Free online due date calculator
Due Date Calculator
Pregnancy due date calculator using Naegele’s rule from the last menstrual period.
- Free · No signup
- Instant results
- Private in your browser
- Works on mobile
Result
Estimate due date from the first day of your last menstrual period.
About this due date calculator
Estimate your baby’s due date by adding 280 days to the first day of your last period — the standard Naegele approach.
Use this free online due date calculator when you need a quick, clear estimate without creating an account. Calculations run in your browser on Toolwright, so your inputs stay private. Results are for education and planning — confirm important financial, tax, or health decisions with a qualified professional.
How to use the Due Date Calculator
- Enter the values asked for in the form — amounts, rates, dates, or measurements depending on the tool.
- Tap calculate to see your result instantly. Adjust inputs anytime to compare scenarios.
- Review the breakdown and FAQs below if you want more context on what the numbers mean.
Why people use Toolwright
- Clear answers — dedicated page for the due date calculator, built to load fast and stay easy to read.
- Fast & free — no paywall, no email gate, results above the noise.
- US-ready — copy and units aimed at American and Western users.
- One toolkit — jump to related pregnancy tools without leaving the site.
Due Date Calculator FAQ
Is this medical advice?
No. These calculators provide estimates only. For diagnosis or treatment decisions, consult a qualified clinician.