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Estimate due date, current week & pregnancy milestones.
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Pregnancy Calculator delivers exactly what its name promises, estimate due date, current week & pregnancy milestones, fast and free. Because it belongs to ToolsMonk's medical tools collection, the whole workflow happens on a single page instead of being spread across separate apps or websites.
People reach for it most often when they need estimating a due date from the last period, working out how many weeks pregnant you are, and knowing which trimester you're in. With nothing to install, an unexpected one-off job takes no longer to start than your regular routine.
It is built for getting a real result on the first visit: no learning curve, no account, and the wider ToolsMonk toolbox close at hand.
| Price | Free, no signup, no paywall, no watermark |
|---|---|
| Works on | Any modern browser: desktop, tablet, and mobile |
| Processing | In your browser, files never leave your device |
| Account required | None |
| Category | Medical Tools |
Enter the first day of your last menstrual period
The calculator estimates your due date and current week
See the trimester and key dates
Use it as a planning guide alongside medical care
Estimates your due date and current pregnancy week
Based on your last menstrual period (LMP)
Shows estimated conception date and trimester
A helpful planning estimate
Runs in your browser, your details stay on your device
Free, with no signup and nothing stored
Estimating a due date from the last period
Working out how many weeks pregnant you are
Knowing which trimester you're in
Planning appointments and milestones
Pregnancy Calculator is a free online tool on ToolsMonk with a single focus: estimate due date, current week & pregnancy milestones. Whether you're a professional, student, or casual user, it provides instant, accurate results right in your browser without requiring any software installation or account creation.
All processing runs locally in your browser, so your files and data never leave your device. The interface adapts to any modern browser and screen size, so the Medical Tools workflow you rely on at a desk is the same one you get on a tablet or phone.
Pregnancy Calculator estimates your due date, current week, and trimester from the first day of your last menstrual period (LMP), a quick planning tool for the journey ahead.
It uses the standard Naegele's rule: 280 days (40 weeks) from the LMP. This is also why pregnancy is conventionally counted from the last period rather than conception, the LMP is a known date, whereas the exact moment of conception usually isn't, so gestational age runs about two weeks ahead of actual time since conception, keeping measurement consistent for everyone.
Set expectations on accuracy: the due date is an estimate, with only a small fraction of babies arriving exactly on it and a normal birth occurring anywhere from 37 to 42 weeks. If your cycle differs from 28 days, the LMP-based estimate can be off, and an early ultrasound dating scan is more precise.
Crucially, this is a planning aid, not medical care, always confirm dates and monitor your pregnancy with your doctor or midwife. Your details are processed in your browser and never uploaded. Pair it with the other ToolsMonk health tools for general wellness tracking.
If your cycle isn't ~28 days, expect the LMP estimate to be less precise, a dating scan is more accurate
Remember the due date is an estimate; 37–42 weeks is a normal range for arrival
Use it for planning, but confirm all dates with your doctor or midwife
Common questions about this tool, its workflow, and what to expect before you use it.
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Try itWriting a roundup or tutorial? Embed the live Pregnancy Calculator so readers use it right on your page, or drop in a ready-made card that links to it. Free to use, always.
Preview
Estimate due date, current week & pregnancy milestones.
Use Pregnancy Calculator free →Live tool (iframe)
Readers use the real, working tool right on your page, with a small credit line underneath.
Embed card (HTML)