Pregnancy Due Date Calculator

You need a clear answer from the standard formula — not a spreadsheet rabbit hole. This due date calculator page gives you pregnancy due date calculator without the clutter: estimate a due date from the last menstrual period (LMP) using Naegele’s rule.

When the answer looks wrong

Check units first (percents vs decimals, years vs months, currency as plain numbers). Recalculate after fixing inputs. If your real product compounds or adds fees, switch to the matching calculator that models that behavior.

What Pregnancy Due Date Calculator computes

Enter the fields on the page and read the result lines. The math follows the standard formula for this due date calculator use case. Treat outputs as planning numbers — they omit taxes, fees, or policy rules unless the on-page notes say otherwise.

Where your data goes

Pregnancy Due Date Calculator runs in your browser for this job. Your values is not uploaded to FileToolsHub servers for the conversion itself, which matters when you are dealing with private notes, drafts, or local files.