What this estimates
Gestational age, trimester, and estimated due date from the entered LMP date using typical dating assumptions.
Estimate-only calculatorBrowser date calculation
How many weeks pregnant am I?
Estimate gestational age, trimester, and an estimated due date from the first day of your last menstrual period.
This public calculator gives estimates only. It does not confirm pregnancy, diagnose, monitor, triage, assess fetal health, predict complications, or replace clinician dating scans or care.
What it does not do
It does not confirm pregnancy, determine conception with certainty, assess fetal health, monitor symptoms, triage concerns, or predict complications.
When to seek care
Use your clinician's instructions for symptoms, movement, appointments, medication, tests, or care plans. Seek urgent real-world help for concerning symptoms.
Keep weekly context wellness-only.
Mom's Bloom is a mobile pregnancy wellness and organization app for adults. AI-supported reflections are informational only and may be wrong or incomplete.
Important estimate-only notice
This calculator provides an estimate only based on the first day of your last menstrual period and typical dating assumptions. It is for informational wellness support and does not replace professional medical advice, diagnosis, treatment, monitoring, or emergency care.
Frequently asked questions
How is gestational age estimated?
This calculator counts from the first day of the last menstrual period, a common dating assumption for pregnancy estimates. A clinician may adjust dates using ultrasound, cycle history, clinical context, or other information.
Can this calculator confirm pregnancy or fetal health?
No. It does not confirm pregnancy, assess fetal health, predict complications, triage symptoms, monitor pregnancy, or decide whether something is safe.
Do I need to sign up to use it?
No sign-up is required for this public calculator. The LMP estimate runs in the browser for the date you enter, but that is not a broader promise about website analytics or data collection.
What if I do not remember my LMP?
If you do not know the exact date, ask a healthcare professional about the best way to estimate dating. Do not use this calculator as a substitute for clinician guidance.
What are the trimester boundaries used here?
This calculator labels weeks 0-13 as first trimester, weeks 14-26 as second trimester, and week 27 onward as third trimester for estimate display only.
Privacy, health-data, and AI-safety context
Pregnancy-related dates can be sensitive. Review the Mom's Bloom public notices for how the mobile app and public pages describe health-data handling, privacy boundaries, and AI/medical limitations.