Pregnancy Due Date Calculator — Free Online Tool
Due date + week-by-week trimester
Calculate baby due date from last menstrual period or conception date. Week-by-week pregnancy timeline.
Educational tool only. For medical advice, always consult your doctor or midwife.
📚 Learn more
Pregnancy due date calculator
Calculate estimated due date from last period, conception, or IVF transfer.
How to use this tool
- 1
Pick calculation method
LMP (last menstrual period) or conception date.
- 2
Enter date
LMP = Naegele rule (+280 days). Conception = +266 days.
- 3
See timeline
Due date, trimester, current week, milestones.
Frequently Asked Questions
How accurate is a due date?
Pregnancy 101: weeks vs trimesters
Key Takeaways
- Pregnancy Due Date Calculator is a free, browser-based calculator tool — due date + week-by-week trimester.
- No signup, no downloads, no file uploads — your data stays on your device.
- Works on desktop, tablet, and mobile. Install as a PWA for offline access.
How to Use Pregnancy Due Date Calculator
- Open the tool: Launch Pregnancy Due Date Calculator on Toololis — no account or download needed.
- Enter your data: Paste text, enter values, or select a file directly in your browser.
- Get instant results: Everything is processed locally — results appear immediately.
- Copy or download: Save your output or share it. Bookmark for quick access next time.
Pregnancy Due Date Calculator — Quick Facts
- Price
- Free — no limits, no watermarks, no paywalls
- Privacy
- 100% browser-based — no data is sent to any server
- Platform
- Any modern browser on desktop, tablet, or mobile
- Category
- Calculator Tools on Toololis
- Offline
- Works offline after first visit (Progressive Web App)
| Feature | Details |
|---|---|
| Tool | Pregnancy Due Date Calculator |
| Category | Calculator |
| Signup Required | No |
| File Upload | None — processed in browser |
| Mobile Support | Fully responsive |
| Cost | Free forever |
Why Use Pregnancy Due Date Calculator?
You should try Pregnancy Due Date Calculator for a quick, private way to due date + week-by-week trimester. All processing happens in your browser. Your files and data never leave your device. According to web.dev, client-side processing is the gold standard for privacy.
On the other hand, dedicated APIs or desktop tools suit batch processing better. They also handle server-side automation. For everyday tasks, browser tools offer the best speed, privacy, and convenience.