Pregnancy Due Date Calculator estimates a due date and pregnancy week from the first day of the last menstrual period (LMP) using a common calendar rule.
Enter the LMP date to get a planning estimate for appointments, leave discussions, and personal calendars while you wait for clinical dating.
Output is informational and not medical advice. Ultrasound dating and clinician guidance override this estimate whenever they differ.
What Pregnancy Due Date Calculator does
It applies an LMP-based due date estimate and related pregnancy timing.
- First day of last period (LMP) date field
- Estimate due date action
- Result oriented to due date and week context
- UI hint to confirm with a clinician
Who Pregnancy Due Date Calculator is for
- Expectant parents preparing a first prenatal visit
- Partners helping track weeks for planning
- Doulas sketching timelines before records arrive
- Anyone learning how LMP dating roughly works
How to use Pregnancy Due Date Calculator
1. Enter the First day of last period (LMP).
2. Press Estimate due date.
3. Read the estimated due date and related week information.
4. Bring the result to a clinician for confirmation rather than treating it as final.
Features
- LMP-focused dating form
- Due date estimate without account creation
- Client-side calendar math for private dates
- Clear informational disclaimer in the interface
- Related day-span tools for appointment gaps
- Stable /tools/pregnancy-due-date/ URL
Examples
- LMP on a known calendar day to sketch a third-trimester window.
- Compare the estimate with an early clinic letter once available.
- Use the week context to time a work leave conversation.
- Recalculate if the remembered LMP day was corrected later.
Tips and limits
- Irregular cycles make LMP dating less reliable; ask a clinician early.
- IVF and other assisted timelines use different dating methods.
- This tool does not diagnose pregnancy or complications.
- Always follow medical advice over a web estimate.
Related tools
- Days Between Dates Count days between prenatal appointments or leave dates.
- Age Calculator Compute exact ages for family records unrelated to gestation dating.
FAQ
Is Pregnancy Due Date Calculator free?
Estimate dates on BeeForge without a paid app subscription. No account is required to try the LMP form.
Is my LMP date private?
Dating math runs in the browser. Prefer a personal device for health-related dates.
Can I use it on a phone?
Yes. Confirm the year on the date control; scrolling can jump years accidentally.
What if the clinic due date differs?
Trust the clinical dating method your provider uses. This page is only an LMP-based estimate.
May I link this from a parenting resource?
Link /tools/pregnancy-due-date/ with a visible note to confirm results with a clinician.