Pregnancy Due Date Calculator
Calculator ToolsEstimated due date from your last period
Embed this tool on your websiteFree
- Choose how tall the frame should be.
- Press Copy code.
- Paste it into your page, blog, WordPress or Notion HTML block.
The tool runs inside your visitor's browser, nothing is uploaded, and a small "Powered by ToolCloak" line stays under it. The second line (script) is optional: it makes the frame fit the tool's height.
Similar tools you may like
History
All history →Pregnancy Due Date Calculator — at a glance
Estimate your baby’s due date from the first day of your last menstrual period.
How to use it — step by step
The first day of your last period and your usual cycle length.
Enter your values
Fill in the boxes. Sample values are already there so you can see how it works.
Calculate
Press the button to get your answer instantly.
Read the result
The main answer is shown in a large card with extra details below it.
Copy it
Use the copy button to save the result anywhere.
Pro tips
Small things that make the result better.
Quick facts
Frequently Asked Questions
How is the due date calculated?+
Naegele’s rule: add 280 days (40 weeks) to the first day of the last period, adjusted for cycle length.
Is my data safe?+
Yes. Everything runs inside your own browser. Your text, files and images are never uploaded to any server.
Is this tool really free?+
Yes — completely free, no signup, no watermark and no usage limit.