Pregnancy Calculator

Estimate Due date and gestational age from LMP. Educational screening only — not medical advice.

Due Date

Use the fields below, then calculate. Results stay in your browser — for learning only, not medical advice.

Educational context

How this calculator works and what the numbers mean

This tool helps you explore Due Date using widely published formulas and screening ranges. Results are for learning and self-awareness — they are not a diagnosis and do not replace advice from a qualified clinician.

All math runs in your browser on DoseFirst. Results are rounded for display and meant for learning — not for prescribing, dosing medicines, or making treatment decisions on your own.

Formula used:


                                        Due date = LMP + 280 days

Sources & disclaimer

Where the method comes from and how to use results safely

Reference:

Peer-reviewed guidelines and reference equations commonly cited in public health and clinical education.

Educational use only

DoseFirst calculators are for general education and self-screening. They are not medical advice, do not diagnose conditions, and do not replace care from a qualified health professional.