About My Baby Math

We build free, accurate pregnancy calculators grounded in peer-reviewed medical research — because expecting parents deserve reliable answers.

Our Mission

Pregnancy is a time of profound joy, deep uncertainty, and an endless stream of questions. When is my due date? How far along am I? What milestone should I expect next week? These questions feel urgent, personal, and important — and they deserve accurate answers.

We built My Baby Math because too many online health tools bury results behind paywalls, load pages with intrusive ads before you can see your answer, demand account creation for basic information, or monetize the very health data you trusted them with.

Our mission is simple: give expecting parents fast, accurate, medically-grounded answers — without friction, without surveillance, and without compromises. Every calculator on this site uses formulas sourced from published, peer-reviewed medical literature and authoritative clinical guidelines. We believe that access to reliable health information is a right, not a premium feature.

Who We Are

My Baby Math was created by a small, focused team of software developers and health writers who share a passion for making reliable medical information genuinely accessible. We are not a hospital, a clinic, or a pharmaceutical company. We have no financial relationship with any healthcare provider or medical product.

Our team brings together expertise in software engineering, health communication, and user experience design. We obsess over calculator accuracy, page load speed, and writing that is clear without being condescending.

To ensure the accuracy of our tools and content, we work with qualified medical reviewers who evaluate our calculator logic, formulas, and explanatory content against current clinical standards.

Medical Review: Content reviewed by [Reviewer Name, MD, OB-GYN]. Full reviewer credentials will be published upon engagement. See our Editorial Policy for details on our review process.

Our Commitment to Accuracy

Every calculation formula on this site is sourced from peer-reviewed medical literature and the clinical guidelines published by the American College of Obstetricians and Gynecologists (ACOG). We do not use approximations, round numbers, or folk methods when a validated clinical formula exists.

Specifically, our commitment to accuracy means:

  • Sourced formulas: Every calculator's underlying formula is cited to its primary medical source. You can review those citations directly on each tool page.
  • Medical review: Calculator logic is reviewed by a qualified OB-GYN before publication. Content is reviewed against primary sources by our health writing team.
  • Staying current: When ACOG, the World Health Organization (WHO), or other authoritative bodies update their clinical guidelines, we update our tools. We review all calculators at minimum annually.
  • Transparent limitations: We clearly communicate where estimates are involved, what assumptions our calculators make, and when you should consult your healthcare provider rather than rely on a calculator.

We also publish our full Editorial Policy, which details how content is created, reviewed, and corrected.

Our Commitment to Privacy

Your health data is yours. We take this seriously, especially for pregnancy-related information, which is deeply personal.

  • No data collection from calculators: Every calculation on this site runs entirely in your browser. We never transmit, store, or process the dates, cycle lengths, or other inputs you enter into our tools. When you close the page, that data is gone.
  • No accounts required: You never need to create an account or provide an email address to use any tool on this site.
  • No health data sales: We do not sell, share, or license any personal or health data. We have no data to sell.
  • Anonymous analytics only: We use Google Analytics to understand aggregate traffic patterns — which tools are popular, which pages are slow, which countries visit. This data is anonymous and is used only to improve the site.

For complete details, please read our Privacy Policy.

Our Editorial Process

We follow a rigorous, multi-step process to ensure everything published on this site is accurate, clear, and up to date:

  1. Research: Our health writers begin with primary medical sources — peer-reviewed journals, ACOG Practice Bulletins, WHO guidelines, and CDC data. We do not summarize other health websites.
  2. Drafting: Content is drafted to be accurate, accessible, and free of jargon where possible. When medical terms are necessary, they are explained.
  3. Internal review: Drafts are reviewed by a second team member for clarity, completeness, and factual accuracy against cited sources.
  4. Medical review: All calculator logic and explanatory content is reviewed by a qualified OB-GYN before publication. The reviewer evaluates the clinical accuracy of formulas, the appropriateness of explanations, and any safety-relevant information.
  5. Publication: Pages are published with clear source citations, a last-reviewed date, and links to our medical disclaimer.
  6. Ongoing review: All tool pages are reviewed at minimum once per year. If ACOG or another guideline body updates relevant recommendations, we review and update the affected tools within 30 days.
  7. Corrections: If an error is identified — by our team, a medical reviewer, or a reader — we correct it within 48 hours and note the correction with a date.

See our full Editorial Policy for complete details.

Get in Touch

We'd love to hear from you — whether you've found an error, have a suggestion for a new tool, or simply want to ask a question about how our calculators work.

Visit our Contact page to get in touch. We aim to respond within two business days.

Please note: We are not able to provide personalized medical advice. For any clinical questions, please consult your OB-GYN, midwife, or other healthcare provider.