About MamArc

What we believe

Your dates are yours

The math runs on your phone. We never see your pregnancy dates. When you share a family page, the dates travel inside the link, so only the people you send it to can see them.

Show the math

Every result explains how it was calculated, with links to official sources such as ACOG, the NHS and the WHO. See how we calculate.

A range, not a promise

A due date is an estimate. We always show the range when babies really arrive, and we tell you when to talk to your doctor or midwife.

For the whole family

Pregnancy is shared: partners, grandparents and big brothers and sisters all wait for the baby. Our tools help everyone feel included.

How we keep it free

The site is free and has no accounts. It is paid for by up to two calm ads on some pages (never on sensitive pages, never inside a tool) and by optional tips. We never sell data.

Always name our sources

Every medical fact links to an official source. Read our sources and how we check facts and our editorial policy. Found a mistake? Tell us.