Pregnancy Calculator
Estimate due date and current gestational age from LMP. This free online fitness & health calculator runs entirely in your browser — no signup, no data sent anywhere.
Inputs
Results
How It Works (Formula & Method)
This calculator takes Last Menstrual Period as input and computes Estimated Due Date and Weeks Pregnant. The math runs entirely in your browser the moment you change a value — nothing is sent to a server, and your inputs are never stored.
The formula used is the standard fitness & health calculation for this metric. For a full step-by-step derivation with the default values, see the Worked Example section below.
Worked Example
Frequently Asked Questions
What does the Pregnancy Calculator compute?
The Pregnancy Calculator takes 1 input value and returns 2 results. Estimate due date and current gestational age from LMP.
Is my data sent to a server?
No. The Pregnancy Calculator runs entirely in your browser using static JavaScript. Your inputs are never transmitted to CalculatorHive or any third party, and nothing is stored after you close the page.
Is this calculator free to use?
Yes. Every calculator on CalculatorHive is completely free. There is no signup, no paywall, and no usage limit. The site is supported by display advertising and affiliate partnerships, which are clearly labeled.
Can I rely on this result for medical decisions?
Results are estimates intended for educational use. Health calculations vary with individual factors that a single formula cannot capture. Always consult a qualified clinician for personal health decisions.
Reviewed against: CDC, NIH, and World Health Organization guidance. Results are estimates for educational use only — not medical advice. Consult a qualified clinician for personal health decisions.