estimates
- Keep calculations offline in the browser
How to use Pregnancy Due Date Calculator
- Enter the first day of your last period
- Set average cycle length if not twenty-eight days
- Tap Calculate to view due date and week counts
When to use Pregnancy Due Date Calculator
- Early pregnancy planning conversations
- Blog or FAQ companion utilities
- Personal milestone tracking
Frequently Asked Questions
Is this medical advice?
No — confirm timing with a qualified clinician and ultrasound dating.
Why adjust for cycle length?
Ovulation timing shifts with cycle length, so adding the same offset for everyone skews long cycles.
Does ultrasound dating override LMP?
Often yes clinically; this tool only reflects LMP-based estimates.
What about irregular cycles?
Estimates are rougher; prefer provider-guided dating.
Are dates stored?
No server upload — inputs stay on your device.