Pregnancy Due Date Calculator
Estimate a due date from the last period, date of conception or a known ultrasound date. Enter your values and press the action button to see the result.
LMP method uses Naegele's rule: LMP + 280 days. Only about 1 in 20 babies arrive on the estimated date — treat it as a range, not a promise.
About Pregnancy Due Date Calculator
Estimate a due date from the last period, date of conception or a known ultrasound date. Press Calculate to see the result in the results panel. Everything runs locally in your browser; nothing is uploaded. Only the current result is shown — no history or side-by-side comparison.
Pregnancy Due Date Calculator reads "Method", "First day of last period", "Date of conception", "Ultrasound date", "Weeks at scan" and "Days at scan" from the form above and writes the answer into the results panel — LMP method uses Naegele's rule: LMP + 280 days. Only about 1 in 20 babies arrive on the estimated date — treat it as a range, not a promise. There is no account, no upload and no server round-trip: the JavaScript on this page does the work on your own device.
How to use Pregnancy Due Date Calculator
- Open Pregnancy Due Date Calculator from Health & Everyday, or find it with the search box in the header.
- Fill in the fields shown above: "Method", "First day of last period", "Date of conception", "Ultrasound date", "Weeks at scan" and "Days at scan".
- Press Calculate. The result replaces whatever was shown before; only the current run is displayed, never two results side by side.
- Use Copy to put the result on your clipboard. A message appears only when something was actually copied.
A worked example
The form opens with these values: Weeks at scan = 8; Days at scan = 0. Press Calculate once to see how the output is laid out, then replace them with your own data and press again — the new result replaces the old one.
Frequently asked questions
Is what I type uploaded anywhere?
No. Pregnancy Due Date Calculator processes "Method", "First day of last period", "Date of conception", "Ultrasound date", "Weeks at scan" and "Days at scan" with JavaScript inside your browser. Your inputs and the result stay on your device; Utilixo keeps no copy of them.
Can I keep several results to compare?
No. Each press of Calculate rebuilds the result from the current inputs and overwrites the previous one. To compare runs, note the earlier result down yourself.
Anything specific to watch with Pregnancy Due Date Calculator?
LMP method uses Naegele's rule: LMP + 280 days. Only about 1 in 20 babies arrive on the estimated date — treat it as a range, not a promise.
How do I take the result away?
Press Copy after a result appears. The copy button only reports success when there is content to copy.
Do I need to sign up or pay?
No. Pregnancy Due Date Calculator is free, needs no registration and has no usage limit. Open the page and use it.
Related tools
- Age Calculator — Your exact age in years, months and days, plus totals down to the minute.
- BMI Calculator — Body mass index in metric or imperial, with the WHO category and a healthy weight range.
- Calorie & TDEE Calculator — BMR with Mifflin-St Jeor, then daily calories to maintain, lose or gain weight.
Further reading
Read the Health & Everyday guide for a longer walkthrough of every tool in this category, with practical examples and tips.