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A quick way to understand who this helps, what it solves, and where it connects next.
Expecting parents estimating pregnancy dates.
Using the pregnancy due date calculator without installing anything or signing up.
Capture pregnancy-calculator intent with a fast, browser-side tool that runs 100% locally.
Cleanor Labs
These sections explain the job in plain language and set expectations for what the tool should do well.
The Pregnancy Due Date Calculator estimates your due date from the first day of your last menstrual period using Naegele's rule (280 days), adjusted for your average cycle length. It also shows your current gestational age in weeks and days, your trimester, and a timeline of key milestones from estimated conception through full term. Everything is calculated locally in your browser, so no dates are uploaded. This is an estimate for general information only and is not medical advice; always confirm dates with your doctor or midwife.
Short answers for the questions people usually have before trying a utility like this.
It uses Naegele's rule, adding 280 days to the first day of your last period, then shifting by the difference between your cycle length and 28 days so longer or shorter cycles are accounted for.
No. Only about 1 in 20 babies arrive on the estimated due date. It is a helpful estimate for planning, not a guarantee, and an ultrasound dating scan is more precise.
Yes. All calculations run entirely in your browser and nothing you enter is uploaded or stored on a server.
Every tool on Cleanor is free with no sign-up, no credits, and no limits. Files are processed privately in your browser. Looking for on-device phone cleanup and Premium features? That lives in the Cleanor app.
Enter the first day of your last period to estimate your due date, current week, and key milestones. Everything is calculated locally in your browser.
This is an estimate for general information only and is not medical advice. Confirm dates with your doctor or midwife.
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