Your journey.
Our guidance.
Free pregnancy calculators and week-by-week guides — built with sourced clinical information, designed to support you at every step.
Pregnancy Calculators
Fast, accurate tools that run in your browser. We never store your dates or personal information.
Gestational Age Calculator
How many weeks and days pregnant are you? From LMP, due date, or ultrasound.
How Many Weeks Pregnant
Same calculation, conversational framing. Understand the dating method.
Trimester Calculator
Which trimester are you in? ACOG boundaries and milestone placement.
Conception Date Calculator
Estimated conception window and fertile window from LMP or due date.
Pregnancy Milestone Dates
Dated list of key milestones — scans, quickening, viability, term dates.
Due Date Calculator
Four modes: LMP, conception, IVF transfer, or ultrasound dating.
Pregnancy Guides
Expert-reviewed guides covering every trimester, symptom, and milestone.
First Trimester
What to expect in weeks 1-13 — symptoms, development, and screening tests.
Second Trimester
Movement, energy, and the anatomy scan — weeks 14-27.
Third Trimester
Preparing for birth, monitoring, and term definitions — weeks 28-40+.
Prenatal Vitamins
Folic acid, iron, DHA, calcium, and what to look for in a prenatal vitamin.
Pregnancy Weight Gain
Healthy weight gain by BMI, trimester breakdown, and practical tips.
Fetal Development
Week-by-week development from embryo to fetus to full term.
Pregnancy Week by Week
What happens to your body and baby at each stage of pregnancy.
Gestational Age Explained
What gestational age means and why it counts from your last period.
Due Date Explained
How your due date is calculated and how accurate it really is.
Pregnancy Test Timing
When to take a pregnancy test for the most accurate result.
Why Bump Compass?
Built with care, sourced with integrity.
Sourced Content
Every clinical claim is cited to ACOG, NICHD, Mayo Clinic, or NHS. Where authorities disagree, we show the range and name each source.
Privacy First
Every tool runs in your browser. We do not store your dates, your inputs, or any personal information.
Honest Limits
We say "the authorities disagree" or "there is no single definition" rather than give you a confident number that is wrong for your situation.