Pregnancy Due Date Calculator
Estimate your due date from your last period and cycle length.
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Pregnancy due date calculator guide for UK parents
WeCovr's pregnancy due date calculator helps UK parents estimate a due date from last period and cycle length, supported by FCA-authorised guidance and 900,000+ policies issued across protection products. It is a planning tool, not medical advice.
What this due date calculator estimates
The calculator estimates a due date using the first day of your last period and your average cycle length. It also shows gestational age and trimester milestones.
Dates are estimates only. Always follow guidance from your midwife or healthcare professional.
Based on standard 280-day pregnancy length.
Adjusts for your cycle length.
Provides trimester end dates.
Why dates can change
Due dates can shift after early scans or clinical assessments, and cycle lengths can vary month to month.
Why WeCovr supports family planning
WeCovr provides FCA-authorised guidance with high customer satisfaction ratings. We also offer complimentary access to the CalorieHero AI calorie tracking app and discounts when customers take PMI or Life insurance.
Data sources and guidance references
This guide references NHS pregnancy guidance and standard obstetric dating conventions.
Pregnancy timeline milestones
| Milestone | Typical timing | Why it matters | Next step |
|---|---|---|---|
| Trimester 1 end | 13 weeks | Key early development | Book routine checks |
| Trimester 2 end | 27 weeks | Growth phase | Prepare for birth planning |
| Due date | 40 weeks | Estimated arrival | Pack and plan |
Related WeCovr resources
FAQs
Is this due date guaranteed?
No. It is an estimate based on cycle information and can change after clinical assessments.
What if my cycle length varies?
Use your best average. Irregular cycles can reduce accuracy, so consult a healthcare professional.
How is gestational age calculated?
It is typically calculated from the first day of your last menstrual period.
Should I rely on this calculator for medical decisions?
No. Always follow guidance from your midwife or doctor.