Pregnancy Calculator — Estimate Due Date Free Online
Estimate your due date and pregnancy week from your last menstrual period date. Free online pregnancy calculator.
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What is Pregnancy Calculator?
A pregnancy calculator estimates your due date and current pregnancy week based on the first day of your last menstrual period (LMP). The standard pregnancy duration is 40 weeks (280 days) from the LMP. This tool provides an estimate — your healthcare provider will confirm your due date with an ultrasound.
How to Use Pregnancy Calculator
- 1Enter the first day of your last menstrual period.
- 2Your estimated due date and current pregnancy week are calculated instantly.
Key Features
- Due date calculation from LMP
- Current pregnancy week and trimester
- Conception date estimate
- Key milestone dates
Benefits
- Plan for your baby's arrival
- Track pregnancy milestones
- Prepare for prenatal appointments
Use Cases
Why Use Irreva for Pregnancy Calculator?
Plan for your baby's arrival
Track pregnancy milestones
Prepare for prenatal appointments
Runs 100% in your browser — files never leave your device.
No account, no sign-up, no subscription — free forever.
Works on any device: desktop, tablet, or mobile.