About BumpDate

BumpDate is a small independent project that builds free calculators for pregnancy date math: your due date by LMP, conception, IVF or ultrasound, how far along you are, and a week-by-week view. Every tool runs in your browser, so the dates you type never leave your device.

We built BumpDate because due-date arithmetic is easy to get wrong by hand. Our tools use standard methods — Naegele's rule (LMP + 280 days) and common IVF conventions (transfer date + 260–263 days) — so the estimate matches what you would get from a typical due-date wheel or clinic software.

The site is maintained by a small team with help from a practicing nurse who reviews the medical wording. We are not a clinic and we do not provide medical care; we make planning tools, and your provider confirms the official dates.

BumpDate collects no personal data. There are no accounts, no uploaded files, and no advertising trackers that follow you across the web. If advertising is ever enabled, it uses standard network cookies that you can control in your browser settings (see our Privacy Policy).

Our goal is simple: give expecting parents a fast, private way to estimate dates and track progress, without signing up for anything or handing over personal information. The medical wording on the site is reviewed by a registered prenatal nurse so the explanations stay clear and responsible. If you spot a mistake in the wording or the math, email us and we will fix it.