About BumpDate

BumpDate is a small set of free calculators for pregnancy date math: your due date by LMP, conception, IVF or ultrasound, and how far along you are. 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.

BumpDate is for planning only. It is not a substitute for prenatal care, and only your provider can confirm your due date and track your baby’s development.